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