diff options
Diffstat (limited to 'ffmpeg/libavformat/tta.c')
| -rw-r--r-- | ffmpeg/libavformat/tta.c | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/ffmpeg/libavformat/tta.c b/ffmpeg/libavformat/tta.c deleted file mode 100644 index 7174fd5..0000000 --- a/ffmpeg/libavformat/tta.c +++ /dev/null @@ -1,189 +0,0 @@ -/* - * 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 "apetag.h" -#include "avformat.h" -#include "avio_internal.h" -#include "internal.h" -#include "id3v1.h" -#include "libavutil/crc.h" -#include "libavutil/dict.h" - -typedef struct { - int totalframes, currentframe; - int frame_size; - int last_frame_size; -} TTAContext; - -static unsigned long tta_check_crc(unsigned long checksum, const uint8_t *buf, - unsigned int len) -{ - return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len); -} - -static int tta_probe(AVProbeData *p) -{ - if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') && - (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) && - AV_RL16(&p->buf[6]) > 0 && - AV_RL16(&p->buf[8]) > 0 && - AV_RL32(&p->buf[10]) > 0) - return AVPROBE_SCORE_EXTENSION + 30; - return 0; -} - -static int tta_read_header(AVFormatContext *s) -{ - TTAContext *c = s->priv_data; - AVStream *st; - int i, channels, bps, samplerate; - uint64_t framepos, start_offset; - uint32_t nb_samples, crc; - - ff_id3v1_read(s); - - start_offset = avio_tell(s->pb); - ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX); - if (avio_rl32(s->pb) != AV_RL32("TTA1")) - return AVERROR_INVALIDDATA; - - 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 AVERROR_INVALIDDATA; - } - - nb_samples = avio_rl32(s->pb); - if (!nb_samples) { - av_log(s, AV_LOG_ERROR, "invalid number of samples\n"); - return AVERROR_INVALIDDATA; - } - - crc = ffio_get_checksum(s->pb) ^ UINT32_MAX; - if (crc != avio_rl32(s->pb)) { - av_log(s, AV_LOG_ERROR, "Header CRC error\n"); - return AVERROR_INVALIDDATA; - } - - c->frame_size = samplerate * 256 / 245; - c->last_frame_size = nb_samples % c->frame_size; - if (!c->last_frame_size) - c->last_frame_size = c->frame_size; - c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size); - c->currentframe = 0; - - if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){ - av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes); - return AVERROR_INVALIDDATA; - } - - st = avformat_new_stream(s, NULL); - if (!st) - return AVERROR(ENOMEM); - - avpriv_set_pts_info(st, 64, 1, samplerate); - st->start_time = 0; - st->duration = nb_samples; - - framepos = avio_tell(s->pb) + 4*c->totalframes + 4; - - if (ff_alloc_extradata(st->codec, avio_tell(s->pb) - start_offset)) - return AVERROR(ENOMEM); - - avio_seek(s->pb, start_offset, SEEK_SET); - avio_read(s->pb, st->codec->extradata, st->codec->extradata_size); - - ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX); - for (i = 0; i < c->totalframes; i++) { - uint32_t size = avio_rl32(s->pb); - av_add_index_entry(st, framepos, i * c->frame_size, size, 0, - AVINDEX_KEYFRAME); - framepos += size; - } - crc = ffio_get_checksum(s->pb) ^ UINT32_MAX; - if (crc != avio_rl32(s->pb)) { - av_log(s, AV_LOG_ERROR, "Seek table CRC error\n"); - return AVERROR_INVALIDDATA; - } - - st->codec->codec_type = AVMEDIA_TYPE_AUDIO; - st->codec->codec_id = AV_CODEC_ID_TTA; - st->codec->channels = channels; - st->codec->sample_rate = samplerate; - st->codec->bits_per_coded_sample = bps; - - if (s->pb->seekable) { - int64_t pos = avio_tell(s->pb); - ff_ape_parse_tag(s); - avio_seek(s->pb, pos, SEEK_SET); - } - - 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 AVERROR_EOF; - - size = st->index_entries[c->currentframe].size; - - ret = av_get_packet(s->pb, pkt, size); - pkt->dts = st->index_entries[c->currentframe++].timestamp; - pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size : - c->frame_size; - 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; - if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0) - return -1; - - c->currentframe = index; - - return 0; -} - -AVInputFormat ff_tta_demuxer = { - .name = "tta", - .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"), - .priv_data_size = sizeof(TTAContext), - .read_probe = tta_probe, - .read_header = tta_read_header, - .read_packet = tta_read_packet, - .read_seek = tta_read_seek, - .extensions = "tta", -}; |