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687 lines
24 KiB
C
Executable File
687 lines
24 KiB
C
Executable File
/*
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* IEC 61937 muxer
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* Copyright (c) 2009 Bartlomiej Wolowiec
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* Copyright (c) 2010, 2020 Anssi Hannula
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* Copyright (c) 2010 Carl Eugen Hoyos
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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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/**
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* @file
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* IEC-61937 encapsulation of various formats, used by S/PDIF
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* @author Bartlomiej Wolowiec
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* @author Anssi Hannula
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* @author Carl Eugen Hoyos
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*/
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/*
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* Terminology used in specification:
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* data-burst - IEC61937 frame, contains header and encapsuled frame
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* burst-preamble - IEC61937 frame header, contains 16-bit words named Pa, Pb, Pc and Pd
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* burst-payload - encapsuled frame
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* Pa, Pb - syncword - 0xF872, 0x4E1F
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* Pc - burst-info, contains data-type (bits 0-6), error flag (bit 7), data-type-dependent info (bits 8-12)
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* and bitstream number (bits 13-15)
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* data-type - determines type of encapsuled frames
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* Pd - length code (number of bits or bytes of encapsuled frame - according to data_type)
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*
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* IEC 61937 frames at normal usage start every specific count of bytes,
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* dependent from data-type (spaces between packets are filled by zeros)
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*/
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#include <inttypes.h>
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#include "avformat.h"
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#include "avio_internal.h"
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#include "spdif.h"
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#include "libavcodec/ac3.h"
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#include "libavcodec/adts_parser.h"
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#include "libavcodec/dca.h"
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#include "libavcodec/dca_syncwords.h"
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#include "libavutil/opt.h"
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typedef struct IEC61937Context {
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const AVClass *av_class;
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enum IEC61937DataType data_type;///< burst info - reference to type of payload of the data-burst
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int length_code; ///< length code in bits or bytes, depending on data type
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int pkt_offset; ///< data burst repetition period in bytes
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uint8_t *buffer; ///< allocated buffer, used for swap bytes
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int buffer_size; ///< size of allocated buffer
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uint8_t *out_buf; ///< pointer to the outgoing data before byte-swapping
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int out_bytes; ///< amount of outgoing bytes
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int use_preamble; ///< preamble enabled (disabled for exactly pre-padded DTS)
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int extra_bswap; ///< extra bswap for payload (for LE DTS => standard BE DTS)
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uint8_t *hd_buf[2]; ///< allocated buffers to concatenate hd audio frames
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int hd_buf_size; ///< size of the hd audio buffer (eac3, dts4)
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int hd_buf_count; ///< number of frames in the hd audio buffer (eac3)
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int hd_buf_filled; ///< amount of bytes in the hd audio buffer (eac3, truehd)
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int hd_buf_idx; ///< active hd buffer index (truehd)
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int dtshd_skip; ///< counter used for skipping DTS-HD frames
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uint16_t truehd_prev_time; ///< input_timing from the last frame
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int truehd_prev_size; ///< previous frame size in bytes, including any MAT codes
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int truehd_samples_per_frame; ///< samples per frame for padding calculation
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/* AVOptions: */
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int dtshd_rate;
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int dtshd_fallback;
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#define SPDIF_FLAG_BIGENDIAN 0x01
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int spdif_flags;
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/// function, which generates codec dependent header information.
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/// Sets data_type and pkt_offset, and length_code, out_bytes, out_buf if necessary
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int (*header_info) (AVFormatContext *s, AVPacket *pkt);
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} IEC61937Context;
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static const AVOption options[] = {
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{ "spdif_flags", "IEC 61937 encapsulation flags", offsetof(IEC61937Context, spdif_flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
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{ "be", "output in big-endian format (for use as s16be)", 0, AV_OPT_TYPE_CONST, {.i64 = SPDIF_FLAG_BIGENDIAN}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
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{ "dtshd_rate", "mux complete DTS frames in HD mode at the specified IEC958 rate (in Hz, default 0=disabled)", offsetof(IEC61937Context, dtshd_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 768000, AV_OPT_FLAG_ENCODING_PARAM },
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{ "dtshd_fallback_time", "min secs to strip HD for after an overflow (-1: till the end, default 60)", offsetof(IEC61937Context, dtshd_fallback), AV_OPT_TYPE_INT, {.i64 = 60}, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
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{ NULL },
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};
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static const AVClass spdif_class = {
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.class_name = "spdif",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt)
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{
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IEC61937Context *ctx = s->priv_data;
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int bitstream_mode = pkt->data[5] & 0x7;
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ctx->data_type = IEC61937_AC3 | (bitstream_mode << 8);
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ctx->pkt_offset = AC3_FRAME_SIZE << 2;
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return 0;
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}
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static int spdif_header_eac3(AVFormatContext *s, AVPacket *pkt)
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{
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IEC61937Context *ctx = s->priv_data;
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static const uint8_t eac3_repeat[4] = {6, 3, 2, 1};
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int repeat = 1;
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int bsid = pkt->data[5] >> 3;
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if (bsid > 10 && (pkt->data[4] & 0xc0) != 0xc0) /* fscod */
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repeat = eac3_repeat[(pkt->data[4] & 0x30) >> 4]; /* numblkscod */
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ctx->hd_buf[0] = av_fast_realloc(ctx->hd_buf[0], &ctx->hd_buf_size, ctx->hd_buf_filled + pkt->size);
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if (!ctx->hd_buf[0])
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return AVERROR(ENOMEM);
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memcpy(&ctx->hd_buf[0][ctx->hd_buf_filled], pkt->data, pkt->size);
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ctx->hd_buf_filled += pkt->size;
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if (++ctx->hd_buf_count < repeat){
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ctx->pkt_offset = 0;
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return 0;
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}
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ctx->data_type = IEC61937_EAC3;
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ctx->pkt_offset = 24576;
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ctx->out_buf = ctx->hd_buf[0];
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ctx->out_bytes = ctx->hd_buf_filled;
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ctx->length_code = ctx->hd_buf_filled;
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ctx->hd_buf_count = 0;
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ctx->hd_buf_filled = 0;
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return 0;
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}
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/*
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* DTS type IV (DTS-HD) can be transmitted with various frame repetition
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* periods; longer repetition periods allow for longer packets and therefore
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* higher bitrate. Longer repetition periods mean that the constant bitrate of
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* the output IEC 61937 stream is higher.
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* The repetition period is measured in IEC 60958 frames (4 bytes).
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*/
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static int spdif_dts4_subtype(int period)
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{
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switch (period) {
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case 512: return 0x0;
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case 1024: return 0x1;
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case 2048: return 0x2;
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case 4096: return 0x3;
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case 8192: return 0x4;
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case 16384: return 0x5;
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}
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return -1;
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}
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static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size,
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int sample_rate, int blocks)
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{
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IEC61937Context *ctx = s->priv_data;
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static const char dtshd_start_code[10] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe };
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int pkt_size = pkt->size;
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int period;
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int subtype;
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if (!core_size) {
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av_log(s, AV_LOG_ERROR, "HD mode not supported for this format\n");
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return AVERROR(EINVAL);
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}
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if (!sample_rate) {
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av_log(s, AV_LOG_ERROR, "Unknown DTS sample rate for HD\n");
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return AVERROR_INVALIDDATA;
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}
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period = ctx->dtshd_rate * (blocks << 5) / sample_rate;
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subtype = spdif_dts4_subtype(period);
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if (subtype < 0) {
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av_log(s, AV_LOG_ERROR, "Specified HD rate of %d Hz would require an "
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"impossible repetition period of %d for the current DTS stream"
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" (blocks = %d, sample rate = %d)\n", ctx->dtshd_rate, period,
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blocks << 5, sample_rate);
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return AVERROR(EINVAL);
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}
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/* set pkt_offset and DTS IV subtype according to the requested output
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* rate */
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ctx->pkt_offset = period * 4;
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ctx->data_type = IEC61937_DTSHD | subtype << 8;
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/* If the bitrate is too high for transmitting at the selected
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* repetition period setting, strip DTS-HD until a good amount
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* of consecutive non-overflowing HD frames have been observed.
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* This generally only happens if the caller is cramming a Master
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* Audio stream into 192kHz IEC 60958 (which may or may not fit). */
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if (sizeof(dtshd_start_code) + 2 + pkt_size
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> ctx->pkt_offset - BURST_HEADER_SIZE && core_size) {
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if (!ctx->dtshd_skip)
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av_log(s, AV_LOG_WARNING, "DTS-HD bitrate too high, "
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"temporarily sending core only\n");
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if (ctx->dtshd_fallback > 0)
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ctx->dtshd_skip = sample_rate * ctx->dtshd_fallback / (blocks << 5);
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else
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/* skip permanently (dtshd_fallback == -1) or just once
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* (dtshd_fallback == 0) */
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ctx->dtshd_skip = 1;
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}
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if (ctx->dtshd_skip && core_size) {
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pkt_size = core_size;
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if (ctx->dtshd_fallback >= 0)
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--ctx->dtshd_skip;
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}
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ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size;
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/* Align so that (length_code & 0xf) == 0x8. This is reportedly needed
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* with some receivers, but the exact requirement is unconfirmed. */
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ctx->length_code = FFALIGN(ctx->out_bytes + 0x8, 0x10) - 0x8;
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av_fast_malloc(&ctx->hd_buf[0], &ctx->hd_buf_size, ctx->out_bytes);
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if (!ctx->hd_buf[0])
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return AVERROR(ENOMEM);
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ctx->out_buf = ctx->hd_buf[0];
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memcpy(ctx->hd_buf[0], dtshd_start_code, sizeof(dtshd_start_code));
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AV_WB16(ctx->hd_buf[0] + sizeof(dtshd_start_code), pkt_size);
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memcpy(ctx->hd_buf[0] + sizeof(dtshd_start_code) + 2, pkt->data, pkt_size);
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return 0;
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}
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static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
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{
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IEC61937Context *ctx = s->priv_data;
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uint32_t syncword_dts = AV_RB32(pkt->data);
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int blocks;
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int sample_rate = 0;
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int core_size = 0;
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if (pkt->size < 9)
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return AVERROR_INVALIDDATA;
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switch (syncword_dts) {
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case DCA_SYNCWORD_CORE_BE:
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blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f;
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core_size = ((AV_RB24(pkt->data + 5) >> 4) & 0x3fff) + 1;
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sample_rate = avpriv_dca_sample_rates[(pkt->data[8] >> 2) & 0x0f];
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break;
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case DCA_SYNCWORD_CORE_LE:
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blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f;
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ctx->extra_bswap = 1;
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break;
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case DCA_SYNCWORD_CORE_14B_BE:
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blocks =
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(((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2));
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break;
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case DCA_SYNCWORD_CORE_14B_LE:
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blocks =
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(((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2));
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ctx->extra_bswap = 1;
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break;
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case DCA_SYNCWORD_SUBSTREAM:
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/* We only handle HD frames that are paired with core. However,
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sometimes DTS-HD streams with core have a stray HD frame without
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core in the beginning of the stream. */
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av_log(s, AV_LOG_ERROR, "stray DTS-HD frame\n");
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return AVERROR_INVALIDDATA;
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default:
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av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%"PRIx32"\n", syncword_dts);
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return AVERROR_INVALIDDATA;
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}
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blocks++;
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if (ctx->dtshd_rate)
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/* DTS type IV output requested */
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return spdif_header_dts4(s, pkt, core_size, sample_rate, blocks);
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switch (blocks) {
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case 512 >> 5: ctx->data_type = IEC61937_DTS1; break;
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case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break;
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case 2048 >> 5: ctx->data_type = IEC61937_DTS3; break;
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default:
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av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n",
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blocks << 5);
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return AVERROR(ENOSYS);
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}
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/* discard extraneous data by default */
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if (core_size && core_size < pkt->size) {
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ctx->out_bytes = core_size;
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ctx->length_code = core_size << 3;
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}
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ctx->pkt_offset = blocks << 7;
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if (ctx->out_bytes == ctx->pkt_offset) {
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/* The DTS stream fits exactly into the output stream, so skip the
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* preamble as it would not fit in there. This is the case for dts
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* discs and dts-in-wav. */
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ctx->use_preamble = 0;
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} else if (ctx->out_bytes > ctx->pkt_offset - BURST_HEADER_SIZE) {
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avpriv_request_sample(s, "Unrecognized large DTS frame");
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/* This will fail with a "bitrate too high" in the caller */
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}
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return 0;
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}
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static const enum IEC61937DataType mpeg_data_type[2][3] = {
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// LAYER1 LAYER2 LAYER3
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{ IEC61937_MPEG2_LAYER1_LSF, IEC61937_MPEG2_LAYER2_LSF, IEC61937_MPEG2_LAYER3_LSF }, // MPEG-2 LSF
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{ IEC61937_MPEG1_LAYER1, IEC61937_MPEG1_LAYER23, IEC61937_MPEG1_LAYER23 }, // MPEG-1
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};
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static int spdif_header_mpeg(AVFormatContext *s, AVPacket *pkt)
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{
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IEC61937Context *ctx = s->priv_data;
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int version = (pkt->data[1] >> 3) & 3;
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int layer = 3 - ((pkt->data[1] >> 1) & 3);
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int extension = pkt->data[2] & 1;
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if (layer == 3 || version == 1) {
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av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n");
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return AVERROR_INVALIDDATA;
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}
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av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension);
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if (version == 2 && extension) {
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ctx->data_type = IEC61937_MPEG2_EXT;
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ctx->pkt_offset = 4608;
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} else {
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ctx->data_type = mpeg_data_type [version & 1][layer];
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ctx->pkt_offset = spdif_mpeg_pkt_offset[version & 1][layer];
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}
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// TODO Data type dependent info (normal/karaoke, dynamic range control)
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return 0;
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}
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static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt)
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{
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IEC61937Context *ctx = s->priv_data;
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uint32_t samples;
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uint8_t frames;
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int ret;
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ret = av_adts_header_parse(pkt->data, &samples, &frames);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n");
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return ret;
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}
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ctx->pkt_offset = samples << 2;
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switch (frames) {
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case 1:
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ctx->data_type = IEC61937_MPEG2_AAC;
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break;
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case 2:
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ctx->data_type = IEC61937_MPEG2_AAC_LSF_2048;
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break;
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case 4:
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ctx->data_type = IEC61937_MPEG2_AAC_LSF_4096;
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break;
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default:
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av_log(s, AV_LOG_ERROR,
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"%"PRIu32" samples in AAC frame not supported\n", samples);
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return AVERROR(EINVAL);
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}
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//TODO Data type dependent info (LC profile/SBR)
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return 0;
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}
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/*
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* It seems Dolby TrueHD frames have to be encapsulated in MAT frames before
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* they can be encapsulated in IEC 61937.
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*/
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#define MAT_PKT_OFFSET 61440
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#define MAT_FRAME_SIZE 61424
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static const uint8_t mat_start_code[20] = {
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0x07, 0x9E, 0x00, 0x03, 0x84, 0x01, 0x01, 0x01, 0x80, 0x00, 0x56, 0xA5, 0x3B, 0xF4, 0x81, 0x83,
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0x49, 0x80, 0x77, 0xE0,
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};
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static const uint8_t mat_middle_code[12] = {
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0xC3, 0xC1, 0x42, 0x49, 0x3B, 0xFA, 0x82, 0x83, 0x49, 0x80, 0x77, 0xE0,
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};
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static const uint8_t mat_end_code[16] = {
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0xC3, 0xC2, 0xC0, 0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x11,
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};
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#define MAT_CODE(position, data) { .pos = position, .code = data, .len = sizeof(data) }
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static const struct {
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unsigned int pos;
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const uint8_t *code;
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unsigned int len;
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} mat_codes[] = {
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MAT_CODE(0, mat_start_code),
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MAT_CODE(30708, mat_middle_code),
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MAT_CODE(MAT_FRAME_SIZE - sizeof(mat_end_code), mat_end_code),
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};
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static int spdif_header_truehd(AVFormatContext *s, AVPacket *pkt)
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{
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IEC61937Context *ctx = s->priv_data;
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uint8_t *hd_buf = ctx->hd_buf[ctx->hd_buf_idx];
|
|
int ratebits;
|
|
int padding_remaining = 0;
|
|
uint16_t input_timing;
|
|
int total_frame_size = pkt->size;
|
|
const uint8_t *dataptr = pkt->data;
|
|
int data_remaining = pkt->size;
|
|
int have_pkt = 0;
|
|
int next_code_idx;
|
|
|
|
if (pkt->size < 10)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (AV_RB24(pkt->data + 4) == 0xf8726f) {
|
|
/* major sync unit, fetch sample rate */
|
|
if (pkt->data[7] == 0xba)
|
|
ratebits = pkt->data[8] >> 4;
|
|
else if (pkt->data[7] == 0xbb)
|
|
ratebits = pkt->data[9] >> 4;
|
|
else
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ctx->truehd_samples_per_frame = 40 << (ratebits & 3);
|
|
av_log(s, AV_LOG_TRACE, "TrueHD samples per frame: %d\n",
|
|
ctx->truehd_samples_per_frame);
|
|
}
|
|
|
|
if (!ctx->truehd_samples_per_frame)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
input_timing = AV_RB16(pkt->data + 2);
|
|
if (ctx->truehd_prev_size) {
|
|
uint16_t delta_samples = input_timing - ctx->truehd_prev_time;
|
|
/*
|
|
* One multiple-of-48kHz frame is 1/1200 sec and the IEC 61937 rate
|
|
* is 768kHz = 768000*4 bytes/sec.
|
|
* The nominal space per frame is therefore
|
|
* (768000*4 bytes/sec) * (1/1200 sec) = 2560 bytes.
|
|
* For multiple-of-44.1kHz frames: 1/1102.5 sec, 705.6kHz, 2560 bytes.
|
|
*
|
|
* 2560 is divisible by truehd_samples_per_frame.
|
|
*/
|
|
int delta_bytes = delta_samples * 2560 / ctx->truehd_samples_per_frame;
|
|
|
|
/* padding needed before this frame */
|
|
padding_remaining = delta_bytes - ctx->truehd_prev_size;
|
|
|
|
av_log(s, AV_LOG_TRACE, "delta_samples: %"PRIu16", delta_bytes: %d\n",
|
|
delta_samples, delta_bytes);
|
|
|
|
/* sanity check */
|
|
if (padding_remaining < 0 || padding_remaining >= MAT_FRAME_SIZE / 2) {
|
|
avpriv_request_sample(s, "Unusual frame timing: %"PRIu16" => %"PRIu16", %d samples/frame",
|
|
ctx->truehd_prev_time, input_timing, ctx->truehd_samples_per_frame);
|
|
padding_remaining = 0;
|
|
}
|
|
}
|
|
|
|
for (next_code_idx = 0; next_code_idx < FF_ARRAY_ELEMS(mat_codes); next_code_idx++)
|
|
if (ctx->hd_buf_filled <= mat_codes[next_code_idx].pos)
|
|
break;
|
|
|
|
if (next_code_idx >= FF_ARRAY_ELEMS(mat_codes))
|
|
return AVERROR_BUG;
|
|
|
|
while (padding_remaining || data_remaining ||
|
|
mat_codes[next_code_idx].pos == ctx->hd_buf_filled) {
|
|
|
|
if (mat_codes[next_code_idx].pos == ctx->hd_buf_filled) {
|
|
/* time to insert MAT code */
|
|
int code_len = mat_codes[next_code_idx].len;
|
|
int code_len_remaining = code_len;
|
|
memcpy(hd_buf + mat_codes[next_code_idx].pos,
|
|
mat_codes[next_code_idx].code, code_len);
|
|
ctx->hd_buf_filled += code_len;
|
|
|
|
next_code_idx++;
|
|
if (next_code_idx == FF_ARRAY_ELEMS(mat_codes)) {
|
|
next_code_idx = 0;
|
|
|
|
/* this was the last code, move to the next MAT frame */
|
|
have_pkt = 1;
|
|
ctx->out_buf = hd_buf;
|
|
ctx->hd_buf_idx ^= 1;
|
|
hd_buf = ctx->hd_buf[ctx->hd_buf_idx];
|
|
ctx->hd_buf_filled = 0;
|
|
|
|
/* inter-frame gap has to be counted as well, add it */
|
|
code_len_remaining += MAT_PKT_OFFSET - MAT_FRAME_SIZE;
|
|
}
|
|
|
|
if (padding_remaining) {
|
|
/* consider the MAT code as padding */
|
|
int counted_as_padding = FFMIN(padding_remaining,
|
|
code_len_remaining);
|
|
padding_remaining -= counted_as_padding;
|
|
code_len_remaining -= counted_as_padding;
|
|
}
|
|
/* count the remainder of the code as part of frame size */
|
|
if (code_len_remaining)
|
|
total_frame_size += code_len_remaining;
|
|
}
|
|
|
|
if (padding_remaining) {
|
|
int padding_to_insert = FFMIN(mat_codes[next_code_idx].pos - ctx->hd_buf_filled,
|
|
padding_remaining);
|
|
|
|
memset(hd_buf + ctx->hd_buf_filled, 0, padding_to_insert);
|
|
ctx->hd_buf_filled += padding_to_insert;
|
|
padding_remaining -= padding_to_insert;
|
|
|
|
if (padding_remaining)
|
|
continue; /* time to insert MAT code */
|
|
}
|
|
|
|
if (data_remaining) {
|
|
int data_to_insert = FFMIN(mat_codes[next_code_idx].pos - ctx->hd_buf_filled,
|
|
data_remaining);
|
|
|
|
memcpy(hd_buf + ctx->hd_buf_filled, dataptr, data_to_insert);
|
|
ctx->hd_buf_filled += data_to_insert;
|
|
dataptr += data_to_insert;
|
|
data_remaining -= data_to_insert;
|
|
}
|
|
}
|
|
|
|
ctx->truehd_prev_size = total_frame_size;
|
|
ctx->truehd_prev_time = input_timing;
|
|
|
|
av_log(s, AV_LOG_TRACE, "TrueHD frame inserted, total size %d, buffer position %d\n",
|
|
total_frame_size, ctx->hd_buf_filled);
|
|
|
|
if (!have_pkt) {
|
|
ctx->pkt_offset = 0;
|
|
return 0;
|
|
}
|
|
|
|
ctx->data_type = IEC61937_TRUEHD;
|
|
ctx->pkt_offset = MAT_PKT_OFFSET;
|
|
ctx->out_bytes = MAT_FRAME_SIZE;
|
|
ctx->length_code = MAT_FRAME_SIZE;
|
|
return 0;
|
|
}
|
|
|
|
static int spdif_write_header(AVFormatContext *s)
|
|
{
|
|
IEC61937Context *ctx = s->priv_data;
|
|
|
|
switch (s->streams[0]->codecpar->codec_id) {
|
|
case AV_CODEC_ID_AC3:
|
|
ctx->header_info = spdif_header_ac3;
|
|
break;
|
|
case AV_CODEC_ID_EAC3:
|
|
ctx->header_info = spdif_header_eac3;
|
|
break;
|
|
case AV_CODEC_ID_MP1:
|
|
case AV_CODEC_ID_MP2:
|
|
case AV_CODEC_ID_MP3:
|
|
ctx->header_info = spdif_header_mpeg;
|
|
break;
|
|
case AV_CODEC_ID_DTS:
|
|
ctx->header_info = spdif_header_dts;
|
|
break;
|
|
case AV_CODEC_ID_AAC:
|
|
ctx->header_info = spdif_header_aac;
|
|
break;
|
|
case AV_CODEC_ID_TRUEHD:
|
|
case AV_CODEC_ID_MLP:
|
|
ctx->header_info = spdif_header_truehd;
|
|
for (int i = 0; i < FF_ARRAY_ELEMS(ctx->hd_buf); i++) {
|
|
ctx->hd_buf[i] = av_malloc(MAT_FRAME_SIZE);
|
|
if (!ctx->hd_buf[i])
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
break;
|
|
default:
|
|
avpriv_report_missing_feature(s, "Codec %d",
|
|
s->streams[0]->codecpar->codec_id);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void spdif_deinit(AVFormatContext *s)
|
|
{
|
|
IEC61937Context *ctx = s->priv_data;
|
|
av_freep(&ctx->buffer);
|
|
for (int i = 0; i < FF_ARRAY_ELEMS(ctx->hd_buf); i++)
|
|
av_freep(&ctx->hd_buf[i]);
|
|
}
|
|
|
|
static av_always_inline void spdif_put_16(IEC61937Context *ctx,
|
|
AVIOContext *pb, unsigned int val)
|
|
{
|
|
if (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)
|
|
avio_wb16(pb, val);
|
|
else
|
|
avio_wl16(pb, val);
|
|
}
|
|
|
|
static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
IEC61937Context *ctx = s->priv_data;
|
|
int ret, padding;
|
|
|
|
ctx->out_buf = pkt->data;
|
|
ctx->out_bytes = pkt->size;
|
|
ctx->length_code = FFALIGN(pkt->size, 2) << 3;
|
|
ctx->use_preamble = 1;
|
|
ctx->extra_bswap = 0;
|
|
|
|
ret = ctx->header_info(s, pkt);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (!ctx->pkt_offset)
|
|
return 0;
|
|
|
|
padding = (ctx->pkt_offset - ctx->use_preamble * BURST_HEADER_SIZE - ctx->out_bytes) & ~1;
|
|
if (padding < 0) {
|
|
av_log(s, AV_LOG_ERROR, "bitrate is too high\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (ctx->use_preamble) {
|
|
spdif_put_16(ctx, s->pb, SYNCWORD1); //Pa
|
|
spdif_put_16(ctx, s->pb, SYNCWORD2); //Pb
|
|
spdif_put_16(ctx, s->pb, ctx->data_type); //Pc
|
|
spdif_put_16(ctx, s->pb, ctx->length_code);//Pd
|
|
}
|
|
|
|
if (ctx->extra_bswap ^ (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)) {
|
|
avio_write(s->pb, ctx->out_buf, ctx->out_bytes & ~1);
|
|
} else {
|
|
av_fast_malloc(&ctx->buffer, &ctx->buffer_size, ctx->out_bytes + AV_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!ctx->buffer)
|
|
return AVERROR(ENOMEM);
|
|
ff_spdif_bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)ctx->out_buf, ctx->out_bytes >> 1);
|
|
avio_write(s->pb, ctx->buffer, ctx->out_bytes & ~1);
|
|
}
|
|
|
|
/* a final lone byte has to be MSB aligned */
|
|
if (ctx->out_bytes & 1)
|
|
spdif_put_16(ctx, s->pb, ctx->out_buf[ctx->out_bytes - 1] << 8);
|
|
|
|
ffio_fill(s->pb, 0, padding);
|
|
|
|
av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n",
|
|
ctx->data_type, ctx->out_bytes, ctx->pkt_offset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_spdif_muxer = {
|
|
.name = "spdif",
|
|
.long_name = NULL_IF_CONFIG_SMALL("IEC 61937 (used on S/PDIF - IEC958)"),
|
|
.extensions = "spdif",
|
|
.priv_data_size = sizeof(IEC61937Context),
|
|
.audio_codec = AV_CODEC_ID_AC3,
|
|
.video_codec = AV_CODEC_ID_NONE,
|
|
.write_header = spdif_write_header,
|
|
.write_packet = spdif_write_packet,
|
|
.deinit = spdif_deinit,
|
|
.flags = AVFMT_NOTIMESTAMPS,
|
|
.priv_class = &spdif_class,
|
|
};
|