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

 /*
  * AU muxer and demuxer
  * Copyright (c) 2001 Fabrice Bellard
  *
  * first version by Francois Revol <revol@free.fr>
  *
  * 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
  */

 /*
  * Reference documents:
  * http://www.opengroup.org/public/pubs/external/auformat.html
  * http://www.goice.co.jp/member/mo/formats/au.html
  */

 #include "avformat.h"
 #include "internal.h"
 #include "avio_internal.h"
 #include "pcm.h"
 #include "libavutil/avassert.h"

 /* if we don't know the size in advance */
 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))

 static const AVCodecTag codec_au_tags[] = {
     { AV_CODEC_ID_PCM_MULAW,  1 },
     { AV_CODEC_ID_PCM_S8,     2 },
     { AV_CODEC_ID_PCM_S16BE,  3 },
     { AV_CODEC_ID_PCM_S24BE,  4 },
     { AV_CODEC_ID_PCM_S32BE,  5 },
     { AV_CODEC_ID_PCM_F32BE,  6 },
     { AV_CODEC_ID_PCM_F64BE,  7 },
     { AV_CODEC_ID_ADPCM_G726LE, 23 },
     { AV_CODEC_ID_ADPCM_G722,24 },
     { AV_CODEC_ID_ADPCM_G726LE, 25 },
     { AV_CODEC_ID_ADPCM_G726LE, 26 },
     { AV_CODEC_ID_PCM_ALAW,  27 },
     { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
     { AV_CODEC_ID_NONE,       0 },
 };

 #if CONFIG_AU_DEMUXER

 static int au_probe(const AVProbeData *p)
 {
     if (p->buf[0] == '.' && p->buf[1] == 's' &&
         p->buf[2] == 'n' && p->buf[3] == 'd')
         return AVPROBE_SCORE_MAX;
     else
         return 0;
 }

 static int au_read_annotation(AVFormatContext *s, int size)
 {
     static const char keys[][7] = {
         "title",
         "artist",
         "album",
         "track",
         "genre",
     };
     AVIOContext *pb = s->pb;
     enum { PARSE_KEY, PARSE_VALUE, PARSE_FINISHED } state = PARSE_KEY;
     char c;
     AVBPrint bprint;
     char * key = NULL;
     char * value = NULL;
     int ret, i;

     av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);

     while (size-- > 0) {
         if (avio_feof(pb)) {
             av_bprint_finalize(&bprint, NULL);
             av_freep(&key);
             return AVERROR_EOF;
         }
         c = avio_r8(pb);
         switch(state) {
         case PARSE_KEY:
             if (c == '\0') {
                 state = PARSE_FINISHED;
             } else if (c == '=') {
                 ret = av_bprint_finalize(&bprint, &key);
                 if (ret < 0)
                     return ret;
                 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
                 state = PARSE_VALUE;
             } else {
                 av_bprint_chars(&bprint, c, 1);
             }
             break;
         case PARSE_VALUE:
             if (c == '\0' || c == '\n') {
                 if (av_bprint_finalize(&bprint, &value) != 0) {
                     av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
                 } else {
                     av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
                     for (i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
                         if (av_strcasecmp(keys[i], key) == 0) {
                             av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
                             value = NULL;
                             break;
                         }
                     }
                 }
                 av_freep(&key);
                 av_freep(&value);
                 state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
             } else {
                 av_bprint_chars(&bprint, c, 1);
             }
             break;
         case PARSE_FINISHED:
             break;
         default:
             /* should never happen */
             av_assert0(0);
         }
     }
     av_bprint_finalize(&bprint, NULL);
     av_freep(&key);
     return 0;
 }

 #define BLOCK_SIZE 1024

 static int au_read_header(AVFormatContext *s)
 {
     int size, data_size = 0;
     unsigned int tag;
     AVIOContext *pb = s->pb;
     unsigned int id, channels, rate;
     int bps, ba = 0;
     enum AVCodecID codec;
     AVStream *st;
     int ret;

     tag = avio_rl32(pb);
     if (tag != MKTAG('.', 's', 'n', 'd'))
         return AVERROR_INVALIDDATA;
     size = avio_rb32(pb); /* header size */
     data_size = avio_rb32(pb); /* data size in bytes */

     if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
         av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
         return AVERROR_INVALIDDATA;
     }

     id       = avio_rb32(pb);
     rate     = avio_rb32(pb);
     channels = avio_rb32(pb);

     if (size > 24) {
         /* parse annotation field to get metadata */
         ret = au_read_annotation(s, size - 24);
         if (ret < 0)
             return ret;
     }

     codec = ff_codec_get_id(codec_au_tags, id);

     if (codec == AV_CODEC_ID_NONE) {
         avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
         return AVERROR_PATCHWELCOME;
     }

     bps = av_get_bits_per_sample(codec);
     if (codec == AV_CODEC_ID_ADPCM_G726LE) {
         if (id == MKBETAG('7','2','6','2')) {
             bps = 2;
         } else {
             const uint8_t bpcss[] = {4, 0, 3, 5};
             av_assert0(id >= 23 && id < 23 + 4);
             ba = bpcss[id - 23];
             bps = bpcss[id - 23];
         }
     } else if (!bps) {
         avpriv_request_sample(s, "Unknown bits per sample");
         return AVERROR_PATCHWELCOME;
     }

     if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
         av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
         return AVERROR_INVALIDDATA;
     }

     if (rate == 0 || rate > INT_MAX) {
         av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
         return AVERROR_INVALIDDATA;
     }

     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
     st->codecpar->codec_tag   = id;
     st->codecpar->codec_id    = codec;
     st->codecpar->channels    = channels;
     st->codecpar->sample_rate = rate;
     st->codecpar->bits_per_coded_sample = bps;
     st->codecpar->bit_rate    = channels * rate * bps;
     st->codecpar->block_align = ba ? ba : FFMAX(bps * st->codecpar->channels / 8, 1);
     if (data_size != AU_UNKNOWN_SIZE)
         st->duration = (((int64_t)data_size)<<3) / (st->codecpar->channels * (int64_t)bps);

     st->start_time = 0;
     avpriv_set_pts_info(st, 64, 1, rate);

     return 0;
 }

 AVInputFormat ff_au_demuxer = {
     .name        = "au",
     .long_name   = NULL_IF_CONFIG_SMALL("Sun AU"),
     .read_probe  = au_probe,
     .read_header = au_read_header,
     .read_packet = ff_pcm_read_packet,
     .read_seek   = ff_pcm_read_seek,
     .codec_tag   = (const AVCodecTag* const []) { codec_au_tags, 0 },
 };

 #endif /* CONFIG_AU_DEMUXER */

 #if CONFIG_AU_MUXER

 typedef struct AUContext {
     uint32_t header_size;
 } AUContext;

 #include "rawenc.h"

 static int au_get_annotations(AVFormatContext *s, AVBPrint *annotations)
 {
     static const char keys[][7] = {
         "Title",
         "Artist",
         "Album",
         "Track",
         "Genre",
     };
     int cnt = 0;
     AVDictionary *m = s->metadata;
     AVDictionaryEntry *t = NULL;

     for (int i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
         t = av_dict_get(m, keys[i], NULL, 0);
         if (t != NULL) {
             if (cnt++)
                 av_bprint_chars(annotations, '\n', 1);
             av_bprintf(annotations, "%s=%s", keys[i], t->value);
         }
     }
     /* The specification requires the annotation field to be zero-terminated
      * and its length to be a multiple of eight, so pad with 0's */
     av_bprint_chars(annotations, '\0', 8);
     return av_bprint_is_complete(annotations) ? 0 : AVERROR(ENOMEM);
 }

 static int au_write_header(AVFormatContext *s)
 {
     int ret;
     AUContext *au = s->priv_data;
     AVIOContext *pb = s->pb;
     AVCodecParameters *par = s->streams[0]->codecpar;
     AVBPrint annotations;

     if (s->nb_streams != 1) {
         av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
         return AVERROR(EINVAL);
     }

     par->codec_tag = ff_codec_get_tag(codec_au_tags, par->codec_id);
     if (!par->codec_tag) {
         av_log(s, AV_LOG_ERROR, "unsupported codec\n");
         return AVERROR(EINVAL);
     }

     av_bprint_init(&annotations, 0, INT_MAX - 24);
     ret = au_get_annotations(s, &annotations);
     if (ret < 0)
         goto fail;
     au->header_size = 24 + annotations.len & ~7;

     ffio_wfourcc(pb, ".snd");                   /* magic number */
     avio_wb32(pb, au->header_size);             /* header size */
     avio_wb32(pb, AU_UNKNOWN_SIZE);             /* data size */
     avio_wb32(pb, par->codec_tag);              /* codec ID */
     avio_wb32(pb, par->sample_rate);
     avio_wb32(pb, par->channels);
     avio_write(pb, annotations.str, annotations.len & ~7);

 fail:
     av_bprint_finalize(&annotations, NULL);

     return ret;
 }

 static int au_write_trailer(AVFormatContext *s)
 {
     AVIOContext *pb = s->pb;
     AUContext *au = s->priv_data;
     int64_t file_size = avio_tell(pb);

     if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && file_size < INT32_MAX) {
         /* update file size */
         avio_seek(pb, 8, SEEK_SET);
         avio_wb32(pb, (uint32_t)(file_size - au->header_size));
         avio_seek(pb, file_size, SEEK_SET);
     }

     return 0;
 }

 AVOutputFormat ff_au_muxer = {
     .name          = "au",
     .long_name     = NULL_IF_CONFIG_SMALL("Sun AU"),
     .mime_type     = "audio/basic",
     .extensions    = "au",
     .priv_data_size = sizeof(AUContext),
     .audio_codec   = AV_CODEC_ID_PCM_S16BE,
     .video_codec   = AV_CODEC_ID_NONE,
     .write_header  = au_write_header,
     .write_packet  = ff_raw_write_packet,
     .write_trailer = au_write_trailer,
     .codec_tag     = (const AVCodecTag* const []) { codec_au_tags, 0 },
     .flags         = AVFMT_NOTIMESTAMPS,
 };

 #endif /* CONFIG_AU_MUXER */
	/*
	* AU muxer and demuxer
	* Copyright (c) 2001 Fabrice Bellard
	*
	* first version by Francois Revol <revol@free.fr>
	*
	* 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
	*/

	/*
	* Reference documents:
	* http://www.opengroup.org/public/pubs/external/auformat.html
	* http://www.goice.co.jp/member/mo/formats/au.html
	*/

	#include "avformat.h"
	#include "internal.h"
	#include "avio_internal.h"
	#include "pcm.h"
	#include "libavutil/avassert.h"

	/* if we don't know the size in advance */
	#define AU_UNKNOWN_SIZE ((uint32_t)(~0))

	static const AVCodecTag codec_au_tags[] = {
	{ AV_CODEC_ID_PCM_MULAW, 1 },
	{ AV_CODEC_ID_PCM_S8, 2 },
	{ AV_CODEC_ID_PCM_S16BE, 3 },
	{ AV_CODEC_ID_PCM_S24BE, 4 },
	{ AV_CODEC_ID_PCM_S32BE, 5 },
	{ AV_CODEC_ID_PCM_F32BE, 6 },
	{ AV_CODEC_ID_PCM_F64BE, 7 },
	{ AV_CODEC_ID_ADPCM_G726LE, 23 },
	{ AV_CODEC_ID_ADPCM_G722,24 },
	{ AV_CODEC_ID_ADPCM_G726LE, 25 },
	{ AV_CODEC_ID_ADPCM_G726LE, 26 },
	{ AV_CODEC_ID_PCM_ALAW, 27 },
	{ AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
	{ AV_CODEC_ID_NONE, 0 },
	};

	#if CONFIG_AU_DEMUXER

	static int au_probe(const AVProbeData *p)
	{
	if (p->buf[0] == '.' && p->buf[1] == 's' &&
	p->buf[2] == 'n' && p->buf[3] == 'd')
	return AVPROBE_SCORE_MAX;
	else
	return 0;
	}

	static int au_read_annotation(AVFormatContext *s, int size)
	{
	static const char keys[][7] = {
	"title",
	"artist",
	"album",
	"track",
	"genre",
	};
	AVIOContext *pb = s->pb;
	enum { PARSE_KEY, PARSE_VALUE, PARSE_FINISHED } state = PARSE_KEY;
	char c;
	AVBPrint bprint;
	char * key = NULL;
	char * value = NULL;
	int ret, i;

	av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);

	while (size-- > 0) {
	if (avio_feof(pb)) {
	av_bprint_finalize(&bprint, NULL);
	av_freep(&key);
	return AVERROR_EOF;
	}
	c = avio_r8(pb);
	switch(state) {
	case PARSE_KEY:
	if (c == '\0') {
	state = PARSE_FINISHED;
	} else if (c == '=') {
	ret = av_bprint_finalize(&bprint, &key);
	if (ret < 0)
	return ret;
	av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
	state = PARSE_VALUE;
	} else {
	av_bprint_chars(&bprint, c, 1);
	}
	break;
	case PARSE_VALUE:
	if (c == '\0' \|\| c == '\n') {
	if (av_bprint_finalize(&bprint, &value) != 0) {
	av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
	} else {
	av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
	for (i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
	if (av_strcasecmp(keys[i], key) == 0) {
	av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
	value = NULL;
	break;
	}
	}
	}
	av_freep(&key);
	av_freep(&value);
	state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
	} else {
	av_bprint_chars(&bprint, c, 1);
	}
	break;
	case PARSE_FINISHED:
	break;
	default:
	/* should never happen */
	av_assert0(0);
	}
	}
	av_bprint_finalize(&bprint, NULL);
	av_freep(&key);
	return 0;
	}

	#define BLOCK_SIZE 1024

	static int au_read_header(AVFormatContext *s)
	{
	int size, data_size = 0;
	unsigned int tag;
	AVIOContext *pb = s->pb;
	unsigned int id, channels, rate;
	int bps, ba = 0;
	enum AVCodecID codec;
	AVStream *st;
	int ret;

	tag = avio_rl32(pb);
	if (tag != MKTAG('.', 's', 'n', 'd'))
	return AVERROR_INVALIDDATA;
	size = avio_rb32(pb); /* header size */
	data_size = avio_rb32(pb); /* data size in bytes */

	if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
	av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
	return AVERROR_INVALIDDATA;
	}

	id = avio_rb32(pb);
	rate = avio_rb32(pb);
	channels = avio_rb32(pb);

	if (size > 24) {
	/* parse annotation field to get metadata */
	ret = au_read_annotation(s, size - 24);
	if (ret < 0)
	return ret;
	}

	codec = ff_codec_get_id(codec_au_tags, id);

	if (codec == AV_CODEC_ID_NONE) {
	avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
	return AVERROR_PATCHWELCOME;
	}

	bps = av_get_bits_per_sample(codec);
	if (codec == AV_CODEC_ID_ADPCM_G726LE) {
	if (id == MKBETAG('7','2','6','2')) {
	bps = 2;
	} else {
	const uint8_t bpcss[] = {4, 0, 3, 5};
	av_assert0(id >= 23 && id < 23 + 4);
	ba = bpcss[id - 23];
	bps = bpcss[id - 23];
	}
	} else if (!bps) {
	avpriv_request_sample(s, "Unknown bits per sample");
	return AVERROR_PATCHWELCOME;
	}

	if (channels == 0 \|\| channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
	av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
	return AVERROR_INVALIDDATA;
	}

	if (rate == 0 \|\| rate > INT_MAX) {
	av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
	return AVERROR_INVALIDDATA;
	}

	st = avformat_new_stream(s, NULL);
	if (!st)
	return AVERROR(ENOMEM);
	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
	st->codecpar->codec_tag = id;
	st->codecpar->codec_id = codec;
	st->codecpar->channels = channels;
	st->codecpar->sample_rate = rate;
	st->codecpar->bits_per_coded_sample = bps;
	st->codecpar->bit_rate = channels * rate * bps;
	st->codecpar->block_align = ba ? ba : FFMAX(bps * st->codecpar->channels / 8, 1);
	if (data_size != AU_UNKNOWN_SIZE)
	st->duration = (((int64_t)data_size)<<3) / (st->codecpar->channels * (int64_t)bps);

	st->start_time = 0;
	avpriv_set_pts_info(st, 64, 1, rate);

	return 0;
	}

	AVInputFormat ff_au_demuxer = {
	.name = "au",
	.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
	.read_probe = au_probe,
	.read_header = au_read_header,
	.read_packet = ff_pcm_read_packet,
	.read_seek = ff_pcm_read_seek,
	.codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
	};

	#endif /* CONFIG_AU_DEMUXER */

	#if CONFIG_AU_MUXER

	typedef struct AUContext {
	uint32_t header_size;
	} AUContext;

	#include "rawenc.h"

	static int au_get_annotations(AVFormatContext s, AVBPrint annotations)
	{
	static const char keys[][7] = {
	"Title",
	"Artist",
	"Album",
	"Track",
	"Genre",
	};
	int cnt = 0;
	AVDictionary *m = s->metadata;
	AVDictionaryEntry *t = NULL;

	for (int i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
	t = av_dict_get(m, keys[i], NULL, 0);
	if (t != NULL) {
	if (cnt++)
	av_bprint_chars(annotations, '\n', 1);
	av_bprintf(annotations, "%s=%s", keys[i], t->value);
	}
	}
	/* The specification requires the annotation field to be zero-terminated
	* and its length to be a multiple of eight, so pad with 0's */
	av_bprint_chars(annotations, '\0', 8);
	return av_bprint_is_complete(annotations) ? 0 : AVERROR(ENOMEM);
	}

	static int au_write_header(AVFormatContext *s)
	{
	int ret;
	AUContext *au = s->priv_data;
	AVIOContext *pb = s->pb;
	AVCodecParameters *par = s->streams[0]->codecpar;
	AVBPrint annotations;

	if (s->nb_streams != 1) {
	av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
	return AVERROR(EINVAL);
	}

	par->codec_tag = ff_codec_get_tag(codec_au_tags, par->codec_id);
	if (!par->codec_tag) {
	av_log(s, AV_LOG_ERROR, "unsupported codec\n");
	return AVERROR(EINVAL);
	}

	av_bprint_init(&annotations, 0, INT_MAX - 24);
	ret = au_get_annotations(s, &annotations);
	if (ret < 0)
	goto fail;
	au->header_size = 24 + annotations.len & ~7;

	ffio_wfourcc(pb, ".snd"); /* magic number */
	avio_wb32(pb, au->header_size); /* header size */
	avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
	avio_wb32(pb, par->codec_tag); /* codec ID */
	avio_wb32(pb, par->sample_rate);
	avio_wb32(pb, par->channels);
	avio_write(pb, annotations.str, annotations.len & ~7);

	fail:
	av_bprint_finalize(&annotations, NULL);

	return ret;
	}

	static int au_write_trailer(AVFormatContext *s)
	{
	AVIOContext *pb = s->pb;
	AUContext *au = s->priv_data;
	int64_t file_size = avio_tell(pb);

	if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && file_size < INT32_MAX) {
	/* update file size */
	avio_seek(pb, 8, SEEK_SET);
	avio_wb32(pb, (uint32_t)(file_size - au->header_size));
	avio_seek(pb, file_size, SEEK_SET);
	}

	return 0;
	}

	AVOutputFormat ff_au_muxer = {
	.name = "au",
	.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
	.mime_type = "audio/basic",
	.extensions = "au",
	.priv_data_size = sizeof(AUContext),
	.audio_codec = AV_CODEC_ID_PCM_S16BE,
	.video_codec = AV_CODEC_ID_NONE,
	.write_header = au_write_header,
	.write_packet = ff_raw_write_packet,
	.write_trailer = au_write_trailer,
	.codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
	.flags = AVFMT_NOTIMESTAMPS,
	};

	#endif /* CONFIG_AU_MUXER */