[libav.git] / libavformat / vqf.c

/*
 * VQF demuxer
 * Copyright (c) 2009 Vitor Sessak
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "avformat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"

typedef struct VqfContext {
    int frame_bit_len;
    uint8_t last_frame_bits;
    int remaining_bits;
} VqfContext;

static int vqf_probe(AVProbeData *probe_packet)
{
    if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
        return 0;

    if (!memcmp(probe_packet->buf + 4, "97012000", 8))
        return AVPROBE_SCORE_MAX;

    if (!memcmp(probe_packet->buf + 4, "00052200", 8))
        return AVPROBE_SCORE_MAX;

    return AVPROBE_SCORE_MAX/2;
}

static void add_metadata(AVFormatContext *s, const char *tag,
                         unsigned int tag_len, unsigned int remaining)
{
    int len = FFMIN(tag_len, remaining);
    char *buf;

    if (len == UINT_MAX)
        return;

    buf = av_malloc(len+1);
    if (!buf)
        return;
    avio_read(s->pb, buf, len);
    buf[len] = 0;
    av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
}

static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
    VqfContext *c = s->priv_data;
    AVStream *st  = avformat_new_stream(s, NULL);
    int chunk_tag;
    int rate_flag = -1;
    int header_size;
    int read_bitrate = 0;
    int size;

    if (!st)
        return AVERROR(ENOMEM);

    avio_skip(s->pb, 12);

    header_size = avio_rb32(s->pb);

    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
    st->codec->codec_id   = CODEC_ID_TWINVQ;
    st->start_time = 0;

    do {
        int len;
        chunk_tag = avio_rl32(s->pb);

        if (chunk_tag == MKTAG('D','A','T','A'))
            break;

        len = avio_rb32(s->pb);

        if ((unsigned) len > INT_MAX/2) {
            av_log(s, AV_LOG_ERROR, "Malformed header\n");
            return -1;
        }

        header_size -= 8;

        switch(chunk_tag){
        case MKTAG('C','O','M','M'):
            st->codec->channels = avio_rb32(s->pb) + 1;
            read_bitrate        = avio_rb32(s->pb);
            rate_flag           = avio_rb32(s->pb);
            avio_skip(s->pb, len-12);

            st->codec->bit_rate              = read_bitrate*1000;
            break;
        case MKTAG('N','A','M','E'):
            add_metadata(s, "title"    , len, header_size);
            break;
        case MKTAG('(','c',')',' '):
            add_metadata(s, "copyright", len, header_size);
            break;
        case MKTAG('A','U','T','H'):
            add_metadata(s, "author"   , len, header_size);
            break;
        case MKTAG('A','L','B','M'):
            add_metadata(s, "album"    , len, header_size);
            break;
        case MKTAG('T','R','C','K'):
            add_metadata(s, "track"    , len, header_size);
            break;
        case MKTAG('C','O','M','T'):
            add_metadata(s, "comment"  , len, header_size);
            break;
        case MKTAG('F','I','L','E'):
            add_metadata(s, "filename" , len, header_size);
            break;
        case MKTAG('D','S','I','Z'):
            add_metadata(s, "size"     , len, header_size);
            break;
        case MKTAG('D','A','T','E'):
            add_metadata(s, "date"     , len, header_size);
            break;
        case MKTAG('G','E','N','R'):
            add_metadata(s, "genre"    , len, header_size);
            break;
        default:
            av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n",
                   ((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1],
                   ((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]);
            avio_skip(s->pb, FFMIN(len, header_size));
            break;
        }

        header_size -= len;

    } while (header_size >= 0);

    switch (rate_flag) {
    case -1:
        av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
        return -1;
    case 44:
        st->codec->sample_rate = 44100;
        break;
    case 22:
        st->codec->sample_rate = 22050;
        break;
    case 11:
        st->codec->sample_rate = 11025;
        break;
    default:
        st->codec->sample_rate = rate_flag*1000;
        break;
    }

    switch (((st->codec->sample_rate/1000) << 8) +
            read_bitrate/st->codec->channels) {
    case (11<<8) + 8 :
    case (8 <<8) + 8 :
    case (11<<8) + 10:
    case (22<<8) + 32:
        size = 512;
        break;
    case (16<<8) + 16:
    case (22<<8) + 20:
    case (22<<8) + 24:
        size = 1024;
        break;
    case (44<<8) + 40:
    case (44<<8) + 48:
        size = 2048;
        break;
    default:
        av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
               st->codec->sample_rate, st->codec->bit_rate);
        return -1;
    }
    c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
    av_set_pts_info(st, 64, 1, st->codec->sample_rate);

    return 0;
}

static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    VqfContext *c = s->priv_data;
    int ret;
    int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;

    pkt->pos          = avio_tell(s->pb);
    pkt->stream_index = 0;

    if (av_new_packet(pkt, size+2) < 0)
        return AVERROR(EIO);

    pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
    pkt->data[1] = c->last_frame_bits;
    ret = avio_read(s->pb, pkt->data+2, size);

    if (ret<=0) {
        av_free_packet(pkt);
        return AVERROR(EIO);
    }

    c->last_frame_bits = pkt->data[size+1];
    c->remaining_bits  = (size << 3) - c->frame_bit_len + c->remaining_bits;

    return size+2;
}

static int vqf_read_seek(AVFormatContext *s,
                         int stream_index, int64_t timestamp, int flags)
{
    VqfContext *c = s->priv_data;
    AVStream *st;
    int ret;
    int64_t pos;

    st = s->streams[stream_index];
    pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
                         st->time_base.num,
                         st->time_base.den * (int64_t)c->frame_bit_len,
                         (flags & AVSEEK_FLAG_BACKWARD) ?
                                                   AV_ROUND_DOWN : AV_ROUND_UP);
    pos *= c->frame_bit_len;

    st->cur_dts = av_rescale(pos, st->time_base.den,
                             st->codec->bit_rate * (int64_t)st->time_base.num);

    if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
        return ret;

    c->remaining_bits = -7 - ((pos-7)&7);
    return 0;
}

AVInputFormat ff_vqf_demuxer = {
    .name           = "vqf",
    .long_name      = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
    .priv_data_size = sizeof(VqfContext),
    .read_probe     = vqf_probe,
    .read_header    = vqf_read_header,
    .read_packet    = vqf_read_packet,
    .read_seek      = vqf_read_seek,
    .extensions = "vqf",
};
Commit	Line	Data
616e899c VS	1	/*
	2	* VQF demuxer
	3	* Copyright (c) 2009 Vitor Sessak
	4	*
2912e87a	5	* This file is part of Libav.
616e899c	6	*
2912e87a	7	* Libav is free software; you can redistribute it and/or
616e899c VS	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
2912e87a	12	* Libav is distributed in the hope that it will be useful,
616e899c VS	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
2912e87a	18	* License along with Libav; if not, write to the Free Software
616e899c VS	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include "avformat.h"
	23	#include "libavutil/intreadwrite.h"
d2d67e42	24	#include "libavutil/dict.h"
0ebcdf5c	25	#include "libavutil/mathematics.h"
616e899c VS	26
	27	typedef struct VqfContext {
	28	int frame_bit_len;
	29	uint8_t last_frame_bits;
	30	int remaining_bits;
	31	} VqfContext;
	32
	33	static int vqf_probe(AVProbeData *probe_packet)
	34	{
	35	if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
	36	return 0;
	37
	38	if (!memcmp(probe_packet->buf + 4, "97012000", 8))
	39	return AVPROBE_SCORE_MAX;
	40
	41	if (!memcmp(probe_packet->buf + 4, "00052200", 8))
	42	return AVPROBE_SCORE_MAX;
	43
	44	return AVPROBE_SCORE_MAX/2;
	45	}
	46
	47	static void add_metadata(AVFormatContext s, const char tag,
	48	unsigned int tag_len, unsigned int remaining)
	49	{
12ad6671 MN	50	int len = FFMIN(tag_len, remaining);
12ad6671 MN	51	char *buf;
616e899c	52
12ad6671 MN	53	if (len == UINT_MAX)
12ad6671 MN	54	return;
616e899c	55
12ad6671 MN	56	buf = av_malloc(len+1);
	57	if (!buf)
	58	return;
b7effd4e	59	avio_read(s->pb, buf, len);
616e899c	60	buf[len] = 0;
d2d67e42	61	av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
616e899c VS	62	}
	63
	64	static int vqf_read_header(AVFormatContext s, AVFormatParameters ap)
	65	{
	66	VqfContext *c = s->priv_data;
3b3bbdd3	67	AVStream *st = avformat_new_stream(s, NULL);
616e899c VS	68	int chunk_tag;
	69	int rate_flag = -1;
	70	int header_size;
	71	int read_bitrate = 0;
	72	int size;
	73
	74	if (!st)
	75	return AVERROR(ENOMEM);
	76
45a8a02a	77	avio_skip(s->pb, 12);
616e899c	78
b7effd4e	79	header_size = avio_rb32(s->pb);
616e899c	80
72415b2a	81	st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
616e899c VS	82	st->codec->codec_id = CODEC_ID_TWINVQ;
	83	st->start_time = 0;
	84
	85	do {
	86	int len;
b7effd4e	87	chunk_tag = avio_rl32(s->pb);
616e899c VS	88
	89	if (chunk_tag == MKTAG('D','A','T','A'))
	90	break;
	91
b7effd4e	92	len = avio_rb32(s->pb);
616e899c VS	93
	94	if ((unsigned) len > INT_MAX/2) {
	95	av_log(s, AV_LOG_ERROR, "Malformed header\n");
	96	return -1;
	97	}
	98
	99	header_size -= 8;
	100
	101	switch(chunk_tag){
	102	case MKTAG('C','O','M','M'):
b7effd4e AK	103	st->codec->channels = avio_rb32(s->pb) + 1;
	104	read_bitrate = avio_rb32(s->pb);
	105	rate_flag = avio_rb32(s->pb);
45a8a02a	106	avio_skip(s->pb, len-12);
616e899c VS	107
616e899c VS	108	st->codec->bit_rate = read_bitrate*1000;
616e899c VS	109	break;
	110	case MKTAG('N','A','M','E'):
	111	add_metadata(s, "title" , len, header_size);
	112	break;
	113	case MKTAG('(','c',')',' '):
	114	add_metadata(s, "copyright", len, header_size);
	115	break;
	116	case MKTAG('A','U','T','H'):
	117	add_metadata(s, "author" , len, header_size);
	118	break;
	119	case MKTAG('A','L','B','M'):
	120	add_metadata(s, "album" , len, header_size);
	121	break;
	122	case MKTAG('T','R','C','K'):
	123	add_metadata(s, "track" , len, header_size);
	124	break;
	125	case MKTAG('C','O','M','T'):
	126	add_metadata(s, "comment" , len, header_size);
	127	break;
	128	case MKTAG('F','I','L','E'):
	129	add_metadata(s, "filename" , len, header_size);
	130	break;
	131	case MKTAG('D','S','I','Z'):
	132	add_metadata(s, "size" , len, header_size);
	133	break;
	134	case MKTAG('D','A','T','E'):
	135	add_metadata(s, "date" , len, header_size);
	136	break;
	137	case MKTAG('G','E','N','R'):
	138	add_metadata(s, "genre" , len, header_size);
	139	break;
	140	default:
	141	av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n",
	142	((char)&chunk_tag)[0], ((char)&chunk_tag)[1],
	143	((char)&chunk_tag)[2], ((char)&chunk_tag)[3]);
45a8a02a	144	avio_skip(s->pb, FFMIN(len, header_size));
616e899c VS	145	break;
	146	}
	147
	148	header_size -= len;
	149
	150	} while (header_size >= 0);
	151
	152	switch (rate_flag) {
	153	case -1:
	154	av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
	155	return -1;
	156	case 44:
	157	st->codec->sample_rate = 44100;
	158	break;
	159	case 22:
	160	st->codec->sample_rate = 22050;
	161	break;
	162	case 11:
	163	st->codec->sample_rate = 11025;
	164	break;
	165	default:
	166	st->codec->sample_rate = rate_flag*1000;
	167	break;
	168	}
	169
	170	switch (((st->codec->sample_rate/1000) << 8) +
	171	read_bitrate/st->codec->channels) {
	172	case (11<<8) + 8 :
	173	case (8 <<8) + 8 :
	174	case (11<<8) + 10:
	175	case (22<<8) + 32:
	176	size = 512;
	177	break;
	178	case (16<<8) + 16:
	179	case (22<<8) + 20:
	180	case (22<<8) + 24:
	181	size = 1024;
	182	break;
	183	case (44<<8) + 40:
	184	case (44<<8) + 48:
	185	size = 2048;
	186	break;
	187	default:
	188	av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
	189	st->codec->sample_rate, st->codec->bit_rate);
	190	return -1;
	191	}
	192	c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
efd8b009	193	av_set_pts_info(st, 64, 1, st->codec->sample_rate);
616e899c VS	194
	195	return 0;
	196	}
	197
	198	static int vqf_read_packet(AVFormatContext s, AVPacket pkt)
	199	{
	200	VqfContext *c = s->priv_data;
	201	int ret;
	202	int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
	203
a2704c97	204	pkt->pos = avio_tell(s->pb);
616e899c VS	205	pkt->stream_index = 0;
	206
	207	if (av_new_packet(pkt, size+2) < 0)
	208	return AVERROR(EIO);
	209
	210	pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
	211	pkt->data[1] = c->last_frame_bits;
b7effd4e	212	ret = avio_read(s->pb, pkt->data+2, size);
616e899c VS	213
	214	if (ret<=0) {
	215	av_free_packet(pkt);
	216	return AVERROR(EIO);
	217	}
	218
	219	c->last_frame_bits = pkt->data[size+1];
	220	c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
	221
	222	return size+2;
	223	}
	224
	225	static int vqf_read_seek(AVFormatContext *s,
	226	int stream_index, int64_t timestamp, int flags)
	227	{
	228	VqfContext *c = s->priv_data;
	229	AVStream *st;
	230	int ret;
	231	int64_t pos;
	232
	233	st = s->streams[stream_index];
	234	pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
	235	st->time_base.num,
	236	st->time_base.den * (int64_t)c->frame_bit_len,
	237	(flags & AVSEEK_FLAG_BACKWARD) ?
	238	AV_ROUND_DOWN : AV_ROUND_UP);
	239	pos *= c->frame_bit_len;
	240
	241	st->cur_dts = av_rescale(pos, st->time_base.den,
	242	st->codec->bit_rate * (int64_t)st->time_base.num);
	243
6b4aa5da	244	if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
616e899c VS	245	return ret;
	246
	247	c->remaining_bits = -7 - ((pos-7)&7);
	248	return 0;
	249	}
	250
c6610a21	251	AVInputFormat ff_vqf_demuxer = {
dfc2c4d9 AK	252	.name = "vqf",
	253	.long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
	254	.priv_data_size = sizeof(VqfContext),
	255	.read_probe = vqf_probe,
	256	.read_header = vqf_read_header,
	257	.read_packet = vqf_read_packet,
	258	.read_seek = vqf_read_seek,
616e899c VS	259	.extensions = "vqf",
616e899c VS	260	};