yading@11: /* yading@11: * TTA demuxer yading@11: * Copyright (c) 2006 Alex Beregszaszi yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: #include "libavcodec/get_bits.h" yading@11: #include "avformat.h" yading@11: #include "internal.h" yading@11: #include "id3v1.h" yading@11: #include "libavutil/dict.h" yading@11: yading@11: typedef struct { yading@11: int totalframes, currentframe; yading@11: int frame_size; yading@11: int last_frame_size; yading@11: } TTAContext; yading@11: yading@11: static int tta_probe(AVProbeData *p) yading@11: { yading@11: const uint8_t *d = p->buf; yading@11: yading@11: if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1') yading@11: return 80; yading@11: return 0; yading@11: } yading@11: yading@11: static int tta_read_header(AVFormatContext *s) yading@11: { yading@11: TTAContext *c = s->priv_data; yading@11: AVStream *st; yading@11: int i, channels, bps, samplerate; yading@11: uint64_t framepos, start_offset; yading@11: uint32_t datalen; yading@11: yading@11: if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) yading@11: ff_id3v1_read(s); yading@11: yading@11: start_offset = avio_tell(s->pb); yading@11: if (avio_rl32(s->pb) != AV_RL32("TTA1")) yading@11: return -1; // not tta file yading@11: yading@11: avio_skip(s->pb, 2); // FIXME: flags yading@11: channels = avio_rl16(s->pb); yading@11: bps = avio_rl16(s->pb); yading@11: samplerate = avio_rl32(s->pb); yading@11: if(samplerate <= 0 || samplerate > 1000000){ yading@11: av_log(s, AV_LOG_ERROR, "nonsense samplerate\n"); yading@11: return -1; yading@11: } yading@11: yading@11: datalen = avio_rl32(s->pb); yading@11: if (!datalen) { yading@11: av_log(s, AV_LOG_ERROR, "invalid datalen\n"); yading@11: return AVERROR_INVALIDDATA; yading@11: } yading@11: yading@11: avio_skip(s->pb, 4); // header crc yading@11: yading@11: c->frame_size = samplerate * 256 / 245; yading@11: c->last_frame_size = datalen % c->frame_size; yading@11: if (!c->last_frame_size) yading@11: c->last_frame_size = c->frame_size; yading@11: c->totalframes = datalen / c->frame_size + (c->last_frame_size < c->frame_size); yading@11: c->currentframe = 0; yading@11: yading@11: if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){ yading@11: av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes); yading@11: return -1; yading@11: } yading@11: yading@11: st = avformat_new_stream(s, NULL); yading@11: if (!st) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: avpriv_set_pts_info(st, 64, 1, samplerate); yading@11: st->start_time = 0; yading@11: st->duration = datalen; yading@11: yading@11: framepos = avio_tell(s->pb) + 4*c->totalframes + 4; yading@11: yading@11: for (i = 0; i < c->totalframes; i++) { yading@11: uint32_t size = avio_rl32(s->pb); yading@11: av_add_index_entry(st, framepos, i * c->frame_size, size, 0, yading@11: AVINDEX_KEYFRAME); yading@11: framepos += size; yading@11: } yading@11: avio_skip(s->pb, 4); // seektable crc yading@11: yading@11: st->codec->codec_type = AVMEDIA_TYPE_AUDIO; yading@11: st->codec->codec_id = AV_CODEC_ID_TTA; yading@11: st->codec->channels = channels; yading@11: st->codec->sample_rate = samplerate; yading@11: st->codec->bits_per_coded_sample = bps; yading@11: yading@11: st->codec->extradata_size = avio_tell(s->pb) - start_offset; yading@11: if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){ yading@11: //this check is redundant as avio_read should fail yading@11: av_log(s, AV_LOG_ERROR, "extradata_size too large\n"); yading@11: return -1; yading@11: } yading@11: st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE); yading@11: if (!st->codec->extradata) { yading@11: st->codec->extradata_size = 0; yading@11: return AVERROR(ENOMEM); yading@11: } yading@11: avio_seek(s->pb, start_offset, SEEK_SET); yading@11: avio_read(s->pb, st->codec->extradata, st->codec->extradata_size); yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int tta_read_packet(AVFormatContext *s, AVPacket *pkt) yading@11: { yading@11: TTAContext *c = s->priv_data; yading@11: AVStream *st = s->streams[0]; yading@11: int size, ret; yading@11: yading@11: // FIXME! yading@11: if (c->currentframe >= c->totalframes) yading@11: return AVERROR_EOF; yading@11: yading@11: size = st->index_entries[c->currentframe].size; yading@11: yading@11: ret = av_get_packet(s->pb, pkt, size); yading@11: pkt->dts = st->index_entries[c->currentframe++].timestamp; yading@11: pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size : yading@11: c->frame_size; yading@11: return ret; yading@11: } yading@11: yading@11: static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) yading@11: { yading@11: TTAContext *c = s->priv_data; yading@11: AVStream *st = s->streams[stream_index]; yading@11: int index = av_index_search_timestamp(st, timestamp, flags); yading@11: if (index < 0) yading@11: return -1; yading@11: if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0) yading@11: return -1; yading@11: yading@11: c->currentframe = index; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: AVInputFormat ff_tta_demuxer = { yading@11: .name = "tta", yading@11: .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"), yading@11: .priv_data_size = sizeof(TTAContext), yading@11: .read_probe = tta_probe, yading@11: .read_header = tta_read_header, yading@11: .read_packet = tta_read_packet, yading@11: .read_seek = tta_read_seek, yading@11: .extensions = "tta", yading@11: };