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  1. /*
  2.  * MD5 encoder (for codec/format testing)
  3.  * Copyright (c) 2009 Reimar Döffinger, based on crcenc (c) 2002 Fabrice Bellard
  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. #include "libavutil/avassert.h"
  23. #include "libavutil/avstring.h"
  24. #include "libavutil/hash.h"
  25. #include "libavutil/opt.h"
  26. #include "avformat.h"
  27. #include "internal.h"
  28.  
  29. struct MD5Context {
  30.     const AVClass *avclass;
  31.     struct AVHashContext *hash;
  32.     char *hash_name;
  33. };
  34.  
  35. static void md5_finish(struct AVFormatContext *s, char *buf)
  36. {
  37.     struct MD5Context *c = s->priv_data;
  38.     uint8_t md5[AV_HASH_MAX_SIZE];
  39.     int i, offset = strlen(buf);
  40.     int len = av_hash_get_size(c->hash);
  41.     av_assert0(len > 0 && len <= sizeof(md5));
  42.     av_hash_final(c->hash, md5);
  43.     for (i = 0; i < len; i++) {
  44.         snprintf(buf + offset, 3, "%02"PRIx8, md5[i]);
  45.         offset += 2;
  46.     }
  47.     buf[offset] = '\n';
  48.     buf[offset+1] = 0;
  49.  
  50.     avio_write(s->pb, buf, strlen(buf));
  51.     avio_flush(s->pb);
  52. }
  53.  
  54. #define OFFSET(x) offsetof(struct MD5Context, x)
  55. #define ENC AV_OPT_FLAG_ENCODING_PARAM
  56. static const AVOption hash_options[] = {
  57.     { "hash", "set hash to use", OFFSET(hash_name), AV_OPT_TYPE_STRING, {.str = "md5"}, 0, 0, ENC },
  58.     { NULL },
  59. };
  60.  
  61. static const AVClass md5enc_class = {
  62.     .class_name = "hash encoder class",
  63.     .item_name  = av_default_item_name,
  64.     .option     = hash_options,
  65.     .version    = LIBAVUTIL_VERSION_INT,
  66. };
  67.  
  68. #if CONFIG_MD5_MUXER
  69. static int write_header(struct AVFormatContext *s)
  70. {
  71.     struct MD5Context *c = s->priv_data;
  72.     int res = av_hash_alloc(&c->hash, c->hash_name);
  73.     if (res < 0)
  74.         return res;
  75.     av_hash_init(c->hash);
  76.     return 0;
  77. }
  78.  
  79. static int write_packet(struct AVFormatContext *s, AVPacket *pkt)
  80. {
  81.     struct MD5Context *c = s->priv_data;
  82.     av_hash_update(c->hash, pkt->data, pkt->size);
  83.     return 0;
  84. }
  85.  
  86. static int write_trailer(struct AVFormatContext *s)
  87. {
  88.     struct MD5Context *c = s->priv_data;
  89.     char buf[256];
  90.     av_strlcpy(buf, av_hash_get_name(c->hash), sizeof(buf) - 200);
  91.     av_strlcat(buf, "=", sizeof(buf) - 200);
  92.  
  93.     md5_finish(s, buf);
  94.  
  95.     av_hash_freep(&c->hash);
  96.     return 0;
  97. }
  98.  
  99. AVOutputFormat ff_md5_muxer = {
  100.     .name              = "md5",
  101.     .long_name         = NULL_IF_CONFIG_SMALL("MD5 testing"),
  102.     .priv_data_size    = sizeof(struct MD5Context),
  103.     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
  104.     .video_codec       = AV_CODEC_ID_RAWVIDEO,
  105.     .write_header      = write_header,
  106.     .write_packet      = write_packet,
  107.     .write_trailer     = write_trailer,
  108.     .flags             = AVFMT_NOTIMESTAMPS,
  109.     .priv_class        = &md5enc_class,
  110. };
  111. #endif
  112.  
  113. #if CONFIG_FRAMEMD5_MUXER
  114. static int framemd5_write_header(struct AVFormatContext *s)
  115. {
  116.     struct MD5Context *c = s->priv_data;
  117.     int res = av_hash_alloc(&c->hash, c->hash_name);
  118.     if (res < 0)
  119.         return res;
  120.     avio_printf(s->pb, "#format: frame checksums\n");
  121.     avio_printf(s->pb, "#version: 1\n");
  122.     avio_printf(s->pb, "#hash: %s\n", av_hash_get_name(c->hash));
  123.     ff_framehash_write_header(s);
  124.     avio_printf(s->pb, "#stream#, dts,        pts, duration,     size, hash\n");
  125.     return 0;
  126. }
  127.  
  128. static int framemd5_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  129. {
  130.     struct MD5Context *c = s->priv_data;
  131.     char buf[256];
  132.     av_hash_init(c->hash);
  133.     av_hash_update(c->hash, pkt->data, pkt->size);
  134.  
  135.     snprintf(buf, sizeof(buf) - 64, "%d, %10"PRId64", %10"PRId64", %8d, %8d, ",
  136.              pkt->stream_index, pkt->dts, pkt->pts, pkt->duration, pkt->size);
  137.     md5_finish(s, buf);
  138.     return 0;
  139. }
  140.  
  141. static int framemd5_write_trailer(struct AVFormatContext *s)
  142. {
  143.     struct MD5Context *c = s->priv_data;
  144.     av_hash_freep(&c->hash);
  145.     return 0;
  146. }
  147.  
  148. static const AVClass framemd5_class = {
  149.     .class_name = "frame hash encoder class",
  150.     .item_name  = av_default_item_name,
  151.     .option     = hash_options,
  152.     .version    = LIBAVUTIL_VERSION_INT,
  153. };
  154.  
  155. AVOutputFormat ff_framemd5_muxer = {
  156.     .name              = "framemd5",
  157.     .long_name         = NULL_IF_CONFIG_SMALL("Per-frame MD5 testing"),
  158.     .priv_data_size    = sizeof(struct MD5Context),
  159.     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
  160.     .video_codec       = AV_CODEC_ID_RAWVIDEO,
  161.     .write_header      = framemd5_write_header,
  162.     .write_packet      = framemd5_write_packet,
  163.     .write_trailer     = framemd5_write_trailer,
  164.     .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
  165.                          AVFMT_TS_NEGATIVE,
  166.     .priv_class        = &framemd5_class,
  167. };
  168. #endif
  169.