GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/hevc_mp4toannexb_bsf.c Lines: 70 94 74.5 %
Date: 2020-09-21 17:35:45 Branches: 39 60 65.0 %

Line Branch Exec Source
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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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1
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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1
    int ret = 0;
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46
1
    uint8_t *new_extradata = NULL;
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1
    size_t   new_extradata_size = 0;
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49
1
    bytestream2_init(&gb, ctx->par_in->extradata, ctx->par_in->extradata_size);
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51
1
    bytestream2_skip(&gb, 21);
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1
    length_size = (bytestream2_get_byte(&gb) & 3) + 1;
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1
    num_arrays  = bytestream2_get_byte(&gb);
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4
    for (i = 0; i < num_arrays; i++) {
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3
        int type = bytestream2_get_byte(&gb) & 0x3f;
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3
        int cnt  = bytestream2_get_be16(&gb);
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59


3
        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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6
        for (j = 0; j < cnt; j++) {
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3
            int nalu_len = bytestream2_get_be16(&gb);
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3
            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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3
            ret = av_reallocp(&new_extradata, new_extradata_size + nalu_len + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
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3
            if (ret < 0)
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                goto fail;
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3
            AV_WB32(new_extradata + new_extradata_size, 1); // add the startcode
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3
            bytestream2_get_buffer(&gb, new_extradata + new_extradata_size + 4, nalu_len);
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3
            new_extradata_size += 4 + nalu_len;
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3
            memset(new_extradata + new_extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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        }
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    }
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1
    av_freep(&ctx->par_out->extradata);
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1
    ctx->par_out->extradata      = new_extradata;
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1
    ctx->par_out->extradata_size = new_extradata_size;
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1
    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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1
    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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1
static int hevc_mp4toannexb_init(AVBSFContext *ctx)
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{
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1
    HEVCBSFContext *s = ctx->priv_data;
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    int ret;
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1
    if (ctx->par_in->extradata_size < MIN_HEVCC_LENGTH ||
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1
        AV_RB24(ctx->par_in->extradata) == 1           ||
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1
        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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1
        ret = hevc_extradata_to_annexb(ctx);
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1
        if (ret < 0)
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            return ret;
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1
        s->length_size      = ret;
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1
        s->extradata_parsed = 1;
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    }
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1
    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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97
    HEVCBSFContext *s = ctx->priv_data;
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    AVPacket *in;
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    GetByteContext gb;
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125
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    int got_irap = 0;
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97
    int i, ret = 0;
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128
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    ret = ff_bsf_get_packet(ctx, &in);
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97
    if (ret < 0)
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49
        return ret;
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132
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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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138
48
    bytestream2_init(&gb, in->data, in->size);
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140
430
    while (bytestream2_get_bytes_left(&gb)) {
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382
        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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145
382
        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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1910
        for (i = 0; i < s->length_size; i++)
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1528
            nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb);
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152

382
        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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157
382
        nalu_type = (bytestream2_peek_byte(&gb) >> 1) & 0x3f;
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159
        /* prepend extradata to IRAP frames */
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382
        is_irap       = nalu_type >= 16 && nalu_type <= 23;
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382
        add_extradata = is_irap && !got_irap;
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382
        extra_size    = add_extradata * ctx->par_out->extradata_size;
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382
        got_irap     |= is_irap;
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165
382
        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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170
382
        prev_size = out->size;
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172
382
        ret = av_grow_packet(out, 4 + nalu_size + extra_size);
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382
        if (ret < 0)
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            goto fail;
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176
382
        if (extra_size)
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1
            memcpy(out->data + prev_size, ctx->par_out->extradata, extra_size);
178
382
        AV_WB32(out->data + prev_size + extra_size, 1);
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382
        bytestream2_get_buffer(&gb, out->data + prev_size + 4 + extra_size, nalu_size);
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    }
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182
48
    ret = av_packet_copy_props(out, in);
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48
    if (ret < 0)
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        goto fail;
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186
48
fail:
187
48
    if (ret < 0)
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        av_packet_unref(out);
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48
    av_packet_free(&in);
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191
48
    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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};