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/*
* TTA demuxer
* Copyright (c) 2006 Alex Beregszaszi
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "bitstream.h"
typedef struct {
int totalframes, currentframe;
uint32_t *seektable;
} TTAContext;
static int tta_probe(AVProbeData *p)
{
const uint8_t *d = p->buf;
if (p->buf_size < 4)
return 0;
if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
return 80;
return 0;
}
static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
TTAContext *c = s->priv_data;
AVStream *st;
int i, channels, bps, samplerate, datalen, framelen, start;
start = url_ftell(&s->pb);
if (get_le32(&s->pb) != ff_get_fourcc("TTA1"))
return -1; // not tta file
url_fskip(&s->pb, 2); // FIXME: flags
channels = get_le16(&s->pb);
bps = get_le16(&s->pb);
samplerate = get_le32(&s->pb);
if(samplerate <= 0 || samplerate > 1000000){
av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
return -1;
}
datalen = get_le32(&s->pb);
if(datalen < 0){
av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
return -1;
}
url_fskip(&s->pb, 4); // header crc
framelen = 1.04489795918367346939 * samplerate;
c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
c->currentframe = 0;
if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
av_log(s, AV_LOG_ERROR, "totalframes too large\n");
return -1;
}
c->seektable = av_mallocz(sizeof(uint32_t)*c->totalframes);
if (!c->seektable)
return AVERROR_NOMEM;
for (i = 0; i < c->totalframes; i++)
c->seektable[i] = get_le32(&s->pb);
url_fskip(&s->pb, 4); // seektable crc
st = av_new_stream(s, 0);
// av_set_pts_info(st, 32, 1, 1000);
if (!st)
return AVERROR_NOMEM;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_TTA;
st->codec->channels = channels;
st->codec->sample_rate = samplerate;
st->codec->bits_per_sample = bps;
st->codec->extradata_size = url_ftell(&s->pb) - start;
if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
//this check is redundant as get_buffer should fail
av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
return -1;
}
st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
url_fseek(&s->pb, start, SEEK_SET); // or SEEK_CUR and -size ? :)
get_buffer(&s->pb, st->codec->extradata, st->codec->extradata_size);
return 0;
}
static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
{
TTAContext *c = s->priv_data;
int ret, size;
// FIXME!
if (c->currentframe > c->totalframes)
size = 0;
else
size = c->seektable[c->currentframe];
c->currentframe++;
if (av_new_packet(pkt, size) < 0)
return AVERROR_IO;
pkt->pos = url_ftell(&s->pb);
pkt->stream_index = 0;
ret = get_buffer(&s->pb, pkt->data, size);
if (ret <= 0) {
av_free_packet(pkt);
return AVERROR_IO;
}
pkt->size = ret;
// av_log(s, AV_LOG_INFO, "TTA packet #%d desired size: %d read size: %d at pos %d\n",
// c->currentframe, size, ret, pkt->pos);
return 0; //ret;
}
static int tta_read_close(AVFormatContext *s)
{
TTAContext *c = s->priv_data;
if (c->seektable)
av_free(c->seektable);
return 0;
}
AVInputFormat tta_demuxer = {
"tta",
"true-audio",
sizeof(TTAContext),
tta_probe,
tta_read_header,
tta_read_packet,
tta_read_close,
.extensions = "tta",
};
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