[deb_ffmpeg.git] / ffmpeg / libavformat / adtsenc.c

/*
 * ADTS muxer.
 * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
 *                    Mans Rullgard <mans@mansr.com>
 *
 * 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 "libavcodec/get_bits.h"
#include "libavcodec/put_bits.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/mpeg4audio.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "apetag.h"
#include "id3v2.h"

#define ADTS_HEADER_SIZE 7

typedef struct {
    AVClass *class;
    int write_adts;
    int objecttype;
    int sample_rate_index;
    int channel_conf;
    int pce_size;
    int apetag;
    int id3v2tag;
    uint8_t pce_data[MAX_PCE_SIZE];
} ADTSContext;

#define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1)

static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size)
{
    GetBitContext gb;
    PutBitContext pb;
    MPEG4AudioConfig m4ac;
    int off;

    init_get_bits(&gb, buf, size * 8);
    off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
    if (off < 0)
        return off;
    skip_bits_long(&gb, off);
    adts->objecttype        = m4ac.object_type - 1;
    adts->sample_rate_index = m4ac.sampling_index;
    adts->channel_conf      = m4ac.chan_config;

    if (adts->objecttype > 3U) {
        av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
        return AVERROR_INVALIDDATA;
    }
    if (adts->sample_rate_index == 15) {
        av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
        return AVERROR_INVALIDDATA;
    }
    if (get_bits(&gb, 1)) {
        av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
        return AVERROR_INVALIDDATA;
    }
    if (get_bits(&gb, 1)) {
        av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
        return AVERROR_INVALIDDATA;
    }
    if (get_bits(&gb, 1)) {
        av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n");
        return AVERROR_INVALIDDATA;
    }
    if (!adts->channel_conf) {
        init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);

        put_bits(&pb, 3, 5); //ID_PCE
        adts->pce_size = (avpriv_copy_pce_data(&pb, &gb) + 3) / 8;
        flush_put_bits(&pb);
    }

    adts->write_adts = 1;

    return 0;
}

static int adts_write_header(AVFormatContext *s)
{
    ADTSContext *adts = s->priv_data;
    AVCodecContext *avc = s->streams[0]->codec;

    if (adts->id3v2tag)
        ff_id3v2_write_simple(s, 4, ID3v2_DEFAULT_MAGIC);
    if (avc->extradata_size > 0)
        return adts_decode_extradata(s, adts, avc->extradata,
                                     avc->extradata_size);

    return 0;
}

static int adts_write_frame_header(ADTSContext *ctx,
                                   uint8_t *buf, int size, int pce_size)
{
    PutBitContext pb;

    unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size;
    if (full_frame_size > ADTS_MAX_FRAME_BYTES) {
        av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n",
               full_frame_size, ADTS_MAX_FRAME_BYTES);
        return AVERROR_INVALIDDATA;
    }

    init_put_bits(&pb, buf, ADTS_HEADER_SIZE);

    /* adts_fixed_header */
    put_bits(&pb, 12, 0xfff);   /* syncword */
    put_bits(&pb, 1, 0);        /* ID */
    put_bits(&pb, 2, 0);        /* layer */
    put_bits(&pb, 1, 1);        /* protection_absent */
    put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
    put_bits(&pb, 4, ctx->sample_rate_index);
    put_bits(&pb, 1, 0);        /* private_bit */
    put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
    put_bits(&pb, 1, 0);        /* original_copy */
    put_bits(&pb, 1, 0);        /* home */

    /* adts_variable_header */
    put_bits(&pb, 1, 0);        /* copyright_identification_bit */
    put_bits(&pb, 1, 0);        /* copyright_identification_start */
    put_bits(&pb, 13, full_frame_size); /* aac_frame_length */
    put_bits(&pb, 11, 0x7ff);   /* adts_buffer_fullness */
    put_bits(&pb, 2, 0);        /* number_of_raw_data_blocks_in_frame */

    flush_put_bits(&pb);

    return 0;
}

static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    ADTSContext *adts = s->priv_data;
    AVIOContext *pb = s->pb;
    uint8_t buf[ADTS_HEADER_SIZE];

    if (!pkt->size)
        return 0;
    if (adts->write_adts) {
        int err = adts_write_frame_header(adts, buf, pkt->size,
                                             adts->pce_size);
        if (err < 0)
            return err;
        avio_write(pb, buf, ADTS_HEADER_SIZE);
        if (adts->pce_size) {
            avio_write(pb, adts->pce_data, adts->pce_size);
            adts->pce_size = 0;
        }
    }
    avio_write(pb, pkt->data, pkt->size);

    return 0;
}

static int adts_write_trailer(AVFormatContext *s)
{
    ADTSContext *adts = s->priv_data;

    if (adts->apetag)
        ff_ape_write_tag(s);

    return 0;
}

#define ENC AV_OPT_FLAG_ENCODING_PARAM
#define OFFSET(obj) offsetof(ADTSContext, obj)
static const AVOption options[] = {
    { "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC},
    { "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC},
    { NULL },
};

static const AVClass adts_muxer_class = {
    .class_name     = "ADTS muxer",
    .item_name      = av_default_item_name,
    .option         = options,
    .version        = LIBAVUTIL_VERSION_INT,
};

AVOutputFormat ff_adts_muxer = {
    .name              = "adts",
    .long_name         = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"),
    .mime_type         = "audio/aac",
    .extensions        = "aac,adts",
    .priv_data_size    = sizeof(ADTSContext),
    .audio_codec       = AV_CODEC_ID_AAC,
    .video_codec       = AV_CODEC_ID_NONE,
    .write_header      = adts_write_header,
    .write_packet      = adts_write_packet,
    .write_trailer     = adts_write_trailer,
    .priv_class        = &adts_muxer_class,
    .flags             = AVFMT_NOTIMESTAMPS,
};
Commit	Line	Data
	1	/*
	2	* ADTS muxer.
	3	* Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
	4	* Mans Rullgard <mans@mansr.com>
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	#include "libavcodec/get_bits.h"
	24	#include "libavcodec/put_bits.h"
	25	#include "libavcodec/avcodec.h"
	26	#include "libavcodec/mpeg4audio.h"
	27	#include "libavutil/opt.h"
	28	#include "avformat.h"
	29	#include "apetag.h"
	30	#include "id3v2.h"
	31
	32	#define ADTS_HEADER_SIZE 7
	33
	34	typedef struct {
	35	AVClass *class;
	36	int write_adts;
	37	int objecttype;
	38	int sample_rate_index;
	39	int channel_conf;
	40	int pce_size;
	41	int apetag;
	42	int id3v2tag;
	43	uint8_t pce_data[MAX_PCE_SIZE];
	44	} ADTSContext;
	45
	46	#define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1)
	47
	48	static int adts_decode_extradata(AVFormatContext s, ADTSContext adts, const uint8_t *buf, int size)
	49	{
	50	GetBitContext gb;
	51	PutBitContext pb;
	52	MPEG4AudioConfig m4ac;
	53	int off;
	54
	55	init_get_bits(&gb, buf, size * 8);
	56	off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
	57	if (off < 0)
	58	return off;
	59	skip_bits_long(&gb, off);
	60	adts->objecttype = m4ac.object_type - 1;
	61	adts->sample_rate_index = m4ac.sampling_index;
	62	adts->channel_conf = m4ac.chan_config;
	63
	64	if (adts->objecttype > 3U) {
	65	av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
	66	return AVERROR_INVALIDDATA;
	67	}
	68	if (adts->sample_rate_index == 15) {
	69	av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
	70	return AVERROR_INVALIDDATA;
	71	}
	72	if (get_bits(&gb, 1)) {
	73	av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
	74	return AVERROR_INVALIDDATA;
	75	}
	76	if (get_bits(&gb, 1)) {
	77	av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
	78	return AVERROR_INVALIDDATA;
	79	}
	80	if (get_bits(&gb, 1)) {
	81	av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n");
	82	return AVERROR_INVALIDDATA;
	83	}
	84	if (!adts->channel_conf) {
	85	init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
	86
	87	put_bits(&pb, 3, 5); //ID_PCE
	88	adts->pce_size = (avpriv_copy_pce_data(&pb, &gb) + 3) / 8;
	89	flush_put_bits(&pb);
	90	}
	91
	92	adts->write_adts = 1;
	93
	94	return 0;
	95	}
	96
	97	static int adts_write_header(AVFormatContext *s)
	98	{
	99	ADTSContext *adts = s->priv_data;
	100	AVCodecContext *avc = s->streams[0]->codec;
	101
	102	if (adts->id3v2tag)
	103	ff_id3v2_write_simple(s, 4, ID3v2_DEFAULT_MAGIC);
	104	if (avc->extradata_size > 0)
	105	return adts_decode_extradata(s, adts, avc->extradata,
	106	avc->extradata_size);
	107
	108	return 0;
	109	}
	110
	111	static int adts_write_frame_header(ADTSContext *ctx,
	112	uint8_t *buf, int size, int pce_size)
	113	{
	114	PutBitContext pb;
	115
	116	unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size;
	117	if (full_frame_size > ADTS_MAX_FRAME_BYTES) {
	118	av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n",
	119	full_frame_size, ADTS_MAX_FRAME_BYTES);
	120	return AVERROR_INVALIDDATA;
	121	}
	122
	123	init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
	124
	125	/* adts_fixed_header */
	126	put_bits(&pb, 12, 0xfff); /* syncword */
	127	put_bits(&pb, 1, 0); /* ID */
	128	put_bits(&pb, 2, 0); /* layer */
	129	put_bits(&pb, 1, 1); /* protection_absent */
	130	put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
	131	put_bits(&pb, 4, ctx->sample_rate_index);
	132	put_bits(&pb, 1, 0); /* private_bit */
	133	put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
	134	put_bits(&pb, 1, 0); /* original_copy */
	135	put_bits(&pb, 1, 0); /* home */
	136
	137	/* adts_variable_header */
	138	put_bits(&pb, 1, 0); /* copyright_identification_bit */
	139	put_bits(&pb, 1, 0); /* copyright_identification_start */
	140	put_bits(&pb, 13, full_frame_size); /* aac_frame_length */
	141	put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
	142	put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
	143
	144	flush_put_bits(&pb);
	145
	146	return 0;
	147	}
	148
	149	static int adts_write_packet(AVFormatContext s, AVPacket pkt)
	150	{
	151	ADTSContext *adts = s->priv_data;
	152	AVIOContext *pb = s->pb;
	153	uint8_t buf[ADTS_HEADER_SIZE];
	154
	155	if (!pkt->size)
	156	return 0;
	157	if (adts->write_adts) {
	158	int err = adts_write_frame_header(adts, buf, pkt->size,
	159	adts->pce_size);
	160	if (err < 0)
	161	return err;
	162	avio_write(pb, buf, ADTS_HEADER_SIZE);
	163	if (adts->pce_size) {
	164	avio_write(pb, adts->pce_data, adts->pce_size);
	165	adts->pce_size = 0;
	166	}
	167	}
	168	avio_write(pb, pkt->data, pkt->size);
	169
	170	return 0;
	171	}
	172
	173	static int adts_write_trailer(AVFormatContext *s)
	174	{
	175	ADTSContext *adts = s->priv_data;
	176
	177	if (adts->apetag)
	178	ff_ape_write_tag(s);
	179
	180	return 0;
	181	}
	182
	183	#define ENC AV_OPT_FLAG_ENCODING_PARAM
	184	#define OFFSET(obj) offsetof(ADTSContext, obj)
	185	static const AVOption options[] = {
	186	{ "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC},
	187	{ "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC},
	188	{ NULL },
	189	};
	190
	191	static const AVClass adts_muxer_class = {
	192	.class_name = "ADTS muxer",
	193	.item_name = av_default_item_name,
	194	.option = options,
	195	.version = LIBAVUTIL_VERSION_INT,
	196	};
	197
	198	AVOutputFormat ff_adts_muxer = {
	199	.name = "adts",
	200	.long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"),
	201	.mime_type = "audio/aac",
	202	.extensions = "aac,adts",
	203	.priv_data_size = sizeof(ADTSContext),
	204	.audio_codec = AV_CODEC_ID_AAC,
	205	.video_codec = AV_CODEC_ID_NONE,
	206	.write_header = adts_write_header,
	207	.write_packet = adts_write_packet,
	208	.write_trailer = adts_write_trailer,
	209	.priv_class = &adts_muxer_class,
	210	.flags = AVFMT_NOTIMESTAMPS,
	211	};