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Diffstat (limited to 'ffmpeg/libavformat/vqf.c')
-rw-r--r--ffmpeg/libavformat/vqf.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/vqf.c b/ffmpeg/libavformat/vqf.c
new file mode 100644
index 0000000..f1e6aaf
--- /dev/null
+++ b/ffmpeg/libavformat/vqf.c
@@ -0,0 +1,284 @@
+/*
+ * 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 "internal.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/dict.h"
+#include "libavutil/mathematics.h"
+#include "riff.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, uint32_t tag,
+ unsigned int tag_len, unsigned int remaining)
+{
+ int len = FFMIN(tag_len, remaining);
+ char *buf, key[5] = {0};
+
+ if (len == UINT_MAX)
+ return;
+
+ buf = av_malloc(len+1);
+ if (!buf)
+ return;
+ avio_read(s->pb, buf, len);
+ buf[len] = 0;
+ AV_WL32(key, tag);
+ av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL);
+}
+
+static const AVMetadataConv vqf_metadata_conv[] = {
+ { "(c) ", "copyright" },
+ { "ARNG", "arranger" },
+ { "AUTH", "author" },
+ { "BAND", "band" },
+ { "CDCT", "conductor" },
+ { "COMT", "comment" },
+ { "FILE", "filename" },
+ { "GENR", "genre" },
+ { "LABL", "publisher" },
+ { "MUSC", "composer" },
+ { "NAME", "title" },
+ { "NOTE", "note" },
+ { "PROD", "producer" },
+ { "PRSN", "personnel" },
+ { "REMX", "remixer" },
+ { "SING", "singer" },
+ { "TRCK", "track" },
+ { "WORD", "words" },
+ { 0 },
+};
+
+static int vqf_read_header(AVFormatContext *s)
+{
+ VqfContext *c = s->priv_data;
+ AVStream *st = avformat_new_stream(s, NULL);
+ int chunk_tag;
+ int rate_flag = -1;
+ int header_size;
+ int read_bitrate = 0;
+ int size;
+ uint8_t comm_chunk[12];
+
+ 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 = AV_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'):
+ avio_read(s->pb, comm_chunk, 12);
+ st->codec->channels = AV_RB32(comm_chunk ) + 1;
+ read_bitrate = AV_RB32(comm_chunk + 4);
+ rate_flag = AV_RB32(comm_chunk + 8);
+ avio_skip(s->pb, len-12);
+
+ st->codec->bit_rate = read_bitrate*1000;
+ break;
+ case MKTAG('D','S','I','Z'): // size of compressed data
+ {
+ char buf[8] = {0};
+ int size = avio_rb32(s->pb);
+
+ snprintf(buf, sizeof(buf), "%d", size);
+ av_dict_set(&s->metadata, "size", buf, 0);
+ }
+ break;
+ case MKTAG('Y','E','A','R'): // recording date
+ case MKTAG('E','N','C','D'): // compression date
+ case MKTAG('E','X','T','R'): // reserved
+ case MKTAG('_','Y','M','H'): // reserved
+ case MKTAG('_','N','T','T'): // reserved
+ case MKTAG('_','I','D','3'): // reserved for ID3 tags
+ avio_skip(s->pb, FFMIN(len, header_size));
+ break;
+ default:
+ add_metadata(s, chunk_tag, 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;
+ if (st->codec->sample_rate <= 0) {
+ av_log(s, AV_LOG_ERROR, "sample rate %d is invalid\n", st->codec->sample_rate);
+ return -1;
+ }
+ 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;
+ avpriv_set_pts_info(st, 64, size, st->codec->sample_rate);
+
+ /* put first 12 bytes of COMM chunk in extradata */
+ if (!(st->codec->extradata = av_malloc(12 + FF_INPUT_BUFFER_PADDING_SIZE)))
+ return AVERROR(ENOMEM);
+ st->codec->extradata_size = 12;
+ memcpy(st->codec->extradata, comm_chunk, 12);
+
+ ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
+
+ 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;
+
+ if (av_new_packet(pkt, size+2) < 0)
+ return AVERROR(EIO);
+
+ pkt->pos = avio_tell(s->pb);
+ pkt->stream_index = 0;
+ pkt->duration = 1;
+
+ 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 = {
+ .name = "vqf",
+ .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
+ .priv_data_size = sizeof(VqfContext),
+ .read_probe = vqf_probe,
+ .read_header = vqf_read_header,
+ .read_packet = vqf_read_packet,
+ .read_seek = vqf_read_seek,
+ .extensions = "vqf,vql,vqe",
+};
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