CDXL demuxer and decoder

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 170 insertions, 0 deletions

diff --git a/libavformat/cdxl.c b/libavformat/cdxl.c
new file mode 100644
index 0000000000..f2956dd2f2
--- /dev/null
+++ b/libavformat/cdxl.c
@@ -0,0 +1,170 @@
+/*
+ * CDXL demuxer
+ * Copyright (c) 2011-2012 Paul B Mahol
+ *
+ * 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 "libavutil/parseutils.h"
+#include "libavutil/opt.h"
+#include "avformat.h"
+#include "internal.h"
+
+#define CDXL_HEADER_SIZE 32
+
+typedef struct CDXLDemuxContext {
+    AVClass     *class;
+    int         sample_rate;
+    char        *framerate;
+    AVRational  fps;
+    int         read_chunk;
+    uint8_t     header[CDXL_HEADER_SIZE];
+    int         video_stream_index;
+    int         audio_stream_index;
+} CDXLDemuxContext;
+
+static int cdxl_read_header(AVFormatContext *s)
+{
+    CDXLDemuxContext *cdxl = s->priv_data;
+    int ret;
+
+    if ((ret = av_parse_video_rate(&cdxl->fps, cdxl->framerate)) < 0) {
+        av_log(s, AV_LOG_ERROR,
+               "Could not parse framerate: %s.\n", cdxl->framerate);
+        return ret;
+    }
+
+    cdxl->read_chunk         =  0;
+    cdxl->video_stream_index = -1;
+    cdxl->audio_stream_index = -1;
+
+    s->ctx_flags |= AVFMTCTX_NOHEADER;
+
+    return 0;
+}
+
+static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    CDXLDemuxContext *cdxl = s->priv_data;
+    AVIOContext *pb = s->pb;
+    uint32_t current_size;
+    uint16_t audio_size, palette_size;
+    int32_t  video_size;
+    int64_t  pos;
+    int      ret;
+
+    if (pb->eof_reached)
+        return AVERROR_EOF;
+
+    pos = avio_tell(pb);
+    if (!cdxl->read_chunk &&
+        avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE)
+        return AVERROR_EOF;
+    if (cdxl->header[0] != 1) {
+        av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    current_size = AV_RB32(&cdxl->header[2]);
+    palette_size = AV_RB16(&cdxl->header[20]);
+    audio_size   = AV_RB16(&cdxl->header[22]);
+
+    if (palette_size > 512)
+        return AVERROR_INVALIDDATA;
+    if (current_size < audio_size + palette_size + CDXL_HEADER_SIZE)
+        return AVERROR_INVALIDDATA;
+    video_size   = current_size - audio_size - CDXL_HEADER_SIZE;
+
+    if (cdxl->read_chunk && audio_size) {
+        if (cdxl->audio_stream_index == -1) {
+            AVStream *st = avformat_new_stream(s, NULL);
+            if (!st)
+                return AVERROR(ENOMEM);
+
+            st->codec->codec_type    = AVMEDIA_TYPE_AUDIO;
+            st->codec->codec_tag     = 0;
+            st->codec->codec_id      = CODEC_ID_PCM_S8;
+            st->codec->channels      = cdxl->header[1] & 0x10 ? 2 : 1;
+            st->codec->sample_rate   = cdxl->sample_rate;
+            cdxl->audio_stream_index = st->index;
+            avpriv_set_pts_info(st, 32, 1, cdxl->sample_rate);
+        }
+
+        ret = av_get_packet(pb, pkt, audio_size);
+        if (ret < 0)
+            return ret;
+        pkt->stream_index = cdxl->audio_stream_index;
+        pkt->pos          = pos;
+        pkt->duration     = audio_size;
+        cdxl->read_chunk  = 0;
+    } else {
+        if (cdxl->video_stream_index == -1) {
+            AVStream *st = avformat_new_stream(s, NULL);
+            if (!st)
+                return AVERROR(ENOMEM);
+
+            st->codec->codec_type    = AVMEDIA_TYPE_VIDEO;
+            st->codec->codec_tag     = 0;
+            st->codec->codec_id      = CODEC_ID_CDXL;
+            st->codec->width         = AV_RB16(&cdxl->header[14]);
+            st->codec->height        = AV_RB16(&cdxl->header[16]);
+            cdxl->video_stream_index = st->index;
+            avpriv_set_pts_info(st, 63, cdxl->fps.den, cdxl->fps.num);
+        }
+
+        if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0)
+            return AVERROR(ENOMEM);
+        memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
+        ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
+        if (ret < 0) {
+            av_free_packet(pkt);
+            return ret;
+        }
+        pkt->stream_index  = cdxl->video_stream_index;
+        pkt->flags        |= AV_PKT_FLAG_KEY;
+        pkt->pos           = pos;
+        cdxl->read_chunk   = audio_size;
+    }
+
+    return ret;
+}
+
+#define OFFSET(x) offsetof(CDXLDemuxContext, x)
+static const AVOption cdxl_options[] = {
+    { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT,    { .dbl = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
+    { "framerate",   "", OFFSET(framerate),   AV_OPT_TYPE_STRING, { .str = "10" },  0, 0,       AV_OPT_FLAG_DECODING_PARAM },
+    { NULL },
+};
+
+static const AVClass cdxl_demuxer_class = {
+    .class_name = "CDXL demuxer",
+    .item_name  = av_default_item_name,
+    .option     = cdxl_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_cdxl_demuxer = {
+    .name           = "cdxl",
+    .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video format"),
+    .priv_data_size = sizeof(CDXLDemuxContext),
+    .read_header    = cdxl_read_header,
+    .read_packet    = cdxl_read_packet,
+    .extensions     = "cdxl,xl",
+    .flags          = AVFMT_GENERIC_INDEX,
+    .priv_class     = &cdxl_demuxer_class,
+};