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https://github.com/FFmpeg/FFmpeg.git
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139 lines
3.8 KiB
C
139 lines
3.8 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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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#define ALT_BITSREAM_READER_LE
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#include "bitstream.h"
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typedef struct {
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int totalframes, currentframe;
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uint32_t *seektable;
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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 (p->buf_size < 4)
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return 0;
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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, start;
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start = url_ftell(&s->pb);
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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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datalen = get_le32(&s->pb);
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url_fskip(&s->pb, 4); // header crc
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framelen = 1.04489795918367346939 * samplerate;
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c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
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c->currentframe = 0;
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c->seektable = av_mallocz(sizeof(uint32_t)*c->totalframes);
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if (!c->seektable)
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return AVERROR_NOMEM;
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for (i = 0; i < c->totalframes; i++)
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c->seektable[i] = get_le32(&s->pb);
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url_fskip(&s->pb, 4); // seektable crc
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st = av_new_stream(s, 0);
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// av_set_pts_info(st, 32, 1, 1000);
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if (!st)
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return AVERROR_NOMEM;
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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) - start;
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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, start, SEEK_SET); // or SEEK_CUR and -size ? :)
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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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int ret, size;
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// FIXME!
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if (c->currentframe > c->totalframes)
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size = 0;
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else
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size = c->seektable[c->currentframe];
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c->currentframe++;
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if (av_new_packet(pkt, size) < 0)
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return AVERROR_IO;
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pkt->pos = url_ftell(&s->pb);
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pkt->stream_index = 0;
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ret = get_buffer(&s->pb, pkt->data, size);
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if (ret <= 0) {
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av_free_packet(pkt);
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return AVERROR_IO;
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}
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pkt->size = ret;
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// av_log(s, AV_LOG_INFO, "TTA packet #%d desired size: %d read size: %d at pos %d\n",
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// c->currentframe, size, ret, pkt->pos);
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return 0; //ret;
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}
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static int tta_read_close(AVFormatContext *s)
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{
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TTAContext *c = s->priv_data;
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if (c->seektable)
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av_free(c->seektable);
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return 0;
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}
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AVInputFormat tta_iformat = {
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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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tta_read_close,
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.extensions = "tta",
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};
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int tta_init(void)
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{
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av_register_input_format(&tta_iformat);
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return 0;
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}
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