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