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269 lines
7.8 KiB
269 lines
7.8 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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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(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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return AVPROBE_SCORE_MAX/2; |
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} |
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static void add_metadata(AVFormatContext *s, const char *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; |
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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_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL); |
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} |
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static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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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; |
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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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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = 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) { |
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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->codec->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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st->codec->bit_rate = read_bitrate*1000; |
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break; |
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case MKTAG('N','A','M','E'): |
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add_metadata(s, "title" , len, header_size); |
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break; |
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case MKTAG('(','c',')',' '): |
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add_metadata(s, "copyright", len, header_size); |
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break; |
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case MKTAG('A','U','T','H'): |
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add_metadata(s, "author" , len, header_size); |
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break; |
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case MKTAG('A','L','B','M'): |
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add_metadata(s, "album" , len, header_size); |
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break; |
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case MKTAG('T','R','C','K'): |
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add_metadata(s, "track" , len, header_size); |
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break; |
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case MKTAG('C','O','M','T'): |
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add_metadata(s, "comment" , len, header_size); |
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break; |
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case MKTAG('F','I','L','E'): |
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add_metadata(s, "filename" , len, header_size); |
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break; |
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case MKTAG('D','S','I','Z'): |
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add_metadata(s, "size" , len, header_size); |
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break; |
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case MKTAG('D','A','T','E'): |
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add_metadata(s, "date" , len, header_size); |
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break; |
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case MKTAG('G','E','N','R'): |
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add_metadata(s, "genre" , len, header_size); |
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break; |
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default: |
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av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n", |
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((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1], |
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((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]); |
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avio_skip(s->pb, FFMIN(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); |
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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->codec->sample_rate = 44100; |
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break; |
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case 22: |
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st->codec->sample_rate = 22050; |
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break; |
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case 11: |
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st->codec->sample_rate = 11025; |
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break; |
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default: |
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st->codec->sample_rate = rate_flag*1000; |
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break; |
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} |
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switch (((st->codec->sample_rate/1000) << 8) + |
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read_bitrate/st->codec->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 suported: %d Hz, %d kb/s.\n", |
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st->codec->sample_rate, st->codec->bit_rate); |
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return -1; |
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} |
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c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate; |
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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/* put first 12 bytes of COMM chunk in extradata */ |
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if (!(st->codec->extradata = av_malloc(12 + FF_INPUT_BUFFER_PADDING_SIZE))) |
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return AVERROR(ENOMEM); |
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st->codec->extradata_size = 12; |
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memcpy(st->codec->extradata, comm_chunk, 12); |
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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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pkt->pos = avio_tell(s->pb); |
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pkt->stream_index = 0; |
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if (av_new_packet(pkt, size+2) < 0) |
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return AVERROR(EIO); |
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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<=0) { |
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av_free_packet(pkt); |
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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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int 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->codec->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->codec->bit_rate * (int64_t)st->time_base.num); |
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if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->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", |
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};
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