making act segmenter

1 files changed, 197 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/pmpdec.c b/ffmpeg/libavformat/pmpdec.c
new file mode 100644
index 0000000..2fe6c46
--- /dev/null
+++ b/ffmpeg/libavformat/pmpdec.c
@@ -0,0 +1,197 @@
+/*
+ * PMP demuxer.
+ * Copyright (c) 2011 Reimar Döffinger
+ *
+ * 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 {
+    int cur_stream;
+    int num_streams;
+    int audio_packets;
+    int current_packet;
+    uint32_t *packet_sizes;
+    int packet_sizes_alloc;
+} PMPContext;
+
+static int pmp_probe(AVProbeData *p) {
+    if (AV_RN32(p->buf) == AV_RN32("pmpm") &&
+        AV_RL32(p->buf + 4) == 1)
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+static int pmp_header(AVFormatContext *s)
+{
+    PMPContext *pmp = s->priv_data;
+    AVIOContext *pb = s->pb;
+    int tb_num, tb_den;
+    uint32_t index_cnt;
+    int audio_codec_id = AV_CODEC_ID_NONE;
+    int srate, channels;
+    unsigned i;
+    uint64_t pos;
+    int64_t fsize = avio_size(pb);
+
+    AVStream *vst = avformat_new_stream(s, NULL);
+    if (!vst)
+        return AVERROR(ENOMEM);
+    vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    avio_skip(pb, 8);
+    switch (avio_rl32(pb)) {
+    case 0:
+        vst->codec->codec_id = AV_CODEC_ID_MPEG4;
+        break;
+    case 1:
+        vst->codec->codec_id = AV_CODEC_ID_H264;
+        break;
+    default:
+        av_log(s, AV_LOG_ERROR, "Unsupported video format\n");
+        break;
+    }
+    index_cnt = avio_rl32(pb);
+    vst->codec->width  = avio_rl32(pb);
+    vst->codec->height = avio_rl32(pb);
+
+    tb_num = avio_rl32(pb);
+    tb_den = avio_rl32(pb);
+    avpriv_set_pts_info(vst, 32, tb_num, tb_den);
+    vst->nb_frames = index_cnt;
+    vst->duration = index_cnt;
+
+    switch (avio_rl32(pb)) {
+    case 0:
+        audio_codec_id = AV_CODEC_ID_MP3;
+        break;
+    case 1:
+        av_log(s, AV_LOG_ERROR, "AAC not yet correctly supported\n");
+        audio_codec_id = AV_CODEC_ID_AAC;
+        break;
+    default:
+        av_log(s, AV_LOG_ERROR, "Unsupported audio format\n");
+        break;
+    }
+    pmp->num_streams = avio_rl16(pb) + 1;
+    avio_skip(pb, 10);
+    srate = avio_rl32(pb);
+    channels = avio_rl32(pb) + 1;
+    pos = avio_tell(pb) + 4LL*index_cnt;
+    for (i = 0; i < index_cnt; i++) {
+        uint32_t size = avio_rl32(pb);
+        int flags = size & 1 ? AVINDEX_KEYFRAME : 0;
+        if (url_feof(pb)) {
+            av_log(s, AV_LOG_FATAL, "Encountered EOF while reading index.\n");
+            return AVERROR_INVALIDDATA;
+        }
+        size >>= 1;
+        if (size < 9 + 4*pmp->num_streams) {
+            av_log(s, AV_LOG_ERROR, "Packet too small\n");
+            return AVERROR_INVALIDDATA;
+        }
+        av_add_index_entry(vst, pos, i, size, 0, flags);
+        pos += size;
+        if (fsize > 0 && i == 0 && pos > fsize) {
+            av_log(s, AV_LOG_ERROR, "File ends before first packet\n");
+            return AVERROR_INVALIDDATA;
+        }
+    }
+    for (i = 1; i < pmp->num_streams; i++) {
+        AVStream *ast = avformat_new_stream(s, NULL);
+        if (!ast)
+            return AVERROR(ENOMEM);
+        ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+        ast->codec->codec_id = audio_codec_id;
+        ast->codec->channels = channels;
+        ast->codec->sample_rate = srate;
+        avpriv_set_pts_info(ast, 32, 1, srate);
+    }
+    return 0;
+}
+
+static int pmp_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    PMPContext *pmp = s->priv_data;
+    AVIOContext *pb = s->pb;
+    int ret = 0;
+    int i;
+
+    if (url_feof(pb))
+        return AVERROR_EOF;
+    if (pmp->cur_stream == 0) {
+        int num_packets;
+        pmp->audio_packets = avio_r8(pb);
+        if (!pmp->audio_packets) {
+            avpriv_request_sample(s, "0 audio packets");
+            return AVERROR_PATCHWELCOME;
+        }
+        num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1;
+        avio_skip(pb, 8);
+        pmp->current_packet = 0;
+        av_fast_malloc(&pmp->packet_sizes,
+                       &pmp->packet_sizes_alloc,
+                       num_packets * sizeof(*pmp->packet_sizes));
+        if (!pmp->packet_sizes_alloc) {
+            av_log(s, AV_LOG_ERROR, "Cannot (re)allocate packet buffer\n");
+            return AVERROR(ENOMEM);
+        }
+        for (i = 0; i < num_packets; i++)
+            pmp->packet_sizes[i] = avio_rl32(pb);
+    }
+    ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]);
+    if (ret >= 0) {
+        ret = 0;
+        // FIXME: this is a hack that should be removed once
+        // compute_pkt_fields() can handle timestamps properly
+        if (pmp->cur_stream == 0)
+            pkt->dts = s->streams[0]->cur_dts++;
+        pkt->stream_index = pmp->cur_stream;
+    }
+    if (pmp->current_packet % pmp->audio_packets == 0)
+        pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams;
+    pmp->current_packet++;
+    return ret;
+}
+
+static int pmp_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
+{
+    PMPContext *pmp = s->priv_data;
+    pmp->cur_stream = 0;
+    // fallback to default seek now
+    return -1;
+}
+
+static int pmp_close(AVFormatContext *s)
+{
+    PMPContext *pmp = s->priv_data;
+    av_freep(&pmp->packet_sizes);
+    return 0;
+}
+
+AVInputFormat ff_pmp_demuxer = {
+    .name           = "pmp",
+    .long_name      = NULL_IF_CONFIG_SMALL("Playstation Portable PMP"),
+    .priv_data_size = sizeof(PMPContext),
+    .read_probe     = pmp_probe,
+    .read_header    = pmp_header,
+    .read_packet    = pmp_packet,
+    .read_seek      = pmp_seek,
+    .read_close     = pmp_close,
+};