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1339 lines
49 KiB
C
Executable File
1339 lines
49 KiB
C
Executable File
/*
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* Windows Media Audio Lossless decoder
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* Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
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* Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson
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* Copyright (c) 2011 Andreas Öman
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* Copyright (c) 2011 - 2012 Mashiat Sarker Shakkhar
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "libavutil/attributes.h"
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#include "libavutil/avassert.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "get_bits.h"
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#include "put_bits.h"
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#include "lossless_audiodsp.h"
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#include "wma.h"
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#include "wma_common.h"
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/** current decoder limitations */
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#define WMALL_MAX_CHANNELS 8 ///< max number of handled channels
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#define MAX_SUBFRAMES 32 ///< max number of subframes per channel
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#define MAX_BANDS 29 ///< max number of scale factor bands
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#define MAX_FRAMESIZE 32768 ///< maximum compressed frame size
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#define MAX_ORDER 256
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#define WMALL_BLOCK_MIN_BITS 6 ///< log2 of min block size
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#define WMALL_BLOCK_MAX_BITS 14 ///< log2 of max block size
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#define WMALL_BLOCK_MAX_SIZE (1 << WMALL_BLOCK_MAX_BITS) ///< maximum block size
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#define WMALL_BLOCK_SIZES (WMALL_BLOCK_MAX_BITS - WMALL_BLOCK_MIN_BITS + 1) ///< possible block sizes
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#define WMALL_COEFF_PAD_SIZE 16 ///< pad coef buffers with 0 for use with SIMD
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/**
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* @brief frame-specific decoder context for a single channel
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*/
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typedef struct WmallChannelCtx {
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int16_t prev_block_len; ///< length of the previous block
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uint8_t transmit_coefs;
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uint8_t num_subframes;
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uint16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
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uint16_t subframe_offsets[MAX_SUBFRAMES]; ///< subframe positions in the current frame
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uint8_t cur_subframe; ///< current subframe number
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uint16_t decoded_samples; ///< number of already processed samples
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int quant_step; ///< quantization step for the current subframe
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int transient_counter; ///< number of transient samples from the beginning of the transient zone
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} WmallChannelCtx;
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/**
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* @brief main decoder context
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*/
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typedef struct WmallDecodeCtx {
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/* generic decoder variables */
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AVCodecContext *avctx;
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AVFrame *frame;
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LLAudDSPContext dsp; ///< accelerated DSP functions
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uint8_t *frame_data; ///< compressed frame data
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int max_frame_size; ///< max bitstream size
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PutBitContext pb; ///< context for filling the frame_data buffer
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/* frame size dependent frame information (set during initialization) */
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uint32_t decode_flags; ///< used compression features
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int len_prefix; ///< frame is prefixed with its length
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int dynamic_range_compression; ///< frame contains DRC data
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uint8_t bits_per_sample; ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0])
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uint16_t samples_per_frame; ///< number of samples to output
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uint16_t log2_frame_size;
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int8_t num_channels; ///< number of channels in the stream (same as AVCodecContext.num_channels)
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int8_t lfe_channel; ///< lfe channel index
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uint8_t max_num_subframes;
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uint8_t subframe_len_bits; ///< number of bits used for the subframe length
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uint8_t max_subframe_len_bit; ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1
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uint16_t min_samples_per_subframe;
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/* packet decode state */
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GetBitContext pgb; ///< bitstream reader context for the packet
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int next_packet_start; ///< start offset of the next WMA packet in the demuxer packet
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uint8_t packet_offset; ///< offset to the frame in the packet
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uint8_t packet_sequence_number; ///< current packet number
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int num_saved_bits; ///< saved number of bits
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int frame_offset; ///< frame offset in the bit reservoir
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int subframe_offset; ///< subframe offset in the bit reservoir
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uint8_t packet_loss; ///< set in case of bitstream error
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uint8_t packet_done; ///< set when a packet is fully decoded
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/* frame decode state */
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uint32_t frame_num; ///< current frame number (not used for decoding)
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GetBitContext gb; ///< bitstream reader context
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int buf_bit_size; ///< buffer size in bits
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int16_t *samples_16[WMALL_MAX_CHANNELS]; ///< current sample buffer pointer (16-bit)
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int32_t *samples_32[WMALL_MAX_CHANNELS]; ///< current sample buffer pointer (24-bit)
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uint8_t drc_gain; ///< gain for the DRC tool
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int8_t skip_frame; ///< skip output step
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int8_t parsed_all_subframes; ///< all subframes decoded?
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/* subframe/block decode state */
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int16_t subframe_len; ///< current subframe length
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int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe
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int8_t channel_indexes_for_cur_subframe[WMALL_MAX_CHANNELS];
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WmallChannelCtx channel[WMALL_MAX_CHANNELS]; ///< per channel data
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// WMA Lossless-specific
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uint8_t do_arith_coding;
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uint8_t do_ac_filter;
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uint8_t do_inter_ch_decorr;
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uint8_t do_mclms;
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uint8_t do_lpc;
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int8_t acfilter_order;
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int8_t acfilter_scaling;
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int16_t acfilter_coeffs[16];
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int acfilter_prevvalues[WMALL_MAX_CHANNELS][16];
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int8_t mclms_order;
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int8_t mclms_scaling;
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int16_t mclms_coeffs[WMALL_MAX_CHANNELS * WMALL_MAX_CHANNELS * 32];
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int16_t mclms_coeffs_cur[WMALL_MAX_CHANNELS * WMALL_MAX_CHANNELS];
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int32_t mclms_prevvalues[WMALL_MAX_CHANNELS * 2 * 32];
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int32_t mclms_updates[WMALL_MAX_CHANNELS * 2 * 32];
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int mclms_recent;
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int movave_scaling;
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int quant_stepsize;
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struct {
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int order;
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int scaling;
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int coefsend;
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int bitsend;
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DECLARE_ALIGNED(16, int16_t, coefs)[MAX_ORDER + WMALL_COEFF_PAD_SIZE/sizeof(int16_t)];
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DECLARE_ALIGNED(16, int32_t, lms_prevvalues)[MAX_ORDER * 2 + WMALL_COEFF_PAD_SIZE/sizeof(int16_t)];
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DECLARE_ALIGNED(16, int16_t, lms_updates)[MAX_ORDER * 2 + WMALL_COEFF_PAD_SIZE/sizeof(int16_t)];
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int recent;
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} cdlms[WMALL_MAX_CHANNELS][9];
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int cdlms_ttl[WMALL_MAX_CHANNELS];
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int bV3RTM;
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int is_channel_coded[WMALL_MAX_CHANNELS];
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int update_speed[WMALL_MAX_CHANNELS];
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int transient[WMALL_MAX_CHANNELS];
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int transient_pos[WMALL_MAX_CHANNELS];
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int seekable_tile;
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unsigned ave_sum[WMALL_MAX_CHANNELS];
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int channel_residues[WMALL_MAX_CHANNELS][WMALL_BLOCK_MAX_SIZE];
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int lpc_coefs[WMALL_MAX_CHANNELS][40];
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int lpc_order;
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int lpc_scaling;
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int lpc_intbits;
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} WmallDecodeCtx;
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/** Get sign of integer (1 for positive, -1 for negative and 0 for zero) */
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#define WMASIGN(x) (((x) > 0) - ((x) < 0))
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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WmallDecodeCtx *s = avctx->priv_data;
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uint8_t *edata_ptr = avctx->extradata;
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unsigned int channel_mask;
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int i, log2_max_num_subframes;
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if (avctx->block_align <= 0 || avctx->block_align > (1<<21)) {
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av_log(avctx, AV_LOG_ERROR, "block_align is not set or invalid\n");
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return AVERROR(EINVAL);
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}
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av_assert0(avctx->channels >= 0);
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if (avctx->channels > WMALL_MAX_CHANNELS) {
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avpriv_request_sample(avctx,
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"More than " AV_STRINGIFY(WMALL_MAX_CHANNELS) " channels");
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return AVERROR_PATCHWELCOME;
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}
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s->max_frame_size = MAX_FRAMESIZE * avctx->channels;
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s->frame_data = av_mallocz(s->max_frame_size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!s->frame_data)
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return AVERROR(ENOMEM);
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s->avctx = avctx;
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ff_llauddsp_init(&s->dsp);
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init_put_bits(&s->pb, s->frame_data, s->max_frame_size);
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if (avctx->extradata_size >= 18) {
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s->decode_flags = AV_RL16(edata_ptr + 14);
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channel_mask = AV_RL32(edata_ptr + 2);
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s->bits_per_sample = AV_RL16(edata_ptr);
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if (s->bits_per_sample == 16)
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avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
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else if (s->bits_per_sample == 24) {
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avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
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avctx->bits_per_raw_sample = 24;
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} else {
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av_log(avctx, AV_LOG_ERROR, "Unknown bit-depth: %"PRIu8"\n",
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s->bits_per_sample);
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return AVERROR_INVALIDDATA;
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}
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/* dump the extradata */
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for (i = 0; i < avctx->extradata_size; i++)
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ff_dlog(avctx, "[%x] ", avctx->extradata[i]);
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ff_dlog(avctx, "\n");
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} else {
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avpriv_request_sample(avctx, "Unsupported extradata size");
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return AVERROR_PATCHWELCOME;
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}
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/* generic init */
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s->log2_frame_size = av_log2(avctx->block_align) + 4;
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/* frame info */
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s->skip_frame = 1; /* skip first frame */
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s->packet_loss = 1;
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s->len_prefix = s->decode_flags & 0x40;
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/* get frame len */
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s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
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3, s->decode_flags);
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av_assert0(s->samples_per_frame <= WMALL_BLOCK_MAX_SIZE);
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/* init previous block len */
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for (i = 0; i < avctx->channels; i++)
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s->channel[i].prev_block_len = s->samples_per_frame;
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/* subframe info */
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log2_max_num_subframes = (s->decode_flags & 0x38) >> 3;
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s->max_num_subframes = 1 << log2_max_num_subframes;
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s->max_subframe_len_bit = 0;
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s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
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s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
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s->dynamic_range_compression = s->decode_flags & 0x80;
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s->bV3RTM = s->decode_flags & 0x100;
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if (s->max_num_subframes > MAX_SUBFRAMES) {
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av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %"PRIu8"\n",
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s->max_num_subframes);
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return AVERROR_INVALIDDATA;
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}
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s->num_channels = avctx->channels;
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/* extract lfe channel position */
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s->lfe_channel = -1;
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if (channel_mask & 8) {
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unsigned int mask;
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for (mask = 1; mask < 16; mask <<= 1)
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if (channel_mask & mask)
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++s->lfe_channel;
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}
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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avctx->channel_layout = channel_mask;
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return 0;
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}
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/**
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* @brief Decode the subframe length.
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* @param s context
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* @param offset sample offset in the frame
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* @return decoded subframe length on success, < 0 in case of an error
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*/
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static int decode_subframe_length(WmallDecodeCtx *s, int offset)
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{
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int frame_len_ratio, subframe_len, len;
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/* no need to read from the bitstream when only one length is possible */
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if (offset == s->samples_per_frame - s->min_samples_per_subframe)
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return s->min_samples_per_subframe;
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len = av_log2(s->max_num_subframes - 1) + 1;
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frame_len_ratio = get_bits(&s->gb, len);
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subframe_len = s->min_samples_per_subframe * (frame_len_ratio + 1);
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/* sanity check the length */
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if (subframe_len < s->min_samples_per_subframe ||
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subframe_len > s->samples_per_frame) {
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av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
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subframe_len);
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return AVERROR_INVALIDDATA;
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}
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return subframe_len;
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}
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/**
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* @brief Decode how the data in the frame is split into subframes.
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* Every WMA frame contains the encoded data for a fixed number of
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* samples per channel. The data for every channel might be split
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* into several subframes. This function will reconstruct the list of
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* subframes for every channel.
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*
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* If the subframes are not evenly split, the algorithm estimates the
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* channels with the lowest number of total samples.
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* Afterwards, for each of these channels a bit is read from the
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* bitstream that indicates if the channel contains a subframe with the
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* next subframe size that is going to be read from the bitstream or not.
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* If a channel contains such a subframe, the subframe size gets added to
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* the channel's subframe list.
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* The algorithm repeats these steps until the frame is properly divided
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* between the individual channels.
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*
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* @param s context
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* @return 0 on success, < 0 in case of an error
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*/
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static int decode_tilehdr(WmallDecodeCtx *s)
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{
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uint16_t num_samples[WMALL_MAX_CHANNELS] = { 0 }; /* sum of samples for all currently known subframes of a channel */
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uint8_t contains_subframe[WMALL_MAX_CHANNELS]; /* flag indicating if a channel contains the current subframe */
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int channels_for_cur_subframe = s->num_channels; /* number of channels that contain the current subframe */
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int fixed_channel_layout = 0; /* flag indicating that all channels use the same subfra2me offsets and sizes */
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int min_channel_len = 0; /* smallest sum of samples (channels with this length will be processed first) */
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int c, tile_aligned;
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/* reset tiling information */
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for (c = 0; c < s->num_channels; c++)
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s->channel[c].num_subframes = 0;
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tile_aligned = get_bits1(&s->gb);
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if (s->max_num_subframes == 1 || tile_aligned)
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fixed_channel_layout = 1;
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/* loop until the frame data is split between the subframes */
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do {
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int subframe_len, in_use = 0;
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/* check which channels contain the subframe */
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for (c = 0; c < s->num_channels; c++) {
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if (num_samples[c] == min_channel_len) {
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if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
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(min_channel_len == s->samples_per_frame - s->min_samples_per_subframe)) {
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contains_subframe[c] = 1;
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} else {
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contains_subframe[c] = get_bits1(&s->gb);
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}
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in_use |= contains_subframe[c];
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} else
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contains_subframe[c] = 0;
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}
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if (!in_use) {
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av_log(s->avctx, AV_LOG_ERROR,
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"Found empty subframe\n");
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return AVERROR_INVALIDDATA;
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}
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/* get subframe length, subframe_len == 0 is not allowed */
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if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
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return AVERROR_INVALIDDATA;
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/* add subframes to the individual channels and find new min_channel_len */
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min_channel_len += subframe_len;
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for (c = 0; c < s->num_channels; c++) {
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WmallChannelCtx *chan = &s->channel[c];
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if (contains_subframe[c]) {
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if (chan->num_subframes >= MAX_SUBFRAMES) {
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av_log(s->avctx, AV_LOG_ERROR,
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"broken frame: num subframes > 31\n");
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return AVERROR_INVALIDDATA;
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}
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chan->subframe_len[chan->num_subframes] = subframe_len;
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num_samples[c] += subframe_len;
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++chan->num_subframes;
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if (num_samples[c] > s->samples_per_frame) {
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av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
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"channel len(%"PRIu16") > samples_per_frame(%"PRIu16")\n",
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num_samples[c], s->samples_per_frame);
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return AVERROR_INVALIDDATA;
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}
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} else if (num_samples[c] <= min_channel_len) {
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if (num_samples[c] < min_channel_len) {
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channels_for_cur_subframe = 0;
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min_channel_len = num_samples[c];
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}
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++channels_for_cur_subframe;
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}
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}
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} while (min_channel_len < s->samples_per_frame);
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for (c = 0; c < s->num_channels; c++) {
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int i, offset = 0;
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for (i = 0; i < s->channel[c].num_subframes; i++) {
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s->channel[c].subframe_offsets[i] = offset;
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offset += s->channel[c].subframe_len[i];
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}
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}
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return 0;
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}
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static void decode_ac_filter(WmallDecodeCtx *s)
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{
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int i;
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s->acfilter_order = get_bits(&s->gb, 4) + 1;
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s->acfilter_scaling = get_bits(&s->gb, 4);
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for (i = 0; i < s->acfilter_order; i++)
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s->acfilter_coeffs[i] = get_bitsz(&s->gb, s->acfilter_scaling) + 1;
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}
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static void decode_mclms(WmallDecodeCtx *s)
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{
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s->mclms_order = (get_bits(&s->gb, 4) + 1) * 2;
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s->mclms_scaling = get_bits(&s->gb, 4);
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if (get_bits1(&s->gb)) {
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int i, send_coef_bits;
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int cbits = av_log2(s->mclms_scaling + 1);
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if (1 << cbits < s->mclms_scaling + 1)
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cbits++;
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send_coef_bits = get_bitsz(&s->gb, cbits) + 2;
|
|
|
|
for (i = 0; i < s->mclms_order * s->num_channels * s->num_channels; i++)
|
|
s->mclms_coeffs[i] = get_bits(&s->gb, send_coef_bits);
|
|
|
|
for (i = 0; i < s->num_channels; i++) {
|
|
int c;
|
|
for (c = 0; c < i; c++)
|
|
s->mclms_coeffs_cur[i * s->num_channels + c] = get_bits(&s->gb, send_coef_bits);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int decode_cdlms(WmallDecodeCtx *s)
|
|
{
|
|
int c, i;
|
|
int cdlms_send_coef = get_bits1(&s->gb);
|
|
|
|
for (c = 0; c < s->num_channels; c++) {
|
|
s->cdlms_ttl[c] = get_bits(&s->gb, 3) + 1;
|
|
for (i = 0; i < s->cdlms_ttl[c]; i++) {
|
|
s->cdlms[c][i].order = (get_bits(&s->gb, 7) + 1) * 8;
|
|
if (s->cdlms[c][i].order > MAX_ORDER) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"Order[%d][%d] %d > max (%d), not supported\n",
|
|
c, i, s->cdlms[c][i].order, MAX_ORDER);
|
|
s->cdlms[0][0].order = 0;
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if(s->cdlms[c][i].order & 8 && s->bits_per_sample == 16) {
|
|
static int warned;
|
|
if(!warned)
|
|
avpriv_request_sample(s->avctx, "CDLMS of order %d",
|
|
s->cdlms[c][i].order);
|
|
warned = 1;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < s->cdlms_ttl[c]; i++)
|
|
s->cdlms[c][i].scaling = get_bits(&s->gb, 4);
|
|
|
|
if (cdlms_send_coef) {
|
|
for (i = 0; i < s->cdlms_ttl[c]; i++) {
|
|
int cbits, shift_l, shift_r, j;
|
|
cbits = av_log2(s->cdlms[c][i].order);
|
|
if ((1 << cbits) < s->cdlms[c][i].order)
|
|
cbits++;
|
|
s->cdlms[c][i].coefsend = get_bits(&s->gb, cbits) + 1;
|
|
|
|
cbits = av_log2(s->cdlms[c][i].scaling + 1);
|
|
if ((1 << cbits) < s->cdlms[c][i].scaling + 1)
|
|
cbits++;
|
|
|
|
s->cdlms[c][i].bitsend = get_bitsz(&s->gb, cbits) + 2;
|
|
shift_l = 32 - s->cdlms[c][i].bitsend;
|
|
shift_r = 32 - s->cdlms[c][i].scaling - 2;
|
|
for (j = 0; j < s->cdlms[c][i].coefsend; j++)
|
|
s->cdlms[c][i].coefs[j] =
|
|
(get_bits(&s->gb, s->cdlms[c][i].bitsend) << shift_l) >> shift_r;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < s->cdlms_ttl[c]; i++)
|
|
memset(s->cdlms[c][i].coefs + s->cdlms[c][i].order,
|
|
0, WMALL_COEFF_PAD_SIZE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_channel_residues(WmallDecodeCtx *s, int ch, int tile_size)
|
|
{
|
|
int i = 0;
|
|
unsigned int ave_mean;
|
|
s->transient[ch] = get_bits1(&s->gb);
|
|
if (s->transient[ch]) {
|
|
s->transient_pos[ch] = get_bits(&s->gb, av_log2(tile_size));
|
|
if (s->transient_pos[ch])
|
|
s->transient[ch] = 0;
|
|
s->channel[ch].transient_counter =
|
|
FFMAX(s->channel[ch].transient_counter, s->samples_per_frame / 2);
|
|
} else if (s->channel[ch].transient_counter)
|
|
s->transient[ch] = 1;
|
|
|
|
if (s->seekable_tile) {
|
|
ave_mean = get_bits(&s->gb, s->bits_per_sample);
|
|
s->ave_sum[ch] = ave_mean << (s->movave_scaling + 1);
|
|
}
|
|
|
|
if (s->seekable_tile) {
|
|
if (s->do_inter_ch_decorr)
|
|
s->channel_residues[ch][0] = get_sbits_long(&s->gb, s->bits_per_sample + 1);
|
|
else
|
|
s->channel_residues[ch][0] = get_sbits_long(&s->gb, s->bits_per_sample);
|
|
i++;
|
|
}
|
|
for (; i < tile_size; i++) {
|
|
int rem, rem_bits;
|
|
unsigned quo = 0, residue;
|
|
while(get_bits1(&s->gb)) {
|
|
quo++;
|
|
if (get_bits_left(&s->gb) <= 0)
|
|
return -1;
|
|
}
|
|
if (quo >= 32)
|
|
quo += get_bits_long(&s->gb, get_bits(&s->gb, 5) + 1);
|
|
|
|
ave_mean = (s->ave_sum[ch] + (1 << s->movave_scaling)) >> (s->movave_scaling + 1);
|
|
if (ave_mean <= 1)
|
|
residue = quo;
|
|
else {
|
|
rem_bits = av_ceil_log2(ave_mean);
|
|
rem = get_bits_long(&s->gb, rem_bits);
|
|
residue = (quo << rem_bits) + rem;
|
|
}
|
|
|
|
s->ave_sum[ch] = residue + s->ave_sum[ch] -
|
|
(s->ave_sum[ch] >> s->movave_scaling);
|
|
|
|
residue = (residue >> 1) ^ -(residue & 1);
|
|
s->channel_residues[ch][i] = residue;
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static void decode_lpc(WmallDecodeCtx *s)
|
|
{
|
|
int ch, i, cbits;
|
|
s->lpc_order = get_bits(&s->gb, 5) + 1;
|
|
s->lpc_scaling = get_bits(&s->gb, 4);
|
|
s->lpc_intbits = get_bits(&s->gb, 3) + 1;
|
|
cbits = s->lpc_scaling + s->lpc_intbits;
|
|
for (ch = 0; ch < s->num_channels; ch++)
|
|
for (i = 0; i < s->lpc_order; i++)
|
|
s->lpc_coefs[ch][i] = get_sbits(&s->gb, cbits);
|
|
}
|
|
|
|
static void clear_codec_buffers(WmallDecodeCtx *s)
|
|
{
|
|
int ich, ilms;
|
|
|
|
memset(s->acfilter_coeffs, 0, sizeof(s->acfilter_coeffs));
|
|
memset(s->acfilter_prevvalues, 0, sizeof(s->acfilter_prevvalues));
|
|
memset(s->lpc_coefs, 0, sizeof(s->lpc_coefs));
|
|
|
|
memset(s->mclms_coeffs, 0, sizeof(s->mclms_coeffs));
|
|
memset(s->mclms_coeffs_cur, 0, sizeof(s->mclms_coeffs_cur));
|
|
memset(s->mclms_prevvalues, 0, sizeof(s->mclms_prevvalues));
|
|
memset(s->mclms_updates, 0, sizeof(s->mclms_updates));
|
|
|
|
for (ich = 0; ich < s->num_channels; ich++) {
|
|
for (ilms = 0; ilms < s->cdlms_ttl[ich]; ilms++) {
|
|
memset(s->cdlms[ich][ilms].coefs, 0,
|
|
sizeof(s->cdlms[ich][ilms].coefs));
|
|
memset(s->cdlms[ich][ilms].lms_prevvalues, 0,
|
|
sizeof(s->cdlms[ich][ilms].lms_prevvalues));
|
|
memset(s->cdlms[ich][ilms].lms_updates, 0,
|
|
sizeof(s->cdlms[ich][ilms].lms_updates));
|
|
}
|
|
s->ave_sum[ich] = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Reset filter parameters and transient area at new seekable tile.
|
|
*/
|
|
static void reset_codec(WmallDecodeCtx *s)
|
|
{
|
|
int ich, ilms;
|
|
s->mclms_recent = s->mclms_order * s->num_channels;
|
|
for (ich = 0; ich < s->num_channels; ich++) {
|
|
for (ilms = 0; ilms < s->cdlms_ttl[ich]; ilms++)
|
|
s->cdlms[ich][ilms].recent = s->cdlms[ich][ilms].order;
|
|
/* first sample of a seekable subframe is considered as the starting of
|
|
a transient area which is samples_per_frame samples long */
|
|
s->channel[ich].transient_counter = s->samples_per_frame;
|
|
s->transient[ich] = 1;
|
|
s->transient_pos[ich] = 0;
|
|
}
|
|
}
|
|
|
|
static void mclms_update(WmallDecodeCtx *s, int icoef, int *pred)
|
|
{
|
|
int i, j, ich, pred_error;
|
|
int order = s->mclms_order;
|
|
int num_channels = s->num_channels;
|
|
int range = 1 << (s->bits_per_sample - 1);
|
|
|
|
for (ich = 0; ich < num_channels; ich++) {
|
|
pred_error = s->channel_residues[ich][icoef] - (unsigned)pred[ich];
|
|
if (pred_error > 0) {
|
|
for (i = 0; i < order * num_channels; i++)
|
|
s->mclms_coeffs[i + ich * order * num_channels] +=
|
|
s->mclms_updates[s->mclms_recent + i];
|
|
for (j = 0; j < ich; j++)
|
|
s->mclms_coeffs_cur[ich * num_channels + j] += WMASIGN(s->channel_residues[j][icoef]);
|
|
} else if (pred_error < 0) {
|
|
for (i = 0; i < order * num_channels; i++)
|
|
s->mclms_coeffs[i + ich * order * num_channels] -=
|
|
s->mclms_updates[s->mclms_recent + i];
|
|
for (j = 0; j < ich; j++)
|
|
s->mclms_coeffs_cur[ich * num_channels + j] -= WMASIGN(s->channel_residues[j][icoef]);
|
|
}
|
|
}
|
|
|
|
for (ich = num_channels - 1; ich >= 0; ich--) {
|
|
s->mclms_recent--;
|
|
s->mclms_prevvalues[s->mclms_recent] = av_clip(s->channel_residues[ich][icoef],
|
|
-range, range - 1);
|
|
s->mclms_updates[s->mclms_recent] = WMASIGN(s->channel_residues[ich][icoef]);
|
|
}
|
|
|
|
if (s->mclms_recent == 0) {
|
|
memcpy(&s->mclms_prevvalues[order * num_channels],
|
|
s->mclms_prevvalues,
|
|
sizeof(int32_t) * order * num_channels);
|
|
memcpy(&s->mclms_updates[order * num_channels],
|
|
s->mclms_updates,
|
|
sizeof(int32_t) * order * num_channels);
|
|
s->mclms_recent = num_channels * order;
|
|
}
|
|
}
|
|
|
|
static void mclms_predict(WmallDecodeCtx *s, int icoef, int *pred)
|
|
{
|
|
int ich, i;
|
|
int order = s->mclms_order;
|
|
int num_channels = s->num_channels;
|
|
|
|
for (ich = 0; ich < num_channels; ich++) {
|
|
pred[ich] = 0;
|
|
if (!s->is_channel_coded[ich])
|
|
continue;
|
|
for (i = 0; i < order * num_channels; i++)
|
|
pred[ich] += (uint32_t)s->mclms_prevvalues[i + s->mclms_recent] *
|
|
s->mclms_coeffs[i + order * num_channels * ich];
|
|
for (i = 0; i < ich; i++)
|
|
pred[ich] += (uint32_t)s->channel_residues[i][icoef] *
|
|
s->mclms_coeffs_cur[i + num_channels * ich];
|
|
pred[ich] += (1U << s->mclms_scaling) >> 1;
|
|
pred[ich] >>= s->mclms_scaling;
|
|
s->channel_residues[ich][icoef] += (unsigned)pred[ich];
|
|
}
|
|
}
|
|
|
|
static void revert_mclms(WmallDecodeCtx *s, int tile_size)
|
|
{
|
|
int icoef, pred[WMALL_MAX_CHANNELS] = { 0 };
|
|
for (icoef = 0; icoef < tile_size; icoef++) {
|
|
mclms_predict(s, icoef, pred);
|
|
mclms_update(s, icoef, pred);
|
|
}
|
|
}
|
|
|
|
static void use_high_update_speed(WmallDecodeCtx *s, int ich)
|
|
{
|
|
int ilms, recent, icoef;
|
|
for (ilms = s->cdlms_ttl[ich] - 1; ilms >= 0; ilms--) {
|
|
recent = s->cdlms[ich][ilms].recent;
|
|
if (s->update_speed[ich] == 16)
|
|
continue;
|
|
if (s->bV3RTM) {
|
|
for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
|
|
s->cdlms[ich][ilms].lms_updates[icoef + recent] *= 2;
|
|
} else {
|
|
for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
|
|
s->cdlms[ich][ilms].lms_updates[icoef] *= 2;
|
|
}
|
|
}
|
|
s->update_speed[ich] = 16;
|
|
}
|
|
|
|
static void use_normal_update_speed(WmallDecodeCtx *s, int ich)
|
|
{
|
|
int ilms, recent, icoef;
|
|
for (ilms = s->cdlms_ttl[ich] - 1; ilms >= 0; ilms--) {
|
|
recent = s->cdlms[ich][ilms].recent;
|
|
if (s->update_speed[ich] == 8)
|
|
continue;
|
|
if (s->bV3RTM)
|
|
for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
|
|
s->cdlms[ich][ilms].lms_updates[icoef + recent] /= 2;
|
|
else
|
|
for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
|
|
s->cdlms[ich][ilms].lms_updates[icoef] /= 2;
|
|
}
|
|
s->update_speed[ich] = 8;
|
|
}
|
|
|
|
#define CD_LMS(bits, ROUND) \
|
|
static void lms_update ## bits (WmallDecodeCtx *s, int ich, int ilms, int input) \
|
|
{ \
|
|
int recent = s->cdlms[ich][ilms].recent; \
|
|
int range = 1 << s->bits_per_sample - 1; \
|
|
int order = s->cdlms[ich][ilms].order; \
|
|
int ##bits##_t *prev = (int##bits##_t *)s->cdlms[ich][ilms].lms_prevvalues; \
|
|
\
|
|
if (recent) \
|
|
recent--; \
|
|
else { \
|
|
memcpy(prev + order, prev, (bits/8) * order); \
|
|
memcpy(s->cdlms[ich][ilms].lms_updates + order, \
|
|
s->cdlms[ich][ilms].lms_updates, \
|
|
sizeof(*s->cdlms[ich][ilms].lms_updates) * order); \
|
|
recent = order - 1; \
|
|
} \
|
|
\
|
|
prev[recent] = av_clip(input, -range, range - 1); \
|
|
s->cdlms[ich][ilms].lms_updates[recent] = WMASIGN(input) * s->update_speed[ich]; \
|
|
\
|
|
s->cdlms[ich][ilms].lms_updates[recent + (order >> 4)] >>= 2; \
|
|
s->cdlms[ich][ilms].lms_updates[recent + (order >> 3)] >>= 1; \
|
|
s->cdlms[ich][ilms].recent = recent; \
|
|
memset(s->cdlms[ich][ilms].lms_updates + recent + order, 0, \
|
|
sizeof(s->cdlms[ich][ilms].lms_updates) - \
|
|
sizeof(*s->cdlms[ich][ilms].lms_updates)*(recent+order)); \
|
|
} \
|
|
\
|
|
static void revert_cdlms ## bits (WmallDecodeCtx *s, int ch, \
|
|
int coef_begin, int coef_end) \
|
|
{ \
|
|
int icoef, ilms, num_lms, residue, input; \
|
|
unsigned pred;\
|
|
\
|
|
num_lms = s->cdlms_ttl[ch]; \
|
|
for (ilms = num_lms - 1; ilms >= 0; ilms--) { \
|
|
for (icoef = coef_begin; icoef < coef_end; icoef++) { \
|
|
int##bits##_t *prevvalues = (int##bits##_t *)s->cdlms[ch][ilms].lms_prevvalues; \
|
|
pred = (1 << s->cdlms[ch][ilms].scaling) >> 1; \
|
|
residue = s->channel_residues[ch][icoef]; \
|
|
pred += s->dsp.scalarproduct_and_madd_int## bits (s->cdlms[ch][ilms].coefs, \
|
|
prevvalues + s->cdlms[ch][ilms].recent, \
|
|
s->cdlms[ch][ilms].lms_updates + \
|
|
s->cdlms[ch][ilms].recent, \
|
|
FFALIGN(s->cdlms[ch][ilms].order, ROUND), \
|
|
WMASIGN(residue)); \
|
|
input = residue + (unsigned)((int)pred >> s->cdlms[ch][ilms].scaling); \
|
|
lms_update ## bits(s, ch, ilms, input); \
|
|
s->channel_residues[ch][icoef] = input; \
|
|
} \
|
|
} \
|
|
if (bits <= 16) emms_c(); \
|
|
}
|
|
|
|
CD_LMS(16, WMALL_COEFF_PAD_SIZE)
|
|
CD_LMS(32, 8)
|
|
|
|
static void revert_inter_ch_decorr(WmallDecodeCtx *s, int tile_size)
|
|
{
|
|
if (s->num_channels != 2)
|
|
return;
|
|
else if (s->is_channel_coded[0] || s->is_channel_coded[1]) {
|
|
int icoef;
|
|
for (icoef = 0; icoef < tile_size; icoef++) {
|
|
s->channel_residues[0][icoef] -= (unsigned)(s->channel_residues[1][icoef] >> 1);
|
|
s->channel_residues[1][icoef] += (unsigned) s->channel_residues[0][icoef];
|
|
}
|
|
}
|
|
}
|
|
|
|
static void revert_acfilter(WmallDecodeCtx *s, int tile_size)
|
|
{
|
|
int ich, pred, i, j;
|
|
int16_t *filter_coeffs = s->acfilter_coeffs;
|
|
int scaling = s->acfilter_scaling;
|
|
int order = s->acfilter_order;
|
|
|
|
for (ich = 0; ich < s->num_channels; ich++) {
|
|
int *prevvalues = s->acfilter_prevvalues[ich];
|
|
for (i = 0; i < order; i++) {
|
|
pred = 0;
|
|
for (j = 0; j < order; j++) {
|
|
if (i <= j)
|
|
pred += (uint32_t)filter_coeffs[j] * prevvalues[j - i];
|
|
else
|
|
pred += (uint32_t)s->channel_residues[ich][i - j - 1] * filter_coeffs[j];
|
|
}
|
|
pred >>= scaling;
|
|
s->channel_residues[ich][i] += (unsigned)pred;
|
|
}
|
|
for (i = order; i < tile_size; i++) {
|
|
pred = 0;
|
|
for (j = 0; j < order; j++)
|
|
pred += (uint32_t)s->channel_residues[ich][i - j - 1] * filter_coeffs[j];
|
|
pred >>= scaling;
|
|
s->channel_residues[ich][i] += (unsigned)pred;
|
|
}
|
|
for (j = order - 1; j >= 0; j--)
|
|
if (tile_size <= j) {
|
|
prevvalues[j] = prevvalues[j - tile_size];
|
|
}else
|
|
prevvalues[j] = s->channel_residues[ich][tile_size - j - 1];
|
|
}
|
|
}
|
|
|
|
static int decode_subframe(WmallDecodeCtx *s)
|
|
{
|
|
int offset = s->samples_per_frame;
|
|
int subframe_len = s->samples_per_frame;
|
|
int total_samples = s->samples_per_frame * s->num_channels;
|
|
int i, j, rawpcm_tile, padding_zeroes, res;
|
|
|
|
s->subframe_offset = get_bits_count(&s->gb);
|
|
|
|
/* reset channel context and find the next block offset and size
|
|
== the next block of the channel with the smallest number of
|
|
decoded samples */
|
|
for (i = 0; i < s->num_channels; i++) {
|
|
if (offset > s->channel[i].decoded_samples) {
|
|
offset = s->channel[i].decoded_samples;
|
|
subframe_len =
|
|
s->channel[i].subframe_len[s->channel[i].cur_subframe];
|
|
}
|
|
}
|
|
|
|
/* get a list of all channels that contain the estimated block */
|
|
s->channels_for_cur_subframe = 0;
|
|
for (i = 0; i < s->num_channels; i++) {
|
|
const int cur_subframe = s->channel[i].cur_subframe;
|
|
/* subtract already processed samples */
|
|
total_samples -= s->channel[i].decoded_samples;
|
|
|
|
/* and count if there are multiple subframes that match our profile */
|
|
if (offset == s->channel[i].decoded_samples &&
|
|
subframe_len == s->channel[i].subframe_len[cur_subframe]) {
|
|
total_samples -= s->channel[i].subframe_len[cur_subframe];
|
|
s->channel[i].decoded_samples +=
|
|
s->channel[i].subframe_len[cur_subframe];
|
|
s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
|
|
++s->channels_for_cur_subframe;
|
|
}
|
|
}
|
|
|
|
/* check if the frame will be complete after processing the
|
|
estimated block */
|
|
if (!total_samples)
|
|
s->parsed_all_subframes = 1;
|
|
|
|
|
|
s->seekable_tile = get_bits1(&s->gb);
|
|
if (s->seekable_tile) {
|
|
clear_codec_buffers(s);
|
|
|
|
s->do_arith_coding = get_bits1(&s->gb);
|
|
if (s->do_arith_coding) {
|
|
avpriv_request_sample(s->avctx, "Arithmetic coding");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
s->do_ac_filter = get_bits1(&s->gb);
|
|
s->do_inter_ch_decorr = get_bits1(&s->gb);
|
|
s->do_mclms = get_bits1(&s->gb);
|
|
|
|
if (s->do_ac_filter)
|
|
decode_ac_filter(s);
|
|
|
|
if (s->do_mclms)
|
|
decode_mclms(s);
|
|
|
|
if ((res = decode_cdlms(s)) < 0)
|
|
return res;
|
|
s->movave_scaling = get_bits(&s->gb, 3);
|
|
s->quant_stepsize = get_bits(&s->gb, 8) + 1;
|
|
|
|
reset_codec(s);
|
|
}
|
|
|
|
rawpcm_tile = get_bits1(&s->gb);
|
|
|
|
if (!rawpcm_tile && !s->cdlms[0][0].order) {
|
|
av_log(s->avctx, AV_LOG_DEBUG,
|
|
"Waiting for seekable tile\n");
|
|
av_frame_unref(s->frame);
|
|
return -1;
|
|
}
|
|
|
|
|
|
for (i = 0; i < s->num_channels; i++)
|
|
s->is_channel_coded[i] = 1;
|
|
|
|
if (!rawpcm_tile) {
|
|
for (i = 0; i < s->num_channels; i++)
|
|
s->is_channel_coded[i] = get_bits1(&s->gb);
|
|
|
|
if (s->bV3RTM) {
|
|
// LPC
|
|
s->do_lpc = get_bits1(&s->gb);
|
|
if (s->do_lpc) {
|
|
decode_lpc(s);
|
|
avpriv_request_sample(s->avctx, "Expect wrong output since "
|
|
"inverse LPC filter");
|
|
}
|
|
} else
|
|
s->do_lpc = 0;
|
|
}
|
|
|
|
|
|
if (get_bits1(&s->gb))
|
|
padding_zeroes = get_bits(&s->gb, 5);
|
|
else
|
|
padding_zeroes = 0;
|
|
|
|
if (rawpcm_tile) {
|
|
int bits = s->bits_per_sample - padding_zeroes;
|
|
if (bits <= 0) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"Invalid number of padding bits in raw PCM tile\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
ff_dlog(s->avctx, "RAWPCM %d bits per sample. "
|
|
"total %d bits, remain=%d\n", bits,
|
|
bits * s->num_channels * subframe_len, get_bits_count(&s->gb));
|
|
for (i = 0; i < s->num_channels; i++)
|
|
for (j = 0; j < subframe_len; j++)
|
|
s->channel_residues[i][j] = get_sbits_long(&s->gb, bits);
|
|
} else {
|
|
if (s->bits_per_sample < padding_zeroes)
|
|
return AVERROR_INVALIDDATA;
|
|
for (i = 0; i < s->num_channels; i++) {
|
|
if (s->is_channel_coded[i]) {
|
|
decode_channel_residues(s, i, subframe_len);
|
|
if (s->seekable_tile)
|
|
use_high_update_speed(s, i);
|
|
else
|
|
use_normal_update_speed(s, i);
|
|
if (s->bits_per_sample > 16)
|
|
revert_cdlms32(s, i, 0, subframe_len);
|
|
else
|
|
revert_cdlms16(s, i, 0, subframe_len);
|
|
} else {
|
|
memset(s->channel_residues[i], 0, sizeof(**s->channel_residues) * subframe_len);
|
|
}
|
|
}
|
|
|
|
if (s->do_mclms)
|
|
revert_mclms(s, subframe_len);
|
|
if (s->do_inter_ch_decorr)
|
|
revert_inter_ch_decorr(s, subframe_len);
|
|
if (s->do_ac_filter)
|
|
revert_acfilter(s, subframe_len);
|
|
|
|
/* Dequantize */
|
|
if (s->quant_stepsize != 1)
|
|
for (i = 0; i < s->num_channels; i++)
|
|
for (j = 0; j < subframe_len; j++)
|
|
s->channel_residues[i][j] *= (unsigned)s->quant_stepsize;
|
|
}
|
|
|
|
/* Write to proper output buffer depending on bit-depth */
|
|
for (i = 0; i < s->channels_for_cur_subframe; i++) {
|
|
int c = s->channel_indexes_for_cur_subframe[i];
|
|
int subframe_len = s->channel[c].subframe_len[s->channel[c].cur_subframe];
|
|
|
|
for (j = 0; j < subframe_len; j++) {
|
|
if (s->bits_per_sample == 16) {
|
|
*s->samples_16[c]++ = (int16_t) s->channel_residues[c][j] * (1 << padding_zeroes);
|
|
} else {
|
|
*s->samples_32[c]++ = s->channel_residues[c][j] * (256U << padding_zeroes);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* handled one subframe */
|
|
for (i = 0; i < s->channels_for_cur_subframe; i++) {
|
|
int c = s->channel_indexes_for_cur_subframe[i];
|
|
if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
++s->channel[c].cur_subframe;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Decode one WMA frame.
|
|
* @param s codec context
|
|
* @return 0 if the trailer bit indicates that this is the last frame,
|
|
* 1 if there are additional frames
|
|
*/
|
|
static int decode_frame(WmallDecodeCtx *s)
|
|
{
|
|
GetBitContext* gb = &s->gb;
|
|
int more_frames = 0, len = 0, i, ret;
|
|
|
|
s->frame->nb_samples = s->samples_per_frame;
|
|
if ((ret = ff_get_buffer(s->avctx, s->frame, 0)) < 0) {
|
|
/* return an error if no frame could be decoded at all */
|
|
s->packet_loss = 1;
|
|
s->frame->nb_samples = 0;
|
|
return ret;
|
|
}
|
|
for (i = 0; i < s->num_channels; i++) {
|
|
s->samples_16[i] = (int16_t *)s->frame->extended_data[i];
|
|
s->samples_32[i] = (int32_t *)s->frame->extended_data[i];
|
|
}
|
|
|
|
/* get frame length */
|
|
if (s->len_prefix)
|
|
len = get_bits(gb, s->log2_frame_size);
|
|
|
|
/* decode tile information */
|
|
if ((ret = decode_tilehdr(s))) {
|
|
s->packet_loss = 1;
|
|
av_frame_unref(s->frame);
|
|
return ret;
|
|
}
|
|
|
|
/* read drc info */
|
|
if (s->dynamic_range_compression)
|
|
s->drc_gain = get_bits(gb, 8);
|
|
|
|
/* no idea what these are for, might be the number of samples
|
|
that need to be skipped at the beginning or end of a stream */
|
|
if (get_bits1(gb)) {
|
|
int av_unused skip;
|
|
|
|
/* usually true for the first frame */
|
|
if (get_bits1(gb)) {
|
|
skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
|
|
ff_dlog(s->avctx, "start skip: %i\n", skip);
|
|
}
|
|
|
|
/* sometimes true for the last frame */
|
|
if (get_bits1(gb)) {
|
|
skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
|
|
ff_dlog(s->avctx, "end skip: %i\n", skip);
|
|
s->frame->nb_samples -= skip;
|
|
if (s->frame->nb_samples <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
}
|
|
|
|
/* reset subframe states */
|
|
s->parsed_all_subframes = 0;
|
|
for (i = 0; i < s->num_channels; i++) {
|
|
s->channel[i].decoded_samples = 0;
|
|
s->channel[i].cur_subframe = 0;
|
|
}
|
|
|
|
/* decode all subframes */
|
|
while (!s->parsed_all_subframes) {
|
|
int decoded_samples = s->channel[0].decoded_samples;
|
|
if (decode_subframe(s) < 0) {
|
|
s->packet_loss = 1;
|
|
if (s->frame->nb_samples)
|
|
s->frame->nb_samples = decoded_samples;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
ff_dlog(s->avctx, "Frame done\n");
|
|
|
|
s->skip_frame = 0;
|
|
|
|
if (s->len_prefix) {
|
|
if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
|
|
/* FIXME: not sure if this is always an error */
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"frame[%"PRIu32"] would have to skip %i bits\n",
|
|
s->frame_num,
|
|
len - (get_bits_count(gb) - s->frame_offset) - 1);
|
|
s->packet_loss = 1;
|
|
return 0;
|
|
}
|
|
|
|
/* skip the rest of the frame data */
|
|
skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
|
|
}
|
|
|
|
/* decode trailer bit */
|
|
more_frames = get_bits1(gb);
|
|
++s->frame_num;
|
|
return more_frames;
|
|
}
|
|
|
|
/**
|
|
* @brief Calculate remaining input buffer length.
|
|
* @param s codec context
|
|
* @param gb bitstream reader context
|
|
* @return remaining size in bits
|
|
*/
|
|
static int remaining_bits(WmallDecodeCtx *s, GetBitContext *gb)
|
|
{
|
|
return s->buf_bit_size - get_bits_count(gb);
|
|
}
|
|
|
|
/**
|
|
* @brief Fill the bit reservoir with a (partial) frame.
|
|
* @param s codec context
|
|
* @param gb bitstream reader context
|
|
* @param len length of the partial frame
|
|
* @param append decides whether to reset the buffer or not
|
|
*/
|
|
static void save_bits(WmallDecodeCtx *s, GetBitContext* gb, int len,
|
|
int append)
|
|
{
|
|
int buflen;
|
|
PutBitContext tmp;
|
|
|
|
/* when the frame data does not need to be concatenated, the input buffer
|
|
is reset and additional bits from the previous frame are copied
|
|
and skipped later so that a fast byte copy is possible */
|
|
|
|
if (!append) {
|
|
s->frame_offset = get_bits_count(gb) & 7;
|
|
s->num_saved_bits = s->frame_offset;
|
|
init_put_bits(&s->pb, s->frame_data, s->max_frame_size);
|
|
}
|
|
|
|
buflen = (s->num_saved_bits + len + 8) >> 3;
|
|
|
|
if (len <= 0 || buflen > s->max_frame_size) {
|
|
avpriv_request_sample(s->avctx, "Too small input buffer");
|
|
s->packet_loss = 1;
|
|
s->num_saved_bits = 0;
|
|
return;
|
|
}
|
|
|
|
s->num_saved_bits += len;
|
|
if (!append) {
|
|
avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
|
|
s->num_saved_bits);
|
|
} else {
|
|
int align = 8 - (get_bits_count(gb) & 7);
|
|
align = FFMIN(align, len);
|
|
put_bits(&s->pb, align, get_bits(gb, align));
|
|
len -= align;
|
|
avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
|
|
}
|
|
skip_bits_long(gb, len);
|
|
|
|
tmp = s->pb;
|
|
flush_put_bits(&tmp);
|
|
|
|
init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
|
|
skip_bits(&s->gb, s->frame_offset);
|
|
}
|
|
|
|
static int decode_packet(AVCodecContext *avctx, void *data, int *got_frame_ptr,
|
|
AVPacket* avpkt)
|
|
{
|
|
WmallDecodeCtx *s = avctx->priv_data;
|
|
GetBitContext* gb = &s->pgb;
|
|
const uint8_t* buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
int num_bits_prev_frame, packet_sequence_number, spliced_packet;
|
|
|
|
s->frame->nb_samples = 0;
|
|
|
|
if (!buf_size && s->num_saved_bits > get_bits_count(&s->gb)) {
|
|
s->packet_done = 0;
|
|
if (!decode_frame(s))
|
|
s->num_saved_bits = 0;
|
|
} else if (s->packet_done || s->packet_loss) {
|
|
s->packet_done = 0;
|
|
|
|
if (!buf_size)
|
|
return 0;
|
|
|
|
s->next_packet_start = buf_size - FFMIN(avctx->block_align, buf_size);
|
|
buf_size = FFMIN(avctx->block_align, buf_size);
|
|
s->buf_bit_size = buf_size << 3;
|
|
|
|
/* parse packet header */
|
|
init_get_bits(gb, buf, s->buf_bit_size);
|
|
packet_sequence_number = get_bits(gb, 4);
|
|
skip_bits(gb, 1); // Skip seekable_frame_in_packet, currently unused
|
|
spliced_packet = get_bits1(gb);
|
|
if (spliced_packet)
|
|
avpriv_request_sample(avctx, "Bitstream splicing");
|
|
|
|
/* get number of bits that need to be added to the previous frame */
|
|
num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
|
|
|
|
/* check for packet loss */
|
|
if (!s->packet_loss &&
|
|
((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
|
|
s->packet_loss = 1;
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Packet loss detected! seq %"PRIx8" vs %x\n",
|
|
s->packet_sequence_number, packet_sequence_number);
|
|
}
|
|
s->packet_sequence_number = packet_sequence_number;
|
|
|
|
if (num_bits_prev_frame > 0) {
|
|
int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
|
|
if (num_bits_prev_frame >= remaining_packet_bits) {
|
|
num_bits_prev_frame = remaining_packet_bits;
|
|
s->packet_done = 1;
|
|
}
|
|
|
|
/* Append the previous frame data to the remaining data from the
|
|
* previous packet to create a full frame. */
|
|
save_bits(s, gb, num_bits_prev_frame, 1);
|
|
|
|
/* decode the cross packet frame if it is valid */
|
|
if (num_bits_prev_frame < remaining_packet_bits && !s->packet_loss)
|
|
decode_frame(s);
|
|
} else if (s->num_saved_bits - s->frame_offset) {
|
|
ff_dlog(avctx, "ignoring %x previously saved bits\n",
|
|
s->num_saved_bits - s->frame_offset);
|
|
}
|
|
|
|
if (s->packet_loss) {
|
|
/* Reset number of saved bits so that the decoder does not start
|
|
* to decode incomplete frames in the s->len_prefix == 0 case. */
|
|
s->num_saved_bits = 0;
|
|
s->packet_loss = 0;
|
|
init_put_bits(&s->pb, s->frame_data, s->max_frame_size);
|
|
}
|
|
|
|
} else {
|
|
int frame_size;
|
|
|
|
s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
|
|
init_get_bits(gb, avpkt->data, s->buf_bit_size);
|
|
skip_bits(gb, s->packet_offset);
|
|
|
|
if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
|
|
(frame_size = show_bits(gb, s->log2_frame_size)) &&
|
|
frame_size <= remaining_bits(s, gb)) {
|
|
save_bits(s, gb, frame_size, 0);
|
|
|
|
if (!s->packet_loss)
|
|
s->packet_done = !decode_frame(s);
|
|
} else if (!s->len_prefix
|
|
&& s->num_saved_bits > get_bits_count(&s->gb)) {
|
|
/* when the frames do not have a length prefix, we don't know the
|
|
* compressed length of the individual frames however, we know what
|
|
* part of a new packet belongs to the previous frame therefore we
|
|
* save the incoming packet first, then we append the "previous
|
|
* frame" data from the next packet so that we get a buffer that
|
|
* only contains full frames */
|
|
s->packet_done = !decode_frame(s);
|
|
} else {
|
|
s->packet_done = 1;
|
|
}
|
|
}
|
|
|
|
if (remaining_bits(s, gb) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -remaining_bits(s, gb));
|
|
s->packet_loss = 1;
|
|
}
|
|
|
|
if (s->packet_done && !s->packet_loss &&
|
|
remaining_bits(s, gb) > 0) {
|
|
/* save the rest of the data so that it can be decoded
|
|
* with the next packet */
|
|
save_bits(s, gb, remaining_bits(s, gb), 0);
|
|
}
|
|
|
|
*got_frame_ptr = s->frame->nb_samples > 0;
|
|
av_frame_move_ref(data, s->frame);
|
|
|
|
s->packet_offset = get_bits_count(gb) & 7;
|
|
|
|
return (s->packet_loss) ? AVERROR_INVALIDDATA : buf_size ? get_bits_count(gb) >> 3 : 0;
|
|
}
|
|
|
|
static void flush(AVCodecContext *avctx)
|
|
{
|
|
WmallDecodeCtx *s = avctx->priv_data;
|
|
s->packet_loss = 1;
|
|
s->packet_done = 0;
|
|
s->num_saved_bits = 0;
|
|
s->frame_offset = 0;
|
|
s->next_packet_start = 0;
|
|
s->cdlms[0][0].order = 0;
|
|
s->frame->nb_samples = 0;
|
|
init_put_bits(&s->pb, s->frame_data, s->max_frame_size);
|
|
}
|
|
|
|
static av_cold int decode_close(AVCodecContext *avctx)
|
|
{
|
|
WmallDecodeCtx *s = avctx->priv_data;
|
|
|
|
av_frame_free(&s->frame);
|
|
av_freep(&s->frame_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_wmalossless_decoder = {
|
|
.name = "wmalossless",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio Lossless"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_WMALOSSLESS,
|
|
.priv_data_size = sizeof(WmallDecodeCtx),
|
|
.init = decode_init,
|
|
.close = decode_close,
|
|
.decode = decode_packet,
|
|
.flush = flush,
|
|
.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
|
|
AV_SAMPLE_FMT_S32P,
|
|
AV_SAMPLE_FMT_NONE },
|
|
};
|