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/* |
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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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✓✓ |
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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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✓✓✓✓
✗✓✗✗
✗✗ |
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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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✓✓ |
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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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✗✓ |
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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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✗✓ |
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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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✗✓ |
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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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✓✗ |
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if (ctx->par_in->extradata_size < MIN_HEVCC_LENGTH || |
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✓✗ |
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AV_RB24(ctx->par_in->extradata) == 1 || |
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✗✓ |
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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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✗✓ |
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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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✓✓ |
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if (ret < 0) |
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return ret; |
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✗✓ |
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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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✓✓ |
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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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✗✓ |
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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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✓✓ |
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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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✓✗✗✓
|
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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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✓✓✓✓
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is_irap = nalu_type >= 16 && nalu_type <= 23; |
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✓✓✓✗
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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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✗✓ |
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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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✗✓ |
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if (ret < 0) |
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goto fail; |
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✓✓ |
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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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✓✗ |
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if (ret < 0) |
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goto fail; |
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fail: |
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✗✓ |
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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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}; |