297 lines
8.5 KiB
C
297 lines
8.5 KiB
C
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/*
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* VQF demuxer
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* Copyright (c) 2009 Vitor Sessak
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/dict.h"
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#include "libavutil/mathematics.h"
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#include "riff.h"
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typedef struct VqfContext {
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int frame_bit_len;
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uint8_t last_frame_bits;
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int remaining_bits;
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} VqfContext;
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static int vqf_probe(const AVProbeData *probe_packet)
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{
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if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
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return 0;
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if (!memcmp(probe_packet->buf + 4, "97012000", 8))
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return AVPROBE_SCORE_MAX;
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if (!memcmp(probe_packet->buf + 4, "00052200", 8))
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return AVPROBE_SCORE_MAX;
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if (AV_RL32(probe_packet->buf + 12) > (1<<27))
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return AVPROBE_SCORE_EXTENSION/2;
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return AVPROBE_SCORE_EXTENSION;
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}
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static void add_metadata(AVFormatContext *s, uint32_t tag,
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unsigned int tag_len, unsigned int remaining)
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{
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int len = FFMIN(tag_len, remaining);
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char *buf, key[5] = {0};
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if (len == UINT_MAX)
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return;
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buf = av_malloc(len+1);
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if (!buf)
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return;
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avio_read(s->pb, buf, len);
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buf[len] = 0;
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AV_WL32(key, tag);
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av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL);
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}
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static const AVMetadataConv vqf_metadata_conv[] = {
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{ "(c) ", "copyright" },
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{ "ARNG", "arranger" },
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{ "AUTH", "author" },
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{ "BAND", "band" },
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{ "CDCT", "conductor" },
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{ "COMT", "comment" },
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{ "FILE", "filename" },
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{ "GENR", "genre" },
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{ "LABL", "publisher" },
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{ "MUSC", "composer" },
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{ "NAME", "title" },
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{ "NOTE", "note" },
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{ "PROD", "producer" },
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{ "PRSN", "personnel" },
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{ "REMX", "remixer" },
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{ "SING", "singer" },
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{ "TRCK", "track" },
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{ "WORD", "words" },
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{ 0 },
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};
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static int vqf_read_header(AVFormatContext *s)
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{
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VqfContext *c = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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int chunk_tag;
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int rate_flag = -1;
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int header_size;
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int read_bitrate = 0;
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int size, ret;
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uint8_t comm_chunk[12];
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if (!st)
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return AVERROR(ENOMEM);
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avio_skip(s->pb, 12);
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header_size = avio_rb32(s->pb);
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if (header_size < 0)
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return AVERROR_INVALIDDATA;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_TWINVQ;
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st->start_time = 0;
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do {
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int len;
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chunk_tag = avio_rl32(s->pb);
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if (chunk_tag == MKTAG('D','A','T','A'))
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break;
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len = avio_rb32(s->pb);
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if ((unsigned) len > INT_MAX/2 || header_size < 8) {
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av_log(s, AV_LOG_ERROR, "Malformed header\n");
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return -1;
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}
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header_size -= 8;
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switch(chunk_tag){
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case MKTAG('C','O','M','M'):
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avio_read(s->pb, comm_chunk, 12);
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st->codecpar->channels = AV_RB32(comm_chunk ) + 1;
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read_bitrate = AV_RB32(comm_chunk + 4);
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rate_flag = AV_RB32(comm_chunk + 8);
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avio_skip(s->pb, len-12);
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if (st->codecpar->channels <= 0) {
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av_log(s, AV_LOG_ERROR, "Invalid number of channels\n");
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return AVERROR_INVALIDDATA;
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}
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st->codecpar->bit_rate = (int64_t)read_bitrate * 1000;
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break;
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case MKTAG('D','S','I','Z'): // size of compressed data
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{
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av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0);
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}
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break;
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case MKTAG('Y','E','A','R'): // recording date
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case MKTAG('E','N','C','D'): // compression date
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case MKTAG('E','X','T','R'): // reserved
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case MKTAG('_','Y','M','H'): // reserved
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case MKTAG('_','N','T','T'): // reserved
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case MKTAG('_','I','D','3'): // reserved for ID3 tags
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avio_skip(s->pb, FFMIN(len, header_size));
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break;
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default:
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add_metadata(s, chunk_tag, len, header_size);
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break;
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}
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header_size -= len;
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} while (header_size >= 0 && !avio_feof(s->pb));
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switch (rate_flag) {
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case -1:
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av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
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return -1;
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case 44:
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st->codecpar->sample_rate = 44100;
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break;
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case 22:
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st->codecpar->sample_rate = 22050;
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break;
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case 11:
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st->codecpar->sample_rate = 11025;
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break;
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default:
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if (rate_flag < 8 || rate_flag > 44) {
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av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag);
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return AVERROR_INVALIDDATA;
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}
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st->codecpar->sample_rate = rate_flag*1000;
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break;
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}
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if (read_bitrate / st->codecpar->channels < 8 ||
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read_bitrate / st->codecpar->channels > 48) {
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av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n",
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read_bitrate / st->codecpar->channels);
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return AVERROR_INVALIDDATA;
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}
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switch (((st->codecpar->sample_rate/1000) << 8) +
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read_bitrate/st->codecpar->channels) {
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case (11<<8) + 8 :
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case (8 <<8) + 8 :
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case (11<<8) + 10:
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case (22<<8) + 32:
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size = 512;
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break;
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case (16<<8) + 16:
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case (22<<8) + 20:
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case (22<<8) + 24:
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size = 1024;
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break;
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case (44<<8) + 40:
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case (44<<8) + 48:
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size = 2048;
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break;
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default:
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av_log(s, AV_LOG_ERROR, "Mode not supported: %d Hz, %"PRId64" kb/s.\n",
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st->codecpar->sample_rate, st->codecpar->bit_rate);
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return -1;
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}
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c->frame_bit_len = st->codecpar->bit_rate*size/st->codecpar->sample_rate;
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avpriv_set_pts_info(st, 64, size, st->codecpar->sample_rate);
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/* put first 12 bytes of COMM chunk in extradata */
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if ((ret = ff_alloc_extradata(st->codecpar, 12)) < 0)
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return ret;
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memcpy(st->codecpar->extradata, comm_chunk, 12);
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ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
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return 0;
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}
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static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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VqfContext *c = s->priv_data;
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int ret;
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int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
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if ((ret = av_new_packet(pkt, size + 2)) < 0)
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return ret;
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pkt->pos = avio_tell(s->pb);
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pkt->stream_index = 0;
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pkt->duration = 1;
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pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
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pkt->data[1] = c->last_frame_bits;
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ret = avio_read(s->pb, pkt->data+2, size);
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if (ret != size) {
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return AVERROR(EIO);
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}
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c->last_frame_bits = pkt->data[size+1];
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c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
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return size+2;
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}
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static int vqf_read_seek(AVFormatContext *s,
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int stream_index, int64_t timestamp, int flags)
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{
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VqfContext *c = s->priv_data;
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AVStream *st;
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int64_t ret;
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int64_t pos;
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st = s->streams[stream_index];
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pos = av_rescale_rnd(timestamp * st->codecpar->bit_rate,
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st->time_base.num,
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st->time_base.den * (int64_t)c->frame_bit_len,
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(flags & AVSEEK_FLAG_BACKWARD) ?
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AV_ROUND_DOWN : AV_ROUND_UP);
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pos *= c->frame_bit_len;
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st->cur_dts = av_rescale(pos, st->time_base.den,
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st->codecpar->bit_rate * (int64_t)st->time_base.num);
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if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->internal->data_offset, SEEK_SET)) < 0)
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return ret;
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c->remaining_bits = -7 - ((pos-7)&7);
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return 0;
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}
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AVInputFormat ff_vqf_demuxer = {
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.name = "vqf",
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.long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
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.priv_data_size = sizeof(VqfContext),
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.read_probe = vqf_probe,
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.read_header = vqf_read_header,
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.read_packet = vqf_read_packet,
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.read_seek = vqf_read_seek,
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.extensions = "vqf,vql,vqe",
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};
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