mirror of
https://github.com/pineappleEA/pineapple-src.git
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205 lines
6.0 KiB
C
Executable File
205 lines
6.0 KiB
C
Executable File
/*
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* HEVC MP4 to Annex B byte stream format filter
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* copyright (c) 2015 Anton Khirnov
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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 <string.h>
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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#include "avcodec.h"
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#include "bsf.h"
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#include "bsf_internal.h"
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#include "bytestream.h"
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#include "hevc.h"
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#define MIN_HEVCC_LENGTH 23
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typedef struct HEVCBSFContext {
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uint8_t length_size;
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int extradata_parsed;
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} HEVCBSFContext;
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static int hevc_extradata_to_annexb(AVBSFContext *ctx)
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{
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GetByteContext gb;
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int length_size, num_arrays, i, j;
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int ret = 0;
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uint8_t *new_extradata = NULL;
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size_t new_extradata_size = 0;
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bytestream2_init(&gb, ctx->par_in->extradata, ctx->par_in->extradata_size);
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bytestream2_skip(&gb, 21);
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length_size = (bytestream2_get_byte(&gb) & 3) + 1;
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num_arrays = bytestream2_get_byte(&gb);
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for (i = 0; i < num_arrays; i++) {
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int type = bytestream2_get_byte(&gb) & 0x3f;
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int cnt = bytestream2_get_be16(&gb);
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if (!(type == HEVC_NAL_VPS || type == HEVC_NAL_SPS || type == HEVC_NAL_PPS ||
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type == HEVC_NAL_SEI_PREFIX || type == HEVC_NAL_SEI_SUFFIX)) {
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av_log(ctx, AV_LOG_ERROR, "Invalid NAL unit type in extradata: %d\n",
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type);
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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for (j = 0; j < cnt; j++) {
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int nalu_len = bytestream2_get_be16(&gb);
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if (4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX - new_extradata_size) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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ret = av_reallocp(&new_extradata, new_extradata_size + nalu_len + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
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if (ret < 0)
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goto fail;
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AV_WB32(new_extradata + new_extradata_size, 1); // add the startcode
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bytestream2_get_buffer(&gb, new_extradata + new_extradata_size + 4, nalu_len);
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new_extradata_size += 4 + nalu_len;
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memset(new_extradata + new_extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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}
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}
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av_freep(&ctx->par_out->extradata);
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ctx->par_out->extradata = new_extradata;
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ctx->par_out->extradata_size = new_extradata_size;
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if (!new_extradata_size)
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av_log(ctx, AV_LOG_WARNING, "No parameter sets in the extradata\n");
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return length_size;
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fail:
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av_freep(&new_extradata);
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return ret;
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}
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static int hevc_mp4toannexb_init(AVBSFContext *ctx)
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{
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HEVCBSFContext *s = ctx->priv_data;
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int ret;
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if (ctx->par_in->extradata_size < MIN_HEVCC_LENGTH ||
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AV_RB24(ctx->par_in->extradata) == 1 ||
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AV_RB32(ctx->par_in->extradata) == 1) {
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av_log(ctx, AV_LOG_VERBOSE,
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"The input looks like it is Annex B already\n");
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} else {
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ret = hevc_extradata_to_annexb(ctx);
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if (ret < 0)
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return ret;
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s->length_size = ret;
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s->extradata_parsed = 1;
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}
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return 0;
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}
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static int hevc_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
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{
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HEVCBSFContext *s = ctx->priv_data;
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AVPacket *in;
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GetByteContext gb;
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int got_irap = 0;
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int i, ret = 0;
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ret = ff_bsf_get_packet(ctx, &in);
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if (ret < 0)
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return ret;
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if (!s->extradata_parsed) {
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av_packet_move_ref(out, in);
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av_packet_free(&in);
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return 0;
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}
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bytestream2_init(&gb, in->data, in->size);
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while (bytestream2_get_bytes_left(&gb)) {
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uint32_t nalu_size = 0;
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int nalu_type;
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int is_irap, add_extradata, extra_size, prev_size;
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if (bytestream2_get_bytes_left(&gb) < s->length_size) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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for (i = 0; i < s->length_size; i++)
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nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb);
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if (nalu_size < 2 || nalu_size > bytestream2_get_bytes_left(&gb)) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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nalu_type = (bytestream2_peek_byte(&gb) >> 1) & 0x3f;
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/* prepend extradata to IRAP frames */
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is_irap = nalu_type >= 16 && nalu_type <= 23;
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add_extradata = is_irap && !got_irap;
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extra_size = add_extradata * ctx->par_out->extradata_size;
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got_irap |= is_irap;
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if (FFMIN(INT_MAX, SIZE_MAX) < 4ULL + nalu_size + extra_size) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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prev_size = out->size;
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ret = av_grow_packet(out, 4 + nalu_size + extra_size);
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if (ret < 0)
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goto fail;
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if (extra_size)
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memcpy(out->data + prev_size, ctx->par_out->extradata, extra_size);
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AV_WB32(out->data + prev_size + extra_size, 1);
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bytestream2_get_buffer(&gb, out->data + prev_size + 4 + extra_size, nalu_size);
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}
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ret = av_packet_copy_props(out, in);
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if (ret < 0)
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goto fail;
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fail:
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if (ret < 0)
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av_packet_unref(out);
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av_packet_free(&in);
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return ret;
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}
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static const enum AVCodecID codec_ids[] = {
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AV_CODEC_ID_HEVC, AV_CODEC_ID_NONE,
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};
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const AVBitStreamFilter ff_hevc_mp4toannexb_bsf = {
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.name = "hevc_mp4toannexb",
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.priv_data_size = sizeof(HEVCBSFContext),
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.init = hevc_mp4toannexb_init,
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.filter = hevc_mp4toannexb_filter,
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.codec_ids = codec_ids,
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};
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