[FFmpeg-devel] [PATCH 2/3] RSD demuxer

James Almer jamrial at gmail.com
Mon Apr 22 21:40:42 CEST 2013


Signed-off-by: James Almer <jamrial at gmail.com>
---
 Changelog                |   1 +
 doc/general.texi         |   1 +
 libavformat/Makefile     |   1 +
 libavformat/allformats.c |   1 +
 libavformat/rsd.c        | 193 +++++++++++++++++++++++++++++++++++++++++++++++
 libavformat/version.h    |   2 +-
 6 files changed, 198 insertions(+), 1 deletion(-)
 create mode 100644 libavformat/rsd.c

diff --git a/Changelog b/Changelog
index 7481a7c..912110d 100644
--- a/Changelog
+++ b/Changelog
@@ -30,6 +30,7 @@ version <next>:
 - decent native animated GIF encoding
 - asetrate filter
 - interleave filter
+- RSD demuxer
 
 
 version 1.2:
diff --git a/doc/general.texi b/doc/general.texi
index b6e731a..8b98d51 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -353,6 +353,7 @@ library:
     @tab Audio and video format used in some games by Entertainment Software Partners.
 @item RPL/ARMovie               @tab   @tab X
 @item Lego Mindstorms RSO       @tab X @tab X
+ at item RSD                       @tab   @tab X
 @item RTMP                      @tab X @tab X
     @tab Output is performed by publishing stream to RTMP server
 @item RTP                       @tab X @tab X
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 470e7f3..dbc0e41 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -309,6 +309,7 @@ OBJS-$(CONFIG_RM_DEMUXER)                += rmdec.o rm.o rmsipr.o
 OBJS-$(CONFIG_RM_MUXER)                  += rmenc.o rm.o
 OBJS-$(CONFIG_ROQ_DEMUXER)               += idroqdec.o
 OBJS-$(CONFIG_ROQ_MUXER)                 += idroqenc.o rawenc.o
+OBJS-$(CONFIG_RSD_DEMUXER)               += rsd.o
 OBJS-$(CONFIG_RSO_DEMUXER)               += rsodec.o rso.o pcm.o
 OBJS-$(CONFIG_RSO_MUXER)                 += rsoenc.o rso.o
 OBJS-$(CONFIG_RPL_DEMUXER)               += rpl.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 80c53f6..e18351b 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -234,6 +234,7 @@ void av_register_all(void)
     REGISTER_MUXDEMUX(RM,               rm);
     REGISTER_MUXDEMUX(ROQ,              roq);
     REGISTER_DEMUXER (RPL,              rpl);
+    REGISTER_DEMUXER (RSD,              rsd);
     REGISTER_MUXDEMUX(RSO,              rso);
     REGISTER_MUXDEMUX(RTP,              rtp);
     REGISTER_MUXDEMUX(RTSP,             rtsp);
diff --git a/libavformat/rsd.c b/libavformat/rsd.c
new file mode 100644
index 0000000..41ab654
--- /dev/null
+++ b/libavformat/rsd.c
@@ -0,0 +1,193 @@
+/*
+ * RSD demuxer
+ * Copyright (c) 2013 James Almer
+ *
+ * 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 "libavcodec/bytestream.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "avio.h"
+#include "internal.h"
+
+typedef struct RSDDemuxContext {
+    uint8_t     *table;
+} RSDDemuxContext;
+
+static const AVCodecTag rsd_tags[] = {
+    { AV_CODEC_ID_ADPCM_THP,       MKTAG('G','A','D','P') },
+    { AV_CODEC_ID_PCM_S16BE,       MKTAG('P','C','M','B') },
+    { AV_CODEC_ID_PCM_S16LE,       MKTAG('P','C','M',' ') },
+    { AV_CODEC_ID_NONE, 0 },
+};
+
+static const uint32_t rsd_unsupported_tags[] = {
+    MKTAG('O','G','G',' '),
+    MKTAG('R','A','D','P'),
+    MKTAG('V','A','G',' '),
+    MKTAG('W','A','D','P'),
+    MKTAG('X','A','D','P'),
+    MKTAG('X','M','A',' '),
+};
+
+static int rsd_probe(AVProbeData *p)
+{
+    if (!memcmp(p->buf, "RSD", 3) &&
+        p->buf[3] - '0' >= 2 && p->buf[3] - '0' <= 6)
+        return AVPROBE_SCORE_MAX / 2;
+    return 0;
+}
+
+static int rsd_close(AVFormatContext *s)
+{
+    RSDDemuxContext *rsd = s->priv_data;
+
+    av_freep(&rsd->table);
+
+    return 0;
+}
+
+static int rsd_read_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    RSDDemuxContext *rsd = s->priv_data;
+    int version, start = 0x800;
+    AVCodecContext *codec;
+    AVStream *st = avformat_new_stream(s, NULL);
+
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    avio_skip(pb, 3); // "RSD"
+    version = avio_r8(pb) - '0';
+
+    codec = st->codec;
+    codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    codec->codec_tag  = avio_rl32(pb);
+    codec->codec_id   = ff_codec_get_id(rsd_tags, codec->codec_tag);
+    if (!codec->codec_id) {
+        char tag_buf[5];
+        int i;
+
+        av_get_codec_tag_string(tag_buf, sizeof(tag_buf), codec->codec_tag);
+        for (i=0; i < FF_ARRAY_ELEMS(rsd_unsupported_tags); i++) {
+            if (codec->codec_tag == rsd_unsupported_tags[i]) {
+                avpriv_request_sample(s, "Codec tag: %s", tag_buf);
+                return AVERROR_PATCHWELCOME;
+            }
+        }
+        av_log(s, AV_LOG_ERROR, "Unknown codec tag: %s\n", tag_buf);
+        return AVERROR_INVALIDDATA;
+    }
+
+    codec->channels = avio_rl32(pb);
+    if (!codec->channels)
+        return AVERROR_INVALIDDATA;
+
+    avio_skip(pb, 4); // Bit depth
+    codec->sample_rate = avio_rl32(pb);
+    if (!codec->sample_rate)
+        return AVERROR_INVALIDDATA;
+
+    avio_skip(pb, 4); // Unknown
+
+    switch (codec->codec_id) {
+    case AV_CODEC_ID_ADPCM_THP:
+    {
+        /* RSD3GADP is mono, so only alloc enough memory
+           to store the coeff table for a single channel. */
+
+        rsd->table = av_malloc(32);
+        if (!rsd->table)
+            return AVERROR(ENOMEM);
+
+        start = avio_rl32(pb);
+
+        if (avio_read(s->pb, rsd->table, 32) != 32) {
+            rsd_close(s);
+            return AVERROR_INVALIDDATA;
+        }
+        if (pb->seekable)
+            st->duration = (avio_size(pb) - start) / 8 * 14;
+        break;
+    }
+    case AV_CODEC_ID_PCM_S16LE:
+    case AV_CODEC_ID_PCM_S16BE:
+        if (version != 4)
+            start = avio_rl32(pb);
+
+        if (pb->seekable)
+            st->duration = (avio_size(pb) - start) / 2 / codec->channels;
+        break;
+    }
+
+    avio_skip(pb, start - avio_tell(pb));
+
+    avpriv_set_pts_info(st, 64, 1, codec->sample_rate);
+
+    return 0;
+}
+
+static int rsd_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVCodecContext *codec = s->streams[0]->codec;
+    RSDDemuxContext *rsd  = s->priv_data;
+    int i, ret, size = 1024;
+
+    if (url_feof(s->pb))
+        return AVERROR_EOF;
+
+    if (codec->codec_id == AV_CODEC_ID_ADPCM_THP) {
+        uint8_t *dst;
+
+        if ((ret = av_new_packet(pkt, size)) < 0)
+            return ret;
+        if (!av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, 32))
+            return AVERROR(ENOMEM);
+        dst = pkt->side_data[0].data;
+        for (i = 0; i < 16; i++)
+            bytestream_put_be16(&dst, AV_RL16(rsd->table + i * 2));
+
+        ret = avio_read(s->pb, pkt->data, size);
+    } else {
+        ret = av_get_packet(s->pb, pkt, size);
+    }
+
+    if (ret != size) {
+        if (ret < 0) {
+            av_free_packet(pkt);
+            return ret;
+        }
+        av_shrink_packet(pkt, ret);
+    }
+    pkt->stream_index = 0;
+
+    return ret;
+}
+
+AVInputFormat ff_rsd_demuxer = {
+    .name           =   "rsd",
+    .long_name      =   NULL_IF_CONFIG_SMALL("GameCube RSD"),
+    .priv_data_size =   sizeof(RSDDemuxContext),
+    .read_probe     =   rsd_probe,
+    .read_header    =   rsd_read_header,
+    .read_packet    =   rsd_read_packet,
+    .read_close     =   rsd_close,
+    .extensions     =   "rsd",
+    .codec_tag      =   (const AVCodecTag* const []){rsd_tags, 0},
+};
diff --git a/libavformat/version.h b/libavformat/version.h
index 8fd08cf..3e186a9 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -30,7 +30,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 55
-#define LIBAVFORMAT_VERSION_MINOR  3
+#define LIBAVFORMAT_VERSION_MINOR  4
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
-- 
1.8.1.msysgit.1




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