LCOV - code coverage report
Current view: top level - libavcodec - mjpega_dump_header_bsf.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 51 0.0 %
Date: 2017-12-17 16:07:53 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /*
       2             :  * MJPEG A dump header bitstream filter
       3             :  * Copyright (c) 2006 Baptiste Coudurier
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * MJPEG A dump header bitstream filter
      25             :  * modifies bitstream to be decoded by quicktime
      26             :  */
      27             : 
      28             : #include "avcodec.h"
      29             : #include "bsf.h"
      30             : #include "bytestream.h"
      31             : #include "mjpeg.h"
      32             : 
      33             : 
      34           0 : static int mjpega_dump_header(AVBSFContext *ctx, AVPacket *out)
      35             : {
      36             :     AVPacket *in;
      37             :     uint8_t *out_buf;
      38           0 :     unsigned dqt = 0, dht = 0, sof0 = 0;
      39           0 :     int ret = 0, i;
      40             : 
      41           0 :     ret = ff_bsf_get_packet(ctx, &in);
      42           0 :     if (ret < 0)
      43           0 :         return ret;
      44             : 
      45           0 :     ret = av_new_packet(out, in->size + 44);
      46           0 :     if (ret < 0)
      47           0 :         goto fail;
      48             : 
      49           0 :     ret = av_packet_copy_props(out, in);
      50           0 :     if (ret < 0)
      51           0 :         goto fail;
      52             : 
      53           0 :     out_buf = out->data;
      54           0 :     bytestream_put_byte(&out_buf, 0xff);
      55           0 :     bytestream_put_byte(&out_buf, SOI);
      56           0 :     bytestream_put_byte(&out_buf, 0xff);
      57           0 :     bytestream_put_byte(&out_buf, APP1);
      58           0 :     bytestream_put_be16(&out_buf, 42); /* size */
      59           0 :     bytestream_put_be32(&out_buf, 0);
      60           0 :     bytestream_put_buffer(&out_buf, "mjpg", 4);
      61           0 :     bytestream_put_be32(&out_buf, in->size + 44); /* field size */
      62           0 :     bytestream_put_be32(&out_buf, in->size + 44); /* pad field size */
      63           0 :     bytestream_put_be32(&out_buf, 0);             /* next ptr */
      64             : 
      65           0 :     for (i = 0; i < in->size - 1; i++) {
      66           0 :         if (in->data[i] == 0xff) {
      67           0 :             switch (in->data[i + 1]) {
      68           0 :             case DQT:  dqt  = i + 46; break;
      69           0 :             case DHT:  dht  = i + 46; break;
      70           0 :             case SOF0: sof0 = i + 46; break;
      71           0 :             case SOS:
      72           0 :                 bytestream_put_be32(&out_buf, dqt); /* quant off */
      73           0 :                 bytestream_put_be32(&out_buf, dht); /* huff off */
      74           0 :                 bytestream_put_be32(&out_buf, sof0); /* image off */
      75           0 :                 bytestream_put_be32(&out_buf, i + 46); /* scan off */
      76           0 :                 bytestream_put_be32(&out_buf, i + 46 + AV_RB16(in->data + i + 2)); /* data off */
      77           0 :                 bytestream_put_buffer(&out_buf, in->data + 2, in->size - 2); /* skip already written SOI */
      78             : 
      79           0 :                 out->size = out_buf - out->data;
      80           0 :                 av_packet_free(&in);
      81           0 :                 return 0;
      82           0 :             case APP1:
      83           0 :                 if (i + 8 < in->size && AV_RL32(in->data + i + 8) == AV_RL32("mjpg")) {
      84           0 :                     av_log(ctx, AV_LOG_ERROR, "bitstream already formatted\n");
      85           0 :                     av_packet_unref(out);
      86           0 :                     av_packet_move_ref(out, in);
      87           0 :                     av_packet_free(&in);
      88           0 :                     return 0;
      89             :                 }
      90             :             }
      91             :         }
      92             :     }
      93           0 :     av_log(ctx, AV_LOG_ERROR, "could not find SOS marker in bitstream\n");
      94           0 : fail:
      95           0 :     av_packet_unref(out);
      96           0 :     av_packet_free(&in);
      97           0 :     return AVERROR_INVALIDDATA;
      98             : }
      99             : 
     100             : static const enum AVCodecID codec_ids[] = {
     101             :     AV_CODEC_ID_MJPEG, AV_CODEC_ID_NONE,
     102             : };
     103             : 
     104             : const AVBitStreamFilter ff_mjpega_dump_header_bsf = {
     105             :     .name      = "mjpegadump",
     106             :     .filter    = mjpega_dump_header,
     107             :     .codec_ids = codec_ids,
     108             : };

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