/* * 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 "libavutil/intreadwrite.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; return AVPROBE_SCORE_MAX/2; } static void add_metadata(AVFormatContext *s, const char *tag, unsigned int tag_len, unsigned int remaining) { int len = FFMIN(tag_len, remaining); char *buf; if (len == UINT_MAX) return; buf = av_malloc(len+1); if (!buf) return; avio_read(s->pb, buf, len); buf[len] = 0; av_metadata_set2(&s->metadata, tag, buf, AV_METADATA_DONT_STRDUP_VAL); } static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap) { VqfContext *c = s->priv_data; AVStream *st = av_new_stream(s, 0); int chunk_tag; int rate_flag = -1; int header_size; int read_bitrate = 0; int size; if (!st) return AVERROR(ENOMEM); url_fskip(s->pb, 12); header_size = avio_rb32(s->pb); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = 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'): st->codec->channels = avio_rb32(s->pb) + 1; read_bitrate = avio_rb32(s->pb); rate_flag = avio_rb32(s->pb); url_fskip(s->pb, len-12); st->codec->bit_rate = read_bitrate*1000; st->codec->bits_per_coded_sample = 16; break; case MKTAG('N','A','M','E'): add_metadata(s, "title" , len, header_size); break; case MKTAG('(','c',')',' '): add_metadata(s, "copyright", len, header_size); break; case MKTAG('A','U','T','H'): add_metadata(s, "author" , len, header_size); break; case MKTAG('A','L','B','M'): add_metadata(s, "album" , len, header_size); break; case MKTAG('T','R','C','K'): add_metadata(s, "track" , len, header_size); break; case MKTAG('C','O','M','T'): add_metadata(s, "comment" , len, header_size); break; case MKTAG('F','I','L','E'): add_metadata(s, "filename" , len, header_size); break; case MKTAG('D','S','I','Z'): add_metadata(s, "size" , len, header_size); break; case MKTAG('D','A','T','E'): add_metadata(s, "date" , len, header_size); break; case MKTAG('G','E','N','R'): add_metadata(s, "genre" , len, header_size); break; default: av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n", ((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1], ((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]); url_fskip(s->pb, FFMIN(len, header_size)); break; } header_size -= len; } while (header_size >= 0); 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: st->codec->sample_rate = rate_flag*1000; break; } 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 suported: %d Hz, %d kb/s.\n", st->codec->sample_rate, st->codec->bit_rate); return -1; } c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate; av_set_pts_info(st, 64, 1, st->codec->sample_rate); 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; pkt->pos = url_ftell(s->pb); pkt->stream_index = 0; if (av_new_packet(pkt, size+2) < 0) return AVERROR(EIO); 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<=0) { av_free_packet(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; int 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->data_offset, SEEK_SET)) < 0) return ret; c->remaining_bits = -7 - ((pos-7)&7); return 0; } AVInputFormat ff_vqf_demuxer = { "vqf", NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"), sizeof(VqfContext), vqf_probe, vqf_read_header, vqf_read_packet, NULL, vqf_read_seek, .extensions = "vqf", };