libavformat/hashenc.c - manifest_repos/ffmpeg - Git at Google

 /*
  * Hash/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/intreadwrite.h"
 #include "libavutil/opt.h"
 #include "avformat.h"
 #include "internal.h"

 struct HashContext {
     const AVClass *avclass;
     struct AVHashContext **hashes;
     char *hash_name;
     int per_stream;
     int format_version;
 };

 #define OFFSET(x) offsetof(struct HashContext, x)
 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 #define HASH_OPT(defaulttype) \
     { "hash", "set hash to use", OFFSET(hash_name), AV_OPT_TYPE_STRING, {.str = defaulttype}, 0, 0, ENC }
 #define FORMAT_VERSION_OPT \
     { "format_version", "file format version", OFFSET(format_version), AV_OPT_TYPE_INT, {.i64 = 2}, 1, 2, ENC }

 #if CONFIG_HASH_MUXER
 static const AVOption hash_options[] = {
     HASH_OPT("sha256"),
     { NULL },
 };
 #endif

 #if CONFIG_FRAMEHASH_MUXER
 static const AVOption framehash_options[] = {
     HASH_OPT("sha256"),
     FORMAT_VERSION_OPT,
     { NULL },
 };
 #endif

 #if CONFIG_STREAMHASH_MUXER
 static const AVOption streamhash_options[] = {
     HASH_OPT("sha256"),
     { NULL },
 };
 #endif

 #if CONFIG_MD5_MUXER
 static const AVOption md5_options[] = {
     HASH_OPT("md5"),
     { NULL },
 };
 #endif

 #if CONFIG_FRAMEMD5_MUXER
 static const AVOption framemd5_options[] = {
     HASH_OPT("md5"),
     FORMAT_VERSION_OPT,
     { NULL },
 };
 #endif

 #if CONFIG_HASH_MUXER || CONFIG_MD5_MUXER
 static int hash_init(struct AVFormatContext *s)
 {
     int res;
     struct HashContext *c = s->priv_data;
     c->per_stream = 0;
     c->hashes = av_mallocz_array(1, sizeof(*c->hashes));
     if (!c->hashes)
         return AVERROR(ENOMEM);
     res = av_hash_alloc(&c->hashes[0], c->hash_name);
     if (res < 0)
         return res;
     av_hash_init(c->hashes[0]);
     return 0;
 }
 #endif

 #if CONFIG_STREAMHASH_MUXER
 static int streamhash_init(struct AVFormatContext *s)
 {
     int res, i;
     struct HashContext *c = s->priv_data;
     c->per_stream = 1;
     c->hashes = av_mallocz_array(s->nb_streams, sizeof(*c->hashes));
     if (!c->hashes)
         return AVERROR(ENOMEM);
     for (i = 0; i < s->nb_streams; i++) {
         res = av_hash_alloc(&c->hashes[i], c->hash_name);
         if (res < 0) {
             return res;
         }
         av_hash_init(c->hashes[i]);
     }
     return 0;
 }
 #endif

 #if CONFIG_HASH_MUXER || CONFIG_MD5_MUXER || CONFIG_STREAMHASH_MUXER
 static char get_media_type_char(enum AVMediaType type)
 {
     switch (type) {
     case AVMEDIA_TYPE_VIDEO:      return 'v';
     case AVMEDIA_TYPE_AUDIO:      return 'a';
     case AVMEDIA_TYPE_DATA:       return 'd';
     case AVMEDIA_TYPE_SUBTITLE:   return 's';
     case AVMEDIA_TYPE_ATTACHMENT: return 't';
     default:                      return '?';
     }
 }

 static int hash_write_packet(struct AVFormatContext *s, AVPacket *pkt)
 {
     struct HashContext *c = s->priv_data;
     av_hash_update(c->hashes[c->per_stream ? pkt->stream_index : 0], pkt->data, pkt->size);
     return 0;
 }

 static int hash_write_trailer(struct AVFormatContext *s)
 {
     struct HashContext *c = s->priv_data;
     int num_hashes = c->per_stream ? s->nb_streams : 1;
     for (int i = 0; i < num_hashes; i++) {
         char buf[AV_HASH_MAX_SIZE*2+128];
         if (c->per_stream) {
             AVStream *st = s->streams[i];
             snprintf(buf, sizeof(buf) - 200, "%d,%c,%s=", i, get_media_type_char(st->codecpar->codec_type),
                      av_hash_get_name(c->hashes[i]));
         } else {
             snprintf(buf, sizeof(buf) - 200, "%s=", av_hash_get_name(c->hashes[i]));
         }
         av_hash_final_hex(c->hashes[i], buf + strlen(buf), sizeof(buf) - strlen(buf));
         av_strlcatf(buf, sizeof(buf), "\n");
         avio_write(s->pb, buf, strlen(buf));
     }

     return 0;
 }
 #endif

 static void hash_free(struct AVFormatContext *s)
 {
     struct HashContext *c = s->priv_data;
     if (c->hashes) {
         int num_hashes = c->per_stream ? s->nb_streams : 1;
         for (int i = 0; i < num_hashes; i++) {
             av_hash_freep(&c->hashes[i]);
         }
     }
     av_freep(&c->hashes);
 }

 #if CONFIG_HASH_MUXER
 static const AVClass hashenc_class = {
     .class_name = "hash muxer",
     .item_name  = av_default_item_name,
     .option     = hash_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 AVOutputFormat ff_hash_muxer = {
     .name              = "hash",
     .long_name         = NULL_IF_CONFIG_SMALL("Hash testing"),
     .priv_data_size    = sizeof(struct HashContext),
     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_RAWVIDEO,
     .init              = hash_init,
     .write_packet      = hash_write_packet,
     .write_trailer     = hash_write_trailer,
     .deinit            = hash_free,
     .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
                          AVFMT_TS_NEGATIVE,
     .priv_class        = &hashenc_class,
 };
 #endif

 #if CONFIG_MD5_MUXER
 static const AVClass md5enc_class = {
     .class_name = "MD5 muxer",
     .item_name  = av_default_item_name,
     .option     = md5_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 AVOutputFormat ff_md5_muxer = {
     .name              = "md5",
     .long_name         = NULL_IF_CONFIG_SMALL("MD5 testing"),
     .priv_data_size    = sizeof(struct HashContext),
     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_RAWVIDEO,
     .init              = hash_init,
     .write_packet      = hash_write_packet,
     .write_trailer     = hash_write_trailer,
     .deinit            = hash_free,
     .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
                          AVFMT_TS_NEGATIVE,
     .priv_class        = &md5enc_class,
 };
 #endif

 #if CONFIG_STREAMHASH_MUXER
 static const AVClass streamhashenc_class = {
     .class_name = "stream hash muxer",
     .item_name  = av_default_item_name,
     .option     = streamhash_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 AVOutputFormat ff_streamhash_muxer = {
     .name              = "streamhash",
     .long_name         = NULL_IF_CONFIG_SMALL("Per-stream hash testing"),
     .priv_data_size    = sizeof(struct HashContext),
     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_RAWVIDEO,
     .init              = streamhash_init,
     .write_packet      = hash_write_packet,
     .write_trailer     = hash_write_trailer,
     .deinit            = hash_free,
     .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
                          AVFMT_TS_NEGATIVE,
     .priv_class        = &streamhashenc_class,
 };
 #endif

 #if CONFIG_FRAMEHASH_MUXER || CONFIG_FRAMEMD5_MUXER
 static void framehash_print_extradata(struct AVFormatContext *s)
 {
     int i;

     for (i = 0; i < s->nb_streams; i++) {
         AVStream *st = s->streams[i];
         AVCodecParameters *par = st->codecpar;
         if (par->extradata) {
             struct HashContext *c = s->priv_data;
             char buf[AV_HASH_MAX_SIZE*2+1];

             avio_printf(s->pb, "#extradata %d, %31d, ", i, par->extradata_size);
             av_hash_init(c->hashes[0]);
             av_hash_update(c->hashes[0], par->extradata, par->extradata_size);
             av_hash_final_hex(c->hashes[0], buf, sizeof(buf));
             avio_write(s->pb, buf, strlen(buf));
             avio_printf(s->pb, "\n");
         }
     }
 }

 static int framehash_init(struct AVFormatContext *s)
 {
     int res;
     struct HashContext *c = s->priv_data;
     c->per_stream = 0;
     c->hashes = av_mallocz_array(1, sizeof(*c->hashes));
     if (!c->hashes)
         return AVERROR(ENOMEM);
     res = av_hash_alloc(&c->hashes[0], c->hash_name);
     if (res < 0)
         return res;
     return 0;
 }

 static int framehash_write_header(struct AVFormatContext *s)
 {
     struct HashContext *c = s->priv_data;
     avio_printf(s->pb, "#format: frame checksums\n");
     avio_printf(s->pb, "#version: %d\n", c->format_version);
     avio_printf(s->pb, "#hash: %s\n", av_hash_get_name(c->hashes[0]));
     framehash_print_extradata(s);
     ff_framehash_write_header(s);
     avio_printf(s->pb, "#stream#, dts,        pts, duration,     size, hash\n");
     return 0;
 }

 static int framehash_write_packet(struct AVFormatContext *s, AVPacket *pkt)
 {
     struct HashContext *c = s->priv_data;
     char buf[AV_HASH_MAX_SIZE*2+128];
     int len;
     av_hash_init(c->hashes[0]);
     av_hash_update(c->hashes[0], pkt->data, pkt->size);

     snprintf(buf, sizeof(buf) - (AV_HASH_MAX_SIZE * 2 + 1), "%d, %10"PRId64", %10"PRId64", %8"PRId64", %8d, ",
              pkt->stream_index, pkt->dts, pkt->pts, pkt->duration, pkt->size);
     len = strlen(buf);
     av_hash_final_hex(c->hashes[0], buf + len, sizeof(buf) - len);
     avio_write(s->pb, buf, strlen(buf));

     if (c->format_version > 1 && pkt->side_data_elems) {
         int i, j;
         avio_printf(s->pb, ", S=%d", pkt->side_data_elems);
         for (i = 0; i < pkt->side_data_elems; i++) {
             av_hash_init(c->hashes[0]);
             if (HAVE_BIGENDIAN && pkt->side_data[i].type == AV_PKT_DATA_PALETTE) {
                 for (j = 0; j < pkt->side_data[i].size; j += sizeof(uint32_t)) {
                     uint32_t data = AV_RL32(pkt->side_data[i].data + j);
                     av_hash_update(c->hashes[0], (uint8_t *)&data, sizeof(uint32_t));
                 }
             } else
                 av_hash_update(c->hashes[0], pkt->side_data[i].data, pkt->side_data[i].size);
             snprintf(buf, sizeof(buf) - (AV_HASH_MAX_SIZE * 2 + 1), ", %8d, ", pkt->side_data[i].size);
             len = strlen(buf);
             av_hash_final_hex(c->hashes[0], buf + len, sizeof(buf) - len);
             avio_write(s->pb, buf, strlen(buf));
         }
     }

     avio_printf(s->pb, "\n");
     return 0;
 }
 #endif

 #if CONFIG_FRAMEHASH_MUXER
 static const AVClass framehash_class = {
     .class_name = "frame hash muxer",
     .item_name  = av_default_item_name,
     .option     = framehash_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 AVOutputFormat ff_framehash_muxer = {
     .name              = "framehash",
     .long_name         = NULL_IF_CONFIG_SMALL("Per-frame hash testing"),
     .priv_data_size    = sizeof(struct HashContext),
     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_RAWVIDEO,
     .init              = framehash_init,
     .write_header      = framehash_write_header,
     .write_packet      = framehash_write_packet,
     .deinit            = hash_free,
     .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
                          AVFMT_TS_NEGATIVE,
     .priv_class        = &framehash_class,
 };
 #endif

 #if CONFIG_FRAMEMD5_MUXER
 static const AVClass framemd5_class = {
     .class_name = "frame MD5 muxer",
     .item_name  = av_default_item_name,
     .option     = framemd5_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 HashContext),
     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_RAWVIDEO,
     .init              = framehash_init,
     .write_header      = framehash_write_header,
     .write_packet      = framehash_write_packet,
     .deinit            = hash_free,
     .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
                          AVFMT_TS_NEGATIVE,
     .priv_class        = &framemd5_class,
 };
 #endif
	/*
	* Hash/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/intreadwrite.h"
	#include "libavutil/opt.h"
	#include "avformat.h"
	#include "internal.h"

	struct HashContext {
	const AVClass *avclass;
	struct AVHashContext **hashes;
	char *hash_name;
	int per_stream;
	int format_version;
	};

	#define OFFSET(x) offsetof(struct HashContext, x)
	#define ENC AV_OPT_FLAG_ENCODING_PARAM
	#define HASH_OPT(defaulttype) \
	{ "hash", "set hash to use", OFFSET(hash_name), AV_OPT_TYPE_STRING, {.str = defaulttype}, 0, 0, ENC }
	#define FORMAT_VERSION_OPT \
	{ "format_version", "file format version", OFFSET(format_version), AV_OPT_TYPE_INT, {.i64 = 2}, 1, 2, ENC }

	#if CONFIG_HASH_MUXER
	static const AVOption hash_options[] = {
	HASH_OPT("sha256"),
	{ NULL },
	};
	#endif

	#if CONFIG_FRAMEHASH_MUXER
	static const AVOption framehash_options[] = {
	HASH_OPT("sha256"),
	FORMAT_VERSION_OPT,
	{ NULL },
	};
	#endif

	#if CONFIG_STREAMHASH_MUXER
	static const AVOption streamhash_options[] = {
	HASH_OPT("sha256"),
	{ NULL },
	};
	#endif

	#if CONFIG_MD5_MUXER
	static const AVOption md5_options[] = {
	HASH_OPT("md5"),
	{ NULL },
	};
	#endif

	#if CONFIG_FRAMEMD5_MUXER
	static const AVOption framemd5_options[] = {
	HASH_OPT("md5"),
	FORMAT_VERSION_OPT,
	{ NULL },
	};
	#endif

	#if CONFIG_HASH_MUXER \|\| CONFIG_MD5_MUXER
	static int hash_init(struct AVFormatContext *s)
	{
	int res;
	struct HashContext *c = s->priv_data;
	c->per_stream = 0;
	c->hashes = av_mallocz_array(1, sizeof(*c->hashes));
	if (!c->hashes)
	return AVERROR(ENOMEM);
	res = av_hash_alloc(&c->hashes[0], c->hash_name);
	if (res < 0)
	return res;
	av_hash_init(c->hashes[0]);
	return 0;
	}
	#endif

	#if CONFIG_STREAMHASH_MUXER
	static int streamhash_init(struct AVFormatContext *s)
	{
	int res, i;
	struct HashContext *c = s->priv_data;
	c->per_stream = 1;
	c->hashes = av_mallocz_array(s->nb_streams, sizeof(*c->hashes));
	if (!c->hashes)
	return AVERROR(ENOMEM);
	for (i = 0; i < s->nb_streams; i++) {
	res = av_hash_alloc(&c->hashes[i], c->hash_name);
	if (res < 0) {
	return res;
	}
	av_hash_init(c->hashes[i]);
	}
	return 0;
	}
	#endif

	#if CONFIG_HASH_MUXER \|\| CONFIG_MD5_MUXER \|\| CONFIG_STREAMHASH_MUXER
	static char get_media_type_char(enum AVMediaType type)
	{
	switch (type) {
	case AVMEDIA_TYPE_VIDEO: return 'v';
	case AVMEDIA_TYPE_AUDIO: return 'a';
	case AVMEDIA_TYPE_DATA: return 'd';
	case AVMEDIA_TYPE_SUBTITLE: return 's';
	case AVMEDIA_TYPE_ATTACHMENT: return 't';
	default: return '?';
	}
	}

	static int hash_write_packet(struct AVFormatContext s, AVPacket pkt)
	{
	struct HashContext *c = s->priv_data;
	av_hash_update(c->hashes[c->per_stream ? pkt->stream_index : 0], pkt->data, pkt->size);
	return 0;
	}

	static int hash_write_trailer(struct AVFormatContext *s)
	{
	struct HashContext *c = s->priv_data;
	int num_hashes = c->per_stream ? s->nb_streams : 1;
	for (int i = 0; i < num_hashes; i++) {
	char buf[AV_HASH_MAX_SIZE*2+128];
	if (c->per_stream) {
	AVStream *st = s->streams[i];
	snprintf(buf, sizeof(buf) - 200, "%d,%c,%s=", i, get_media_type_char(st->codecpar->codec_type),
	av_hash_get_name(c->hashes[i]));
	} else {
	snprintf(buf, sizeof(buf) - 200, "%s=", av_hash_get_name(c->hashes[i]));
	}
	av_hash_final_hex(c->hashes[i], buf + strlen(buf), sizeof(buf) - strlen(buf));
	av_strlcatf(buf, sizeof(buf), "\n");
	avio_write(s->pb, buf, strlen(buf));
	}

	return 0;
	}
	#endif

	static void hash_free(struct AVFormatContext *s)
	{
	struct HashContext *c = s->priv_data;
	if (c->hashes) {
	int num_hashes = c->per_stream ? s->nb_streams : 1;
	for (int i = 0; i < num_hashes; i++) {
	av_hash_freep(&c->hashes[i]);
	}
	}
	av_freep(&c->hashes);
	}

	#if CONFIG_HASH_MUXER
	static const AVClass hashenc_class = {
	.class_name = "hash muxer",
	.item_name = av_default_item_name,
	.option = hash_options,
	.version = LIBAVUTIL_VERSION_INT,
	};

	AVOutputFormat ff_hash_muxer = {
	.name = "hash",
	.long_name = NULL_IF_CONFIG_SMALL("Hash testing"),
	.priv_data_size = sizeof(struct HashContext),
	.audio_codec = AV_CODEC_ID_PCM_S16LE,
	.video_codec = AV_CODEC_ID_RAWVIDEO,
	.init = hash_init,
	.write_packet = hash_write_packet,
	.write_trailer = hash_write_trailer,
	.deinit = hash_free,
	.flags = AVFMT_VARIABLE_FPS \| AVFMT_TS_NONSTRICT \|
	AVFMT_TS_NEGATIVE,
	.priv_class = &hashenc_class,
	};
	#endif

	#if CONFIG_MD5_MUXER
	static const AVClass md5enc_class = {
	.class_name = "MD5 muxer",
	.item_name = av_default_item_name,
	.option = md5_options,
	.version = LIBAVUTIL_VERSION_INT,
	};

	AVOutputFormat ff_md5_muxer = {
	.name = "md5",
	.long_name = NULL_IF_CONFIG_SMALL("MD5 testing"),
	.priv_data_size = sizeof(struct HashContext),
	.audio_codec = AV_CODEC_ID_PCM_S16LE,
	.video_codec = AV_CODEC_ID_RAWVIDEO,
	.init = hash_init,
	.write_packet = hash_write_packet,
	.write_trailer = hash_write_trailer,
	.deinit = hash_free,
	.flags = AVFMT_VARIABLE_FPS \| AVFMT_TS_NONSTRICT \|
	AVFMT_TS_NEGATIVE,
	.priv_class = &md5enc_class,
	};
	#endif

	#if CONFIG_STREAMHASH_MUXER
	static const AVClass streamhashenc_class = {
	.class_name = "stream hash muxer",
	.item_name = av_default_item_name,
	.option = streamhash_options,
	.version = LIBAVUTIL_VERSION_INT,
	};

	AVOutputFormat ff_streamhash_muxer = {
	.name = "streamhash",
	.long_name = NULL_IF_CONFIG_SMALL("Per-stream hash testing"),
	.priv_data_size = sizeof(struct HashContext),
	.audio_codec = AV_CODEC_ID_PCM_S16LE,
	.video_codec = AV_CODEC_ID_RAWVIDEO,
	.init = streamhash_init,
	.write_packet = hash_write_packet,
	.write_trailer = hash_write_trailer,
	.deinit = hash_free,
	.flags = AVFMT_VARIABLE_FPS \| AVFMT_TS_NONSTRICT \|
	AVFMT_TS_NEGATIVE,
	.priv_class = &streamhashenc_class,
	};
	#endif

	#if CONFIG_FRAMEHASH_MUXER \|\| CONFIG_FRAMEMD5_MUXER
	static void framehash_print_extradata(struct AVFormatContext *s)
	{
	int i;

	for (i = 0; i < s->nb_streams; i++) {
	AVStream *st = s->streams[i];
	AVCodecParameters *par = st->codecpar;
	if (par->extradata) {
	struct HashContext *c = s->priv_data;
	char buf[AV_HASH_MAX_SIZE*2+1];

	avio_printf(s->pb, "#extradata %d, %31d, ", i, par->extradata_size);
	av_hash_init(c->hashes[0]);
	av_hash_update(c->hashes[0], par->extradata, par->extradata_size);
	av_hash_final_hex(c->hashes[0], buf, sizeof(buf));
	avio_write(s->pb, buf, strlen(buf));
	avio_printf(s->pb, "\n");
	}
	}
	}

	static int framehash_init(struct AVFormatContext *s)
	{
	int res;
	struct HashContext *c = s->priv_data;
	c->per_stream = 0;
	c->hashes = av_mallocz_array(1, sizeof(*c->hashes));
	if (!c->hashes)
	return AVERROR(ENOMEM);
	res = av_hash_alloc(&c->hashes[0], c->hash_name);
	if (res < 0)
	return res;
	return 0;
	}

	static int framehash_write_header(struct AVFormatContext *s)
	{
	struct HashContext *c = s->priv_data;
	avio_printf(s->pb, "#format: frame checksums\n");
	avio_printf(s->pb, "#version: %d\n", c->format_version);
	avio_printf(s->pb, "#hash: %s\n", av_hash_get_name(c->hashes[0]));
	framehash_print_extradata(s);
	ff_framehash_write_header(s);
	avio_printf(s->pb, "#stream#, dts, pts, duration, size, hash\n");
	return 0;
	}

	static int framehash_write_packet(struct AVFormatContext s, AVPacket pkt)
	{
	struct HashContext *c = s->priv_data;
	char buf[AV_HASH_MAX_SIZE*2+128];
	int len;
	av_hash_init(c->hashes[0]);
	av_hash_update(c->hashes[0], pkt->data, pkt->size);

	snprintf(buf, sizeof(buf) - (AV_HASH_MAX_SIZE * 2 + 1), "%d, %10"PRId64", %10"PRId64", %8"PRId64", %8d, ",
	pkt->stream_index, pkt->dts, pkt->pts, pkt->duration, pkt->size);
	len = strlen(buf);
	av_hash_final_hex(c->hashes[0], buf + len, sizeof(buf) - len);
	avio_write(s->pb, buf, strlen(buf));

	if (c->format_version > 1 && pkt->side_data_elems) {
	int i, j;
	avio_printf(s->pb, ", S=%d", pkt->side_data_elems);
	for (i = 0; i < pkt->side_data_elems; i++) {
	av_hash_init(c->hashes[0]);
	if (HAVE_BIGENDIAN && pkt->side_data[i].type == AV_PKT_DATA_PALETTE) {
	for (j = 0; j < pkt->side_data[i].size; j += sizeof(uint32_t)) {
	uint32_t data = AV_RL32(pkt->side_data[i].data + j);
	av_hash_update(c->hashes[0], (uint8_t *)&data, sizeof(uint32_t));
	}
	} else
	av_hash_update(c->hashes[0], pkt->side_data[i].data, pkt->side_data[i].size);
	snprintf(buf, sizeof(buf) - (AV_HASH_MAX_SIZE * 2 + 1), ", %8d, ", pkt->side_data[i].size);
	len = strlen(buf);
	av_hash_final_hex(c->hashes[0], buf + len, sizeof(buf) - len);
	avio_write(s->pb, buf, strlen(buf));
	}
	}

	avio_printf(s->pb, "\n");
	return 0;
	}
	#endif

	#if CONFIG_FRAMEHASH_MUXER
	static const AVClass framehash_class = {
	.class_name = "frame hash muxer",
	.item_name = av_default_item_name,
	.option = framehash_options,
	.version = LIBAVUTIL_VERSION_INT,
	};

	AVOutputFormat ff_framehash_muxer = {
	.name = "framehash",
	.long_name = NULL_IF_CONFIG_SMALL("Per-frame hash testing"),
	.priv_data_size = sizeof(struct HashContext),
	.audio_codec = AV_CODEC_ID_PCM_S16LE,
	.video_codec = AV_CODEC_ID_RAWVIDEO,
	.init = framehash_init,
	.write_header = framehash_write_header,
	.write_packet = framehash_write_packet,
	.deinit = hash_free,
	.flags = AVFMT_VARIABLE_FPS \| AVFMT_TS_NONSTRICT \|
	AVFMT_TS_NEGATIVE,
	.priv_class = &framehash_class,
	};
	#endif

	#if CONFIG_FRAMEMD5_MUXER
	static const AVClass framemd5_class = {
	.class_name = "frame MD5 muxer",
	.item_name = av_default_item_name,
	.option = framemd5_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 HashContext),
	.audio_codec = AV_CODEC_ID_PCM_S16LE,
	.video_codec = AV_CODEC_ID_RAWVIDEO,
	.init = framehash_init,
	.write_header = framehash_write_header,
	.write_packet = framehash_write_packet,
	.deinit = hash_free,
	.flags = AVFMT_VARIABLE_FPS \| AVFMT_TS_NONSTRICT \|
	AVFMT_TS_NEGATIVE,
	.priv_class = &framemd5_class,
	};
	#endif