GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mjpega_dump_header_bsf.c Lines: 0 51 0.0 %
Date: 2019-11-22 03:34:36 Branches: 0 20 0.0 %

Line Branch Exec Source
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/*
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 * MJPEG A dump header bitstream filter
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 * Copyright (c) 2006 Baptiste Coudurier
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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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 * MJPEG A dump header bitstream filter
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 * modifies bitstream to be decoded by quicktime
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 */
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#include "avcodec.h"
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#include "bsf.h"
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#include "bytestream.h"
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#include "mjpeg.h"
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static int mjpega_dump_header(AVBSFContext *ctx, AVPacket *out)
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{
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    AVPacket *in;
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    uint8_t *out_buf;
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    unsigned dqt = 0, dht = 0, sof0 = 0;
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    int ret = 0, i;
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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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    ret = av_new_packet(out, in->size + 44);
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    if (ret < 0)
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        goto fail;
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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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    out_buf = out->data;
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    bytestream_put_byte(&out_buf, 0xff);
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    bytestream_put_byte(&out_buf, SOI);
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    bytestream_put_byte(&out_buf, 0xff);
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    bytestream_put_byte(&out_buf, APP1);
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    bytestream_put_be16(&out_buf, 42); /* size */
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    bytestream_put_be32(&out_buf, 0);
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    bytestream_put_buffer(&out_buf, "mjpg", 4);
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    bytestream_put_be32(&out_buf, in->size + 44); /* field size */
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    bytestream_put_be32(&out_buf, in->size + 44); /* pad field size */
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    bytestream_put_be32(&out_buf, 0);             /* next ptr */
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    for (i = 0; i < in->size - 1; i++) {
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        if (in->data[i] == 0xff) {
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            switch (in->data[i + 1]) {
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            case DQT:  dqt  = i + 46; break;
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            case DHT:  dht  = i + 46; break;
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            case SOF0: sof0 = i + 46; break;
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            case SOS:
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                bytestream_put_be32(&out_buf, dqt); /* quant off */
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                bytestream_put_be32(&out_buf, dht); /* huff off */
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                bytestream_put_be32(&out_buf, sof0); /* image off */
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                bytestream_put_be32(&out_buf, i + 46); /* scan off */
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                bytestream_put_be32(&out_buf, i + 46 + AV_RB16(in->data + i + 2)); /* data off */
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                bytestream_put_buffer(&out_buf, in->data + 2, in->size - 2); /* skip already written SOI */
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                out->size = out_buf - out->data;
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                av_packet_free(&in);
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                return 0;
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            case APP1:
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                if (i + 8 < in->size && AV_RL32(in->data + i + 8) == AV_RL32("mjpg")) {
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                    av_log(ctx, AV_LOG_ERROR, "bitstream already formatted\n");
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                    av_packet_unref(out);
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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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            }
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        }
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    }
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    av_log(ctx, AV_LOG_ERROR, "could not find SOS marker in bitstream\n");
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fail:
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    av_packet_unref(out);
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    av_packet_free(&in);
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    return AVERROR_INVALIDDATA;
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}
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static const enum AVCodecID codec_ids[] = {
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    AV_CODEC_ID_MJPEG, AV_CODEC_ID_NONE,
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};
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const AVBitStreamFilter ff_mjpega_dump_header_bsf = {
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    .name      = "mjpegadump",
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    .filter    = mjpega_dump_header,
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    .codec_ids = codec_ids,
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};