From 616e899c43aae243241369100d2b31c87aafe711 Mon Sep 17 00:00:00 2001 From: Vitor Sessak Date: Sat, 7 Mar 2009 22:42:09 +0000 Subject: VQF demuxer Originally committed as revision 17866 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/vqf.c | 256 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 256 insertions(+) create mode 100644 libavformat/vqf.c (limited to 'libavformat/vqf.c') diff --git a/libavformat/vqf.c b/libavformat/vqf.c new file mode 100644 index 0000000000..d2b48dda04 --- /dev/null +++ b/libavformat/vqf.c @@ -0,0 +1,256 @@ +/* + * 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) +{ + char buf[2048]; + int len = FFMIN3(tag_len, remaining, sizeof(buf) - 1); + + if (len != tag_len) + av_log(s, AV_LOG_ERROR, "Warning: truncating metadata!\n"); + + get_buffer(s->pb, buf, len); + buf[len] = 0; + av_metadata_set(&s->metadata, tag, buf); +} + +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 = get_be32(s->pb); + + st->codec->codec_type = CODEC_TYPE_AUDIO; + st->codec->codec_id = CODEC_ID_TWINVQ; + st->start_time = 0; + + do { + int len; + chunk_tag = get_le32(s->pb); + + if (chunk_tag == MKTAG('D','A','T','A')) + break; + + len = get_be32(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 = get_be32(s->pb) + 1; + read_bitrate = get_be32(s->pb); + rate_flag = get_be32(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; + + 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 = get_buffer(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 = url_fseek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0) + return ret; + + c->remaining_bits = -7 - ((pos-7)&7); + return 0; +} + +AVInputFormat 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", +}; -- cgit v1.2.3