libavformat/amr.c - third_party/ffmpeg - Git at Google

 /*
  * amr file format
  * Copyright (c) 2001 FFmpeg project
  *
  * 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
  */

 /*
 Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267

 Only mono files are supported.

 */

 #include "libavutil/channel_layout.h"
 #include "avformat.h"
 #include "internal.h"

 typedef struct {
     uint64_t cumulated_size;
     uint64_t block_count;
 } AMRContext;

 static const char AMR_header[]   = "#!AMR\n";
 static const char AMRWB_header[] = "#!AMR-WB\n";

 static const uint8_t amrnb_packed_size[16] = {
     13, 14, 16, 18, 20, 21, 27, 32, 6, 1, 1, 1, 1, 1, 1, 1
 };
 static const uint8_t amrwb_packed_size[16] = {
     18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 1, 1, 1, 1, 1, 1
 };

 #if CONFIG_AMR_MUXER
 static int amr_write_header(AVFormatContext *s)
 {
     AVIOContext    *pb  = s->pb;
     AVCodecParameters *par = s->streams[0]->codecpar;

     s->priv_data = NULL;

     if (par->codec_id == AV_CODEC_ID_AMR_NB) {
         avio_write(pb, AMR_header,   sizeof(AMR_header)   - 1); /* magic number */
     } else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
         avio_write(pb, AMRWB_header, sizeof(AMRWB_header) - 1); /* magic number */
     } else {
         return -1;
     }
     avio_flush(pb);
     return 0;
 }

 static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     avio_write(s->pb, pkt->data, pkt->size);
     return 0;
 }
 #endif /* CONFIG_AMR_MUXER */

 static int amr_probe(const AVProbeData *p)
 {
     // Only check for "#!AMR" which could be amr-wb, amr-nb.
     // This will also trigger multichannel files: "#!AMR_MC1.0\n" and
     // "#!AMR-WB_MC1.0\n" (not supported)

     if (!memcmp(p->buf, AMR_header, 5))
         return AVPROBE_SCORE_MAX;
     else
         return 0;
 }

 /* amr input */
 static int amr_read_header(AVFormatContext *s)
 {
     AVIOContext *pb = s->pb;
     AVStream *st;
     uint8_t header[9];

     if (avio_read(pb, header, 6) != 6)
         return AVERROR_INVALIDDATA;

     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
     if (memcmp(header, AMR_header, 6)) {
         if (avio_read(pb, header + 6, 3) != 3)
             return AVERROR_INVALIDDATA;
         if (memcmp(header, AMRWB_header, 9)) {
             return -1;
         }

         st->codecpar->codec_tag   = MKTAG('s', 'a', 'w', 'b');
         st->codecpar->codec_id    = AV_CODEC_ID_AMR_WB;
         st->codecpar->sample_rate = 16000;
     } else {
         st->codecpar->codec_tag   = MKTAG('s', 'a', 'm', 'r');
         st->codecpar->codec_id    = AV_CODEC_ID_AMR_NB;
         st->codecpar->sample_rate = 8000;
     }
     st->codecpar->channels   = 1;
     st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

     return 0;
 }

 static int amr_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     AVCodecParameters *par = s->streams[0]->codecpar;
     int read, size = 0, toc, mode;
     int64_t pos = avio_tell(s->pb);
     AMRContext *amr = s->priv_data;

     if (avio_feof(s->pb)) {
         return AVERROR_EOF;
     }

     // FIXME this is wrong, this should rather be in an AVParser
     toc  = avio_r8(s->pb);
     mode = (toc >> 3) & 0x0F;

     if (par->codec_id == AV_CODEC_ID_AMR_NB) {
         size = amrnb_packed_size[mode];
     } else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
         size = amrwb_packed_size[mode];
     }

     if (!size || av_new_packet(pkt, size))
         return AVERROR(EIO);

     if (amr->cumulated_size < UINT64_MAX - size) {
         amr->cumulated_size += size;
         /* Both AMR formats have 50 frames per second */
         s->streams[0]->codecpar->bit_rate = amr->cumulated_size / ++amr->block_count * 8 * 50;
     }

     pkt->stream_index = 0;
     pkt->pos          = pos;
     pkt->data[0]      = toc;
     pkt->duration     = par->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320;
     read              = avio_read(s->pb, pkt->data + 1, size - 1);

     if (read != size - 1) {
         av_packet_unref(pkt);
         if (read < 0)
             return read;
         return AVERROR(EIO);
     }

     return 0;
 }

 #if CONFIG_AMR_DEMUXER
 AVInputFormat ff_amr_demuxer = {
     .name           = "amr",
     .long_name      = NULL_IF_CONFIG_SMALL("3GPP AMR"),
     .priv_data_size = sizeof(AMRContext),
     .read_probe     = amr_probe,
     .read_header    = amr_read_header,
     .read_packet    = amr_read_packet,
     .flags          = AVFMT_GENERIC_INDEX,
 };
 #endif

 #if CONFIG_AMRNB_DEMUXER
 static int amrnb_probe(const AVProbeData *p)
 {
     int mode, i = 0, valid = 0, invalid = 0;
     const uint8_t *b = p->buf;

     while (i < p->buf_size) {
         mode = b[i] >> 3 & 0x0F;
         if (mode < 9 && (b[i] & 0x4) == 0x4) {
             int last = b[i];
             int size = amrnb_packed_size[mode];
             while (size--) {
                 if (b[++i] != last)
                     break;
             }
             if (size > 0) {
                 valid++;
                 i += size;
             }
         } else {
             valid = 0;
             invalid++;
             i++;
         }
     }
     if (valid > 100 && valid >> 4 > invalid)
         return AVPROBE_SCORE_EXTENSION / 2 + 1;
     return 0;
 }

 static int amrnb_read_header(AVFormatContext *s)
 {
     AVStream *st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
     st->codecpar->codec_id       = AV_CODEC_ID_AMR_NB;
     st->codecpar->sample_rate    = 8000;
     st->codecpar->channels       = 1;
     st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
     st->codecpar->codec_type     = AVMEDIA_TYPE_AUDIO;
     avpriv_set_pts_info(st, 64, 1, 8000);

     return 0;
 }

 AVInputFormat ff_amrnb_demuxer = {
     .name           = "amrnb",
     .long_name      = NULL_IF_CONFIG_SMALL("raw AMR-NB"),
     .priv_data_size = sizeof(AMRContext),
     .read_probe     = amrnb_probe,
     .read_header    = amrnb_read_header,
     .read_packet    = amr_read_packet,
     .flags          = AVFMT_GENERIC_INDEX,
 };
 #endif

 #if CONFIG_AMRWB_DEMUXER
 static int amrwb_probe(const AVProbeData *p)
 {
     int mode, i = 0, valid = 0, invalid = 0;
     const uint8_t *b = p->buf;

     while (i < p->buf_size) {
         mode = b[i] >> 3 & 0x0F;
         if (mode < 10 && (b[i] & 0x4) == 0x4) {
             int last = b[i];
             int size = amrwb_packed_size[mode];
             while (size--) {
                 if (b[++i] != last)
                     break;
             }
             if (size > 0) {
                 valid++;
                 i += size;
             }
         } else {
             valid = 0;
             invalid++;
             i++;
         }
     }
     if (valid > 100 && valid >> 4 > invalid)
         return AVPROBE_SCORE_EXTENSION / 2 + 1;
     return 0;
 }

 static int amrwb_read_header(AVFormatContext *s)
 {
     AVStream *st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
     st->codecpar->codec_id       = AV_CODEC_ID_AMR_WB;
     st->codecpar->sample_rate    = 16000;
     st->codecpar->channels       = 1;
     st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
     st->codecpar->codec_type     = AVMEDIA_TYPE_AUDIO;
     avpriv_set_pts_info(st, 64, 1, 16000);

     return 0;
 }

 AVInputFormat ff_amrwb_demuxer = {
     .name           = "amrwb",
     .long_name      = NULL_IF_CONFIG_SMALL("raw AMR-WB"),
     .priv_data_size = sizeof(AMRContext),
     .read_probe     = amrwb_probe,
     .read_header    = amrwb_read_header,
     .read_packet    = amr_read_packet,
     .flags          = AVFMT_GENERIC_INDEX,
 };
 #endif

 #if CONFIG_AMR_MUXER
 AVOutputFormat ff_amr_muxer = {
     .name              = "amr",
     .long_name         = NULL_IF_CONFIG_SMALL("3GPP AMR"),
     .mime_type         = "audio/amr",
     .extensions        = "amr",
     .audio_codec       = AV_CODEC_ID_AMR_NB,
     .video_codec       = AV_CODEC_ID_NONE,
     .write_header      = amr_write_header,
     .write_packet      = amr_write_packet,
     .flags             = AVFMT_NOTIMESTAMPS,
 };
 #endif
	/*
	* amr file format
	* Copyright (c) 2001 FFmpeg project
	*
	* 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
	*/

	/*
	Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267

	Only mono files are supported.

	*/

	#include "libavutil/channel_layout.h"
	#include "avformat.h"
	#include "internal.h"

	typedef struct {
	uint64_t cumulated_size;
	uint64_t block_count;
	} AMRContext;

	static const char AMR_header[] = "#!AMR\n";
	static const char AMRWB_header[] = "#!AMR-WB\n";

	static const uint8_t amrnb_packed_size[16] = {
	13, 14, 16, 18, 20, 21, 27, 32, 6, 1, 1, 1, 1, 1, 1, 1
	};
	static const uint8_t amrwb_packed_size[16] = {
	18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 1, 1, 1, 1, 1, 1
	};

	#if CONFIG_AMR_MUXER
	static int amr_write_header(AVFormatContext *s)
	{
	AVIOContext *pb = s->pb;
	AVCodecParameters *par = s->streams[0]->codecpar;

	s->priv_data = NULL;

	if (par->codec_id == AV_CODEC_ID_AMR_NB) {
	avio_write(pb, AMR_header, sizeof(AMR_header) - 1); /* magic number */
	} else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
	avio_write(pb, AMRWB_header, sizeof(AMRWB_header) - 1); /* magic number */
	} else {
	return -1;
	}
	avio_flush(pb);
	return 0;
	}

	static int amr_write_packet(AVFormatContext s, AVPacket pkt)
	{
	avio_write(s->pb, pkt->data, pkt->size);
	return 0;
	}
	#endif /* CONFIG_AMR_MUXER */

	static int amr_probe(const AVProbeData *p)
	{
	// Only check for "#!AMR" which could be amr-wb, amr-nb.
	// This will also trigger multichannel files: "#!AMR_MC1.0\n" and
	// "#!AMR-WB_MC1.0\n" (not supported)

	if (!memcmp(p->buf, AMR_header, 5))
	return AVPROBE_SCORE_MAX;
	else
	return 0;
	}

	/* amr input */
	static int amr_read_header(AVFormatContext *s)
	{
	AVIOContext *pb = s->pb;
	AVStream *st;
	uint8_t header[9];

	if (avio_read(pb, header, 6) != 6)
	return AVERROR_INVALIDDATA;

	st = avformat_new_stream(s, NULL);
	if (!st)
	return AVERROR(ENOMEM);
	if (memcmp(header, AMR_header, 6)) {
	if (avio_read(pb, header + 6, 3) != 3)
	return AVERROR_INVALIDDATA;
	if (memcmp(header, AMRWB_header, 9)) {
	return -1;
	}

	st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
	st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
	st->codecpar->sample_rate = 16000;
	} else {
	st->codecpar->codec_tag = MKTAG('s', 'a', 'm', 'r');
	st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
	st->codecpar->sample_rate = 8000;
	}
	st->codecpar->channels = 1;
	st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
	avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

	return 0;
	}

	static int amr_read_packet(AVFormatContext s, AVPacket pkt)
	{
	AVCodecParameters *par = s->streams[0]->codecpar;
	int read, size = 0, toc, mode;
	int64_t pos = avio_tell(s->pb);
	AMRContext *amr = s->priv_data;

	if (avio_feof(s->pb)) {
	return AVERROR_EOF;
	}

	// FIXME this is wrong, this should rather be in an AVParser
	toc = avio_r8(s->pb);
	mode = (toc >> 3) & 0x0F;

	if (par->codec_id == AV_CODEC_ID_AMR_NB) {
	size = amrnb_packed_size[mode];
	} else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
	size = amrwb_packed_size[mode];
	}

	if (!size \|\| av_new_packet(pkt, size))
	return AVERROR(EIO);

	if (amr->cumulated_size < UINT64_MAX - size) {
	amr->cumulated_size += size;
	/* Both AMR formats have 50 frames per second */
	s->streams[0]->codecpar->bit_rate = amr->cumulated_size / ++amr->block_count * 8 * 50;
	}

	pkt->stream_index = 0;
	pkt->pos = pos;
	pkt->data[0] = toc;
	pkt->duration = par->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320;
	read = avio_read(s->pb, pkt->data + 1, size - 1);

	if (read != size - 1) {
	av_packet_unref(pkt);
	if (read < 0)
	return read;
	return AVERROR(EIO);
	}

	return 0;
	}

	#if CONFIG_AMR_DEMUXER
	AVInputFormat ff_amr_demuxer = {
	.name = "amr",
	.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
	.priv_data_size = sizeof(AMRContext),
	.read_probe = amr_probe,
	.read_header = amr_read_header,
	.read_packet = amr_read_packet,
	.flags = AVFMT_GENERIC_INDEX,
	};
	#endif

	#if CONFIG_AMRNB_DEMUXER
	static int amrnb_probe(const AVProbeData *p)
	{
	int mode, i = 0, valid = 0, invalid = 0;
	const uint8_t *b = p->buf;

	while (i < p->buf_size) {
	mode = b[i] >> 3 & 0x0F;
	if (mode < 9 && (b[i] & 0x4) == 0x4) {
	int last = b[i];
	int size = amrnb_packed_size[mode];
	while (size--) {
	if (b[++i] != last)
	break;
	}
	if (size > 0) {
	valid++;
	i += size;
	}
	} else {
	valid = 0;
	invalid++;
	i++;
	}
	}
	if (valid > 100 && valid >> 4 > invalid)
	return AVPROBE_SCORE_EXTENSION / 2 + 1;
	return 0;
	}

	static int amrnb_read_header(AVFormatContext *s)
	{
	AVStream *st = avformat_new_stream(s, NULL);
	if (!st)
	return AVERROR(ENOMEM);
	st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
	st->codecpar->sample_rate = 8000;
	st->codecpar->channels = 1;
	st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
	avpriv_set_pts_info(st, 64, 1, 8000);

	return 0;
	}

	AVInputFormat ff_amrnb_demuxer = {
	.name = "amrnb",
	.long_name = NULL_IF_CONFIG_SMALL("raw AMR-NB"),
	.priv_data_size = sizeof(AMRContext),
	.read_probe = amrnb_probe,
	.read_header = amrnb_read_header,
	.read_packet = amr_read_packet,
	.flags = AVFMT_GENERIC_INDEX,
	};
	#endif

	#if CONFIG_AMRWB_DEMUXER
	static int amrwb_probe(const AVProbeData *p)
	{
	int mode, i = 0, valid = 0, invalid = 0;
	const uint8_t *b = p->buf;

	while (i < p->buf_size) {
	mode = b[i] >> 3 & 0x0F;
	if (mode < 10 && (b[i] & 0x4) == 0x4) {
	int last = b[i];
	int size = amrwb_packed_size[mode];
	while (size--) {
	if (b[++i] != last)
	break;
	}
	if (size > 0) {
	valid++;
	i += size;
	}
	} else {
	valid = 0;
	invalid++;
	i++;
	}
	}
	if (valid > 100 && valid >> 4 > invalid)
	return AVPROBE_SCORE_EXTENSION / 2 + 1;
	return 0;
	}

	static int amrwb_read_header(AVFormatContext *s)
	{
	AVStream *st = avformat_new_stream(s, NULL);
	if (!st)
	return AVERROR(ENOMEM);
	st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
	st->codecpar->sample_rate = 16000;
	st->codecpar->channels = 1;
	st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
	avpriv_set_pts_info(st, 64, 1, 16000);

	return 0;
	}

	AVInputFormat ff_amrwb_demuxer = {
	.name = "amrwb",
	.long_name = NULL_IF_CONFIG_SMALL("raw AMR-WB"),
	.priv_data_size = sizeof(AMRContext),
	.read_probe = amrwb_probe,
	.read_header = amrwb_read_header,
	.read_packet = amr_read_packet,
	.flags = AVFMT_GENERIC_INDEX,
	};
	#endif

	#if CONFIG_AMR_MUXER
	AVOutputFormat ff_amr_muxer = {
	.name = "amr",
	.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
	.mime_type = "audio/amr",
	.extensions = "amr",
	.audio_codec = AV_CODEC_ID_AMR_NB,
	.video_codec = AV_CODEC_ID_NONE,
	.write_header = amr_write_header,
	.write_packet = amr_write_packet,
	.flags = AVFMT_NOTIMESTAMPS,
	};
	#endif