148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/*
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* TTA demuxer
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* Copyright (c) 2006 Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "bitstream.h"
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typedef struct {
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int totalframes, currentframe;
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} TTAContext;
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static int tta_probe(AVProbeData *p)
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{
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const uint8_t *d = p->buf;
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if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
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return 80;
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return 0;
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}
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static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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TTAContext *c = s->priv_data;
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AVStream *st;
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int i, channels, bps, samplerate, datalen, framelen;
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uint64_t framepos;
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if (get_le32(&s->pb) != ff_get_fourcc("TTA1"))
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return -1; // not tta file
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url_fskip(&s->pb, 2); // FIXME: flags
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channels = get_le16(&s->pb);
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bps = get_le16(&s->pb);
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samplerate = get_le32(&s->pb);
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if(samplerate <= 0 || samplerate > 1000000){
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av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
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return -1;
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}
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datalen = get_le32(&s->pb);
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if(datalen < 0){
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av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
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return -1;
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}
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url_fskip(&s->pb, 4); // header crc
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framelen = samplerate*256/245;
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c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
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c->currentframe = 0;
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if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
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av_log(s, AV_LOG_ERROR, "totalframes too large\n");
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return -1;
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}
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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av_set_pts_info(st, 64, 1, samplerate);
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st->start_time = 0;
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st->duration = datalen;
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framepos = url_ftell(&s->pb) + 4*c->totalframes + 4;
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for (i = 0; i < c->totalframes; i++) {
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uint32_t size = get_le32(&s->pb);
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av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME);
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framepos += size;
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}
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url_fskip(&s->pb, 4); // seektable crc
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_TTA;
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st->codec->channels = channels;
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st->codec->sample_rate = samplerate;
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st->codec->bits_per_sample = bps;
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st->codec->extradata_size = url_ftell(&s->pb);
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if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
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//this check is redundant as get_buffer should fail
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av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
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return -1;
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}
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st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
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url_fseek(&s->pb, 0, SEEK_SET);
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get_buffer(&s->pb, st->codec->extradata, st->codec->extradata_size);
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return 0;
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}
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static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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TTAContext *c = s->priv_data;
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AVStream *st = s->streams[0];
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int size;
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// FIXME!
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if (c->currentframe > c->totalframes)
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return -1;
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size = st->index_entries[c->currentframe++].size;
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return av_get_packet(&s->pb, pkt, size);
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}
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static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
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{
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TTAContext *c = s->priv_data;
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AVStream *st = s->streams[stream_index];
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int index = av_index_search_timestamp(st, timestamp, flags);
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if (index < 0)
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return -1;
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c->currentframe = index;
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url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
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return 0;
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}
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AVInputFormat tta_demuxer = {
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"tta",
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"true-audio",
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sizeof(TTAContext),
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tta_probe,
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tta_read_header,
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tta_read_packet,
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NULL,
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tta_read_seek,
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.extensions = "tta",
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};
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