libavformat/amr.c - play-games/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

            
            */


            #include "config_components.h"


            #include "libavutil/channel_layout.h"

            
            #include "libavutil/intreadwrite.h"

            
            #include "avformat.h"

            
            #include "avio_internal.h"

            
            #include "demux.h"

            
            #include "internal.h"

            
            #include "mux.h"

            
            #include "rawdec.h"

            
            #include "rawenc.h"


            typedef struct AMRContext {

            
                FFRawDemuxerContext rawctx;

            
            } AMRContext;


            static const uint8_t AMR_header[6]      = "#!AMR\x0a";

            
            static const uint8_t AMRMC_header[12]   = "#!AMR_MC1.0\x0a";

            
            static const uint8_t AMRWB_header[9]    = "#!AMR-WB\x0a";

            
            static const uint8_t AMRWBMC_header[15] = "#!AMR-WB_MC1.0\x0a";


            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_DEMUXER

            
            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"


                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[19] = { 0 };

            
                int read, back = 0, ret;


                ret = ffio_ensure_seekback(s->pb, sizeof(header));

            
                if (ret < 0)

            
                    return ret;


                read = avio_read(pb, header, sizeof(header));

            
                if (read < 0)

            
                    return read;


                st = avformat_new_stream(s, NULL);

            
                if (!st)

            
                    return AVERROR(ENOMEM);

            
                if (!memcmp(header, AMR_header, sizeof(AMR_header))) {

            
                    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->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

            
                    back = read - sizeof(AMR_header);

            
                } else if (!memcmp(header, AMRWB_header, sizeof(AMRWB_header))) {

            
                    st->codecpar->codec_tag   = MKTAG('s', 'a', 'w', 'b');

            
                    st->codecpar->codec_id    = AV_CODEC_ID_AMR_WB;

            
                    st->codecpar->sample_rate = 16000;

            
                    st->codecpar->ch_layout      = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

            
                    back = read - sizeof(AMRWB_header);

            
                } else if (!memcmp(header, AMRMC_header, sizeof(AMRMC_header))) {

            
                    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->ch_layout.nb_channels = AV_RL32(header + 12);

            
                    back = read - 4 - sizeof(AMRMC_header);

            
                } else if (!memcmp(header, AMRWBMC_header, sizeof(AMRWBMC_header))) {

            
                    st->codecpar->codec_tag   = MKTAG('s', 'a', 'w', 'b');

            
                    st->codecpar->codec_id    = AV_CODEC_ID_AMR_WB;

            
                    st->codecpar->sample_rate = 16000;

            
                    st->codecpar->ch_layout.nb_channels = AV_RL32(header + 15);

            
                    back = read - 4 - sizeof(AMRWBMC_header);

            
                } else {

            
                    return AVERROR_INVALIDDATA;

            
                }


                if (st->codecpar->ch_layout.nb_channels < 1)

            
                    return AVERROR_INVALIDDATA;


                st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

            
                ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;

            
                avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);


                if (back > 0)

            
                    avio_seek(pb, -back, SEEK_CUR);


                return 0;

            
            }


            const FFInputFormat ff_amr_demuxer = {

            
                .p.name         = "amr",

            
                .p.long_name    = NULL_IF_CONFIG_SMALL("3GPP AMR"),

            
                .p.flags        = AVFMT_GENERIC_INDEX,

            
                .p.priv_class   = &ff_raw_demuxer_class,

            
                .priv_data_size = sizeof(AMRContext),

            
                .read_probe     = amr_probe,

            
                .read_header    = amr_read_header,

            
                .read_packet    = ff_raw_read_partial_packet,

            
            };

            
            #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->ch_layout      = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

            
                st->codecpar->codec_type     = AVMEDIA_TYPE_AUDIO;

            
                ffstream(st)->need_parsing   = AVSTREAM_PARSE_FULL_RAW;

            
                avpriv_set_pts_info(st, 64, 1, 8000);


                return 0;

            
            }


            const FFInputFormat ff_amrnb_demuxer = {

            
                .p.name         = "amrnb",

            
                .p.long_name    = NULL_IF_CONFIG_SMALL("raw AMR-NB"),

            
                .p.flags        = AVFMT_GENERIC_INDEX,

            
                .p.priv_class   = &ff_raw_demuxer_class,

            
                .priv_data_size = sizeof(AMRContext),

            
                .read_probe     = amrnb_probe,

            
                .read_header    = amrnb_read_header,

            
                .read_packet    = ff_raw_read_partial_packet,

            
            };

            
            #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->ch_layout      = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

            
                st->codecpar->codec_type     = AVMEDIA_TYPE_AUDIO;

            
                ffstream(st)->need_parsing   = AVSTREAM_PARSE_FULL_RAW;

            
                avpriv_set_pts_info(st, 64, 1, 16000);


                return 0;

            
            }


            const FFInputFormat ff_amrwb_demuxer = {

            
                .p.name         = "amrwb",

            
                .p.long_name    = NULL_IF_CONFIG_SMALL("raw AMR-WB"),

            
                .p.flags        = AVFMT_GENERIC_INDEX,

            
                .p.priv_class   = &ff_raw_demuxer_class,

            
                .priv_data_size = sizeof(AMRContext),

            
                .read_probe     = amrwb_probe,

            
                .read_header    = amrwb_read_header,

            
                .read_packet    = ff_raw_read_partial_packet,

            
            };

            
            #endif


            #if CONFIG_AMR_MUXER

            
            static int amr_write_header(AVFormatContext *s)

            
            {

            
                AVIOContext    *pb  = s->pb;

            
                AVCodecParameters *par = s->streams[0]->codecpar;


                if (par->codec_id == AV_CODEC_ID_AMR_NB) {

            
                    avio_write(pb, AMR_header,   sizeof(AMR_header));   /* magic number */

            
                } else if (par->codec_id == AV_CODEC_ID_AMR_WB) {

            
                    avio_write(pb, AMRWB_header, sizeof(AMRWB_header)); /* magic number */

            
                } else {

            
                    return -1;

            
                }

            
                return 0;

            
            }


            const FFOutputFormat ff_amr_muxer = {

            
                .p.name            = "amr",

            
                .p.long_name       = NULL_IF_CONFIG_SMALL("3GPP AMR"),

            
                .p.mime_type       = "audio/amr",

            
                .p.extensions      = "amr",

            
                .p.audio_codec     = AV_CODEC_ID_AMR_NB,

            
                .p.video_codec     = AV_CODEC_ID_NONE,

            
                .p.subtitle_codec  = AV_CODEC_ID_NONE,

            
                .p.flags           = AVFMT_NOTIMESTAMPS,

            
                .flags_internal    = FF_OFMT_FLAG_MAX_ONE_OF_EACH,

            
                .write_header      = amr_write_header,

            
                .write_packet      = ff_raw_write_packet,

            
            };

            
            #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
	*/

	#include "config_components.h"

	#include "libavutil/channel_layout.h"
	#include "libavutil/intreadwrite.h"
	#include "avformat.h"
	#include "avio_internal.h"
	#include "demux.h"
	#include "internal.h"
	#include "mux.h"
	#include "rawdec.h"
	#include "rawenc.h"

	typedef struct AMRContext {
	FFRawDemuxerContext rawctx;
	} AMRContext;

	static const uint8_t AMR_header[6] = "#!AMR\x0a";
	static const uint8_t AMRMC_header[12] = "#!AMR_MC1.0\x0a";
	static const uint8_t AMRWB_header[9] = "#!AMR-WB\x0a";
	static const uint8_t AMRWBMC_header[15] = "#!AMR-WB_MC1.0\x0a";

	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_DEMUXER
	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"

	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[19] = { 0 };
	int read, back = 0, ret;

	ret = ffio_ensure_seekback(s->pb, sizeof(header));
	if (ret < 0)
	return ret;

	read = avio_read(pb, header, sizeof(header));
	if (read < 0)
	return read;

	st = avformat_new_stream(s, NULL);
	if (!st)
	return AVERROR(ENOMEM);
	if (!memcmp(header, AMR_header, sizeof(AMR_header))) {
	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->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
	back = read - sizeof(AMR_header);
	} else if (!memcmp(header, AMRWB_header, sizeof(AMRWB_header))) {
	st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
	st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
	st->codecpar->sample_rate = 16000;
	st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
	back = read - sizeof(AMRWB_header);
	} else if (!memcmp(header, AMRMC_header, sizeof(AMRMC_header))) {
	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->ch_layout.nb_channels = AV_RL32(header + 12);
	back = read - 4 - sizeof(AMRMC_header);
	} else if (!memcmp(header, AMRWBMC_header, sizeof(AMRWBMC_header))) {
	st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
	st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
	st->codecpar->sample_rate = 16000;
	st->codecpar->ch_layout.nb_channels = AV_RL32(header + 15);
	back = read - 4 - sizeof(AMRWBMC_header);
	} else {
	return AVERROR_INVALIDDATA;
	}

	if (st->codecpar->ch_layout.nb_channels < 1)
	return AVERROR_INVALIDDATA;

	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
	ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
	avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

	if (back > 0)
	avio_seek(pb, -back, SEEK_CUR);

	return 0;
	}

	const FFInputFormat ff_amr_demuxer = {
	.p.name = "amr",
	.p.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
	.p.flags = AVFMT_GENERIC_INDEX,
	.p.priv_class = &ff_raw_demuxer_class,
	.priv_data_size = sizeof(AMRContext),
	.read_probe = amr_probe,
	.read_header = amr_read_header,
	.read_packet = ff_raw_read_partial_packet,
	};
	#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->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
	ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
	avpriv_set_pts_info(st, 64, 1, 8000);

	return 0;
	}

	const FFInputFormat ff_amrnb_demuxer = {
	.p.name = "amrnb",
	.p.long_name = NULL_IF_CONFIG_SMALL("raw AMR-NB"),
	.p.flags = AVFMT_GENERIC_INDEX,
	.p.priv_class = &ff_raw_demuxer_class,
	.priv_data_size = sizeof(AMRContext),
	.read_probe = amrnb_probe,
	.read_header = amrnb_read_header,
	.read_packet = ff_raw_read_partial_packet,
	};
	#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->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
	ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
	avpriv_set_pts_info(st, 64, 1, 16000);

	return 0;
	}

	const FFInputFormat ff_amrwb_demuxer = {
	.p.name = "amrwb",
	.p.long_name = NULL_IF_CONFIG_SMALL("raw AMR-WB"),
	.p.flags = AVFMT_GENERIC_INDEX,
	.p.priv_class = &ff_raw_demuxer_class,
	.priv_data_size = sizeof(AMRContext),
	.read_probe = amrwb_probe,
	.read_header = amrwb_read_header,
	.read_packet = ff_raw_read_partial_packet,
	};
	#endif

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

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

	const FFOutputFormat ff_amr_muxer = {
	.p.name = "amr",
	.p.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
	.p.mime_type = "audio/amr",
	.p.extensions = "amr",
	.p.audio_codec = AV_CODEC_ID_AMR_NB,
	.p.video_codec = AV_CODEC_ID_NONE,
	.p.subtitle_codec = AV_CODEC_ID_NONE,
	.p.flags = AVFMT_NOTIMESTAMPS,
	.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
	.write_header = amr_write_header,
	.write_packet = ff_raw_write_packet,
	};
	#endif