VQF demuxer

Originally committed as revision 17866 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 256 insertions, 0 deletions

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",
+};