/*
  * MD5 encoder (for codec/format testing)
  * Copyright (c) 2009 Reimar Döffinger, based on crcenc (c) 2002 Fabrice Bellard
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #include "libavutil/avassert.h"
 #include "libavutil/avstring.h"
 #include "libavutil/hash.h"
 #include "libavutil/opt.h"

 #include "avformat.h"

 #include "internal.h"

 struct MD5Context {

     const AVClass *avclass;
     struct AVHashContext *hash;
     char *hash_name;

 };

 static void md5_finish(struct AVFormatContext *s, char *buf)
 {

     struct MD5Context *c = s->priv_data;

     uint8_t md5[AV_HASH_MAX_SIZE];

     int i, offset = strlen(buf);

     int len = av_hash_get_size(c->hash);
     av_assert0(len > 0 && len <= sizeof(md5));
     av_hash_final(c->hash, md5);
     for (i = 0; i < len; i++) {

         snprintf(buf + offset, 3, "%02"PRIx8, md5[i]);
         offset += 2;
     }
     buf[offset] = '\n';
     buf[offset+1] = 0;
 

     avio_write(s->pb, buf, strlen(buf));

     avio_flush(s->pb);

 }
 

 #define OFFSET(x) offsetof(struct MD5Context, x)
 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption hash_options[] = {
     { "hash", "set hash to use", OFFSET(hash_name), AV_OPT_TYPE_STRING, {.str = "md5"}, 0, 0, ENC },
     { NULL },
 };
 

 static const AVClass md5enc_class = {

     .class_name = "hash encoder class",
     .item_name  = av_default_item_name,
     .option     = hash_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 

 #if CONFIG_MD5_MUXER

 static int write_header(struct AVFormatContext *s)
 {

     struct MD5Context *c = s->priv_data;

     int res = av_hash_alloc(&c->hash, c->hash_name);
     if (res < 0)
         return res;
     av_hash_init(c->hash);

     return 0;
 }
 
 static int write_packet(struct AVFormatContext *s, AVPacket *pkt)
 {

     struct MD5Context *c = s->priv_data;

     av_hash_update(c->hash, pkt->data, pkt->size);

     return 0;
 }
 
 static int write_trailer(struct AVFormatContext *s)
 {

     struct MD5Context *c = s->priv_data;

     char buf[256];
     av_strlcpy(buf, av_hash_get_name(c->hash), sizeof(buf) - 200);
     av_strlcat(buf, "=", sizeof(buf) - 200);

     md5_finish(s, buf);

     av_hash_freep(&c->hash);

     return 0;
 }
 

 AVOutputFormat ff_md5_muxer = {

     .name              = "md5",

     .long_name         = NULL_IF_CONFIG_SMALL("MD5 testing"),

     .priv_data_size    = sizeof(struct MD5Context),

     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_RAWVIDEO,

     .write_header      = write_header,
     .write_packet      = write_packet,
     .write_trailer     = write_trailer,

     .flags             = AVFMT_NOTIMESTAMPS,

     .priv_class        = &md5enc_class,

 };

 #endif
 
 #if CONFIG_FRAMEMD5_MUXER

 static int framemd5_write_header(struct AVFormatContext *s)
 {
     struct MD5Context *c = s->priv_data;

     int res = av_hash_alloc(&c->hash, c->hash_name);
     if (res < 0)
         return res;

     avio_printf(s->pb, "#format: frame checksums\n");
     avio_printf(s->pb, "#version: 1\n");
     avio_printf(s->pb, "#hash: %s\n", av_hash_get_name(c->hash));
     ff_framehash_write_header(s);
     avio_printf(s->pb, "#stream#, dts,        pts, duration,     size, hash\n");
     return 0;

 }
 

 static int framemd5_write_packet(struct AVFormatContext *s, AVPacket *pkt)
 {

     struct MD5Context *c = s->priv_data;

     char buf[256];

     av_hash_init(c->hash);
     av_hash_update(c->hash, pkt->data, pkt->size);

     snprintf(buf, sizeof(buf) - 64, "%d, %10"PRId64", %10"PRId64", %8d, %8d, ",
              pkt->stream_index, pkt->dts, pkt->pts, pkt->duration, pkt->size);

     md5_finish(s, buf);
     return 0;
 }
 

 static int framemd5_write_trailer(struct AVFormatContext *s)
 {
     struct MD5Context *c = s->priv_data;

     av_hash_freep(&c->hash);

     return 0;
 }
 

 static const AVClass framemd5_class = {

     .class_name = "frame hash encoder class",

     .item_name  = av_default_item_name,
     .option     = hash_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 

 AVOutputFormat ff_framemd5_muxer = {

     .name              = "framemd5",

     .long_name         = NULL_IF_CONFIG_SMALL("Per-frame MD5 testing"),

     .priv_data_size    = sizeof(struct MD5Context),

     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_RAWVIDEO,

     .write_header      = framemd5_write_header,

     .write_packet      = framemd5_write_packet,

     .write_trailer     = framemd5_write_trailer,

     .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
                          AVFMT_TS_NEGATIVE,

     .priv_class        = &framemd5_class,

 };
 #endif