/* * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA */#include "libavcodec/bitstream.h"#include "avformat.h"typedef struct {    int totalframes, currentframe;} TTAContext;static int tta_probe(AVProbeData *p){    const uint8_t *d = p->buf;    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;    uint64_t framepos;    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 = samplerate*256/245;    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;    }    st = av_new_stream(s, 0);    if (!st)        return AVERROR(ENOMEM);    av_set_pts_info(st, 64, 1, samplerate);    st->start_time = 0;    st->duration = datalen;    framepos = url_ftell(s->pb) + 4*c->totalframes + 4;    for (i = 0; i < c->totalframes; i++) {        uint32_t size = get_le32(s->pb);        av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME);        framepos += size;    }    url_fskip(s->pb, 4); // seektable crc    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);    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, 0, SEEK_SET);    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;    AVStream *st = s->streams[0];    int size, ret;    // FIXME!    if (c->currentframe > c->totalframes)        return -1;    size = st->index_entries[c->currentframe].size;    ret = av_get_packet(s->pb, pkt, size);    pkt->dts = st->index_entries[c->currentframe++].timestamp;    return ret;}static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags){    TTAContext *c = s->priv_data;    AVStream *st = s->streams[stream_index];    int index = av_index_search_timestamp(st, timestamp, flags);    if (index < 0)        return -1;    c->currentframe = index;    url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);    return 0;}AVInputFormat tta_demuxer = {    "tta",    NULL_IF_CONFIG_SMALL("True Audio"),    sizeof(TTAContext),    tta_probe,    tta_read_header,    tta_read_packet,    NULL,    tta_read_seek,    .extensions = "tta",};