| /* |
| * 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" |
| #include "libavutil/dict.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_dict_set(&s->metadata, tag, buf, AV_DICT_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); |
| |
| avio_skip(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); |
| avio_skip(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]); |
| avio_skip(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 = avio_tell(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", |
| }; |