| /* |
| * 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/get_bits.h" |
| #include "avformat.h" |
| #include "id3v1.h" |
| #include "libavutil/dict.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, start_offset; |
| |
| if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) |
| ff_id3v1_read(s); |
| |
| start_offset = avio_tell(s->pb); |
| if (avio_rl32(s->pb) != AV_RL32("TTA1")) |
| return -1; // not tta file |
| |
| avio_skip(s->pb, 2); // FIXME: flags |
| channels = avio_rl16(s->pb); |
| bps = avio_rl16(s->pb); |
| samplerate = avio_rl32(s->pb); |
| if(samplerate <= 0 || samplerate > 1000000){ |
| av_log(s, AV_LOG_ERROR, "nonsense samplerate\n"); |
| return -1; |
| } |
| |
| datalen = avio_rl32(s->pb); |
| if(datalen < 0){ |
| av_log(s, AV_LOG_ERROR, "nonsense datalen\n"); |
| return -1; |
| } |
| |
| avio_skip(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 = avio_tell(s->pb) + 4*c->totalframes + 4; |
| |
| for (i = 0; i < c->totalframes; i++) { |
| uint32_t size = avio_rl32(s->pb); |
| av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME); |
| framepos += size; |
| } |
| avio_skip(s->pb, 4); // seektable crc |
| |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = CODEC_ID_TTA; |
| st->codec->channels = channels; |
| st->codec->sample_rate = samplerate; |
| st->codec->bits_per_coded_sample = bps; |
| |
| st->codec->extradata_size = avio_tell(s->pb) - start_offset; |
| if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){ |
| //this check is redundant as avio_read 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); |
| if (!st->codec->extradata) { |
| st->codec->extradata_size = 0; |
| return AVERROR(ENOMEM); |
| } |
| avio_seek(s->pb, start_offset, SEEK_SET); |
| avio_read(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; |
| avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET); |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_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", |
| }; |