Add PlayStation Portable PMP format demuxer

Not yet complete, for demuxing AAC the AAC header must be generated
manually.
Possibly the decoder could accept the header as extradata to simplify
this.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 179 insertions, 0 deletions

diff --git a/libavformat/pmpdec.c b/libavformat/pmpdec.c
new file mode 100644
index 0000000000..a367344b16
--- /dev/null
+++ b/libavformat/pmpdec.c
@@ -0,0 +1,179 @@
+/*
+ * PMP demuxer
+ * Copyright (c) 2011 Reimar Döffinger
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; 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"
+
+typedef struct PMPContext {
+    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 (!memcmp(p->buf, "pmpm\1\0\0\0", 8))
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+static int pmp_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    PMPContext *pmp = s->priv_data;
+    AVIOContext *pb = s->pb;
+    int tb_num, tb_den;
+    int index_cnt;
+    int audio_codec_id = CODEC_ID_NONE;
+    int srate, channels;
+    int i;
+    uint64_t pos;
+    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 = CODEC_ID_MPEG4;
+        break;
+    case 1:
+        vst->codec->codec_id = 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);
+    av_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 = CODEC_ID_MP3;
+        break;
+    case 1:
+        av_log(s, AV_LOG_WARNING, "AAC is not yet correctly supported\n");
+        audio_codec_id = 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;
+    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;
+        av_set_pts_info(ast, 32, 1, srate);
+    }
+    pos = avio_tell(pb) + 4 * index_cnt;
+    for (i = 0; i < index_cnt; i++) {
+        int size  = avio_rl32(pb);
+        int flags = size & 1 ? AVINDEX_KEYFRAME : 0;
+        size >>= 1;
+        av_add_index_entry(vst, pos, i, size, 0, flags);
+        pos += size;
+    }
+    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 (pb->eof_reached)
+        return AVERROR_EOF;
+    if (pmp->cur_stream == 0) {
+        int num_packets;
+        pmp->audio_packets = avio_r8(pb);
+        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;
+    }
+    pmp->current_packet++;
+    if (pmp->current_packet == 1 || pmp->current_packet > pmp->audio_packets)
+        pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams;
+
+    return ret;
+}
+
+static int pmp_seek(AVFormatContext *s, int stream_idx, 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 format"),
+    .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,
+};