early-access version 1432

externals/ffmpeg/libavformat/vpk.c

@@ -0,0 +1,143 @@
+/*
+ * VPK demuxer
+ * Copyright (c) 2015 Paul B Mahol
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+
+typedef struct VPKDemuxContext {
+    unsigned data_start;
+    unsigned block_count;
+    unsigned current_block;
+    unsigned last_block_size;
+} VPKDemuxContext;
+
+static int vpk_probe(const AVProbeData *p)
+{
+    if (AV_RL32(p->buf) != MKBETAG('V','P','K',' '))
+        return 0;
+
+    return AVPROBE_SCORE_MAX / 3 * 2;
+}
+
+static int vpk_read_header(AVFormatContext *s)
+{
+    VPKDemuxContext *vpk = s->priv_data;
+    unsigned offset;
+    unsigned samples_per_block;
+    AVStream *st;
+
+    vpk->current_block = 0;
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    avio_skip(s->pb, 4);
+    st->duration           = avio_rl32(s->pb) * 28 / 16;
+    offset                 = avio_rl32(s->pb);
+    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codecpar->codec_id    = AV_CODEC_ID_ADPCM_PSX;
+    st->codecpar->block_align = avio_rl32(s->pb);
+    st->codecpar->sample_rate = avio_rl32(s->pb);
+    if (st->codecpar->sample_rate <= 0 || st->codecpar->block_align <= 0)
+        return AVERROR_INVALIDDATA;
+    st->codecpar->channels    = avio_rl32(s->pb);
+    if (st->codecpar->channels <= 0)
+        return AVERROR_INVALIDDATA;
+    samples_per_block      = ((st->codecpar->block_align / st->codecpar->channels) * 28LL) / 16;
+    if (samples_per_block <= 0)
+        return AVERROR_INVALIDDATA;
+    vpk->block_count       = (st->duration + (samples_per_block - 1)) / samples_per_block;
+    vpk->last_block_size   = (st->duration % samples_per_block) * 16 * st->codecpar->channels / 28;
+
+    if (offset < avio_tell(s->pb))
+        return AVERROR_INVALIDDATA;
+    avio_skip(s->pb, offset - avio_tell(s->pb));
+    vpk->data_start = offset;
+    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
+
+    return 0;
+}
+
+static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVCodecParameters *par = s->streams[0]->codecpar;
+    VPKDemuxContext *vpk = s->priv_data;
+    int ret, i;
+
+    vpk->current_block++;
+    if (vpk->current_block == vpk->block_count) {
+        unsigned size = vpk->last_block_size / par->channels;
+        unsigned skip = (par->block_align - vpk->last_block_size) / par->channels;
+        uint64_t pos = avio_tell(s->pb);
+
+        ret = av_new_packet(pkt, vpk->last_block_size);
+        if (ret < 0)
+            return ret;
+        for (i = 0; i < par->channels; i++) {
+            ret = avio_read(s->pb, pkt->data + i * size, size);
+            avio_skip(s->pb, skip);
+            if (ret != size) {
+                return AVERROR(EIO);
+            }
+        }
+        pkt->pos = pos;
+        pkt->stream_index = 0;
+    } else if (vpk->current_block < vpk->block_count) {
+        ret = av_get_packet(s->pb, pkt, par->block_align);
+        pkt->stream_index = 0;
+    } else {
+        return AVERROR_EOF;
+    }
+
+    return ret;
+}
+
+static int vpk_read_seek(AVFormatContext *s, int stream_index,
+                         int64_t timestamp, int flags)
+{
+    AVStream *st = s->streams[stream_index];
+    AVCodecParameters *par = st->codecpar;
+    VPKDemuxContext *vpk = s->priv_data;
+    int samples_per_block;
+    int64_t ret = 0;
+
+    samples_per_block = av_get_audio_frame_duration2(par, par->block_align);
+    timestamp /= samples_per_block;
+    ret = avio_seek(s->pb, vpk->data_start + timestamp * par->block_align, SEEK_SET);
+    if (ret < 0)
+        return ret;
+
+    vpk->current_block = timestamp;
+    ff_update_cur_dts(s, st, timestamp * samples_per_block);
+    return 0;
+}
+
+AVInputFormat ff_vpk_demuxer = {
+    .name           = "vpk",
+    .long_name      = NULL_IF_CONFIG_SMALL("Sony PS2 VPK"),
+    .priv_data_size = sizeof(VPKDemuxContext),
+    .read_probe     = vpk_probe,
+    .read_header    = vpk_read_header,
+    .read_packet    = vpk_read_packet,
+    .read_seek      = vpk_read_seek,
+    .extensions     = "vpk",
+};