initial commit for Id RoQ and Interplay MVE multimedia subsystems

Originally committed as revision 2195 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 299 insertions, 0 deletions

diff --git a/libavformat/idroq.c b/libavformat/idroq.c
new file mode 100644
index 0000000000..15c6d55131
--- /dev/null
+++ b/libavformat/idroq.c
@@ -0,0 +1,299 @@
+/*
+ * Id RoQ (.roq) File Demuxer
+ * Copyright (c) 2003 The ffmpeg Project
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/**
+ * @file idroq.c
+ * Id RoQ format file demuxer
+ * by Mike Melanson (melanson@pcisys.net)
+ * for more information on the .roq file format, visit:
+ *   http://www.csse.monash.edu.au/~timf/
+ */
+
+#include "avformat.h"
+
+#define LE_16(x)  ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
+#define LE_32(x)  ((((uint8_t*)(x))[3] << 24) | \
+                   (((uint8_t*)(x))[2] << 16) | \
+                   (((uint8_t*)(x))[1] << 8) | \
+                    ((uint8_t*)(x))[0])
+
+#define RoQ_MAGIC_NUMBER 0x1084
+#define RoQ_CHUNK_PREAMBLE_SIZE 8
+#define RoQ_AUDIO_SAMPLE_RATE 22050
+#define RoQ_CHUNKS_TO_SCAN 30
+
+#define RoQ_INFO           0x1001
+#define RoQ_QUAD_CODEBOOK  0x1002
+#define RoQ_QUAD_VQ        0x1011
+#define RoQ_SOUND_MONO     0x1020
+#define RoQ_SOUND_STEREO   0x1021
+
+typedef struct RoqDemuxContext {
+
+    int width;
+    int height;
+    int audio_channels;
+    int framerate;
+    int frame_pts_inc;
+
+    int video_stream_index;
+    int audio_stream_index;
+
+    int64_t video_pts;
+    unsigned int audio_frame_count;
+
+} RoqDemuxContext;
+
+static int roq_probe(AVProbeData *p)
+{
+    if ((LE_16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
+        (LE_32(&p->buf[2]) != 0xFFFFFFFF))
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int roq_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    RoqDemuxContext *roq = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    AVStream *st;
+    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
+    int i;
+    unsigned int chunk_size;
+    unsigned int chunk_type;
+
+    /* get the main header */
+    if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != 
+        RoQ_CHUNK_PREAMBLE_SIZE)
+        return AVERROR_IO;
+    roq->framerate = LE_16(&preamble[6]);
+    roq->frame_pts_inc = 90000 / roq->framerate;
+
+    /* set the pts reference (1 pts = 1/90000) */
+    s->pts_num = 1;
+    s->pts_den = 90000;
+
+    /* init private context parameters */
+    roq->width = roq->height = roq->audio_channels = roq->video_pts = 
+    roq->audio_frame_count = 0;
+
+    /* scan the first n chunks searching for A/V parameters */
+    for (i = 0; i < RoQ_CHUNKS_TO_SCAN; i++) {
+        if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != 
+            RoQ_CHUNK_PREAMBLE_SIZE)
+            return AVERROR_IO;
+
+        chunk_type = LE_16(&preamble[0]);
+        chunk_size = LE_32(&preamble[2]);
+
+        switch (chunk_type) {
+
+        case RoQ_INFO:
+            /* fetch the width and height; reuse the preamble bytes */
+            if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != 
+                RoQ_CHUNK_PREAMBLE_SIZE)
+                return AVERROR_IO;
+            roq->width = LE_16(&preamble[0]);
+            roq->height = LE_16(&preamble[2]);
+            break;
+
+        case RoQ_QUAD_CODEBOOK:
+        case RoQ_QUAD_VQ:
+            /* ignore during this scan */
+            url_fseek(pb, chunk_size, SEEK_CUR);
+            break;
+
+        case RoQ_SOUND_MONO:
+            roq->audio_channels = 1;
+            url_fseek(pb, chunk_size, SEEK_CUR);
+            break;
+
+        case RoQ_SOUND_STEREO:
+            roq->audio_channels = 2;
+            url_fseek(pb, chunk_size, SEEK_CUR);
+            break;
+
+        default:
+            printf (" unknown RoQ chunk type (%04X)\n", LE_16(&preamble[0]));
+            return AVERROR_INVALIDDATA;
+            break;
+        }
+
+        /* if all necessary parameters have been gathered, exit early */
+        if ((roq->width && roq->height) && roq->audio_channels)
+            break;
+    }
+
+    /* seek back to the first chunk */
+    url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_SET);
+
+    /* initialize the decoders */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+    roq->video_stream_index = st->index;
+    st->codec.codec_type = CODEC_TYPE_VIDEO;
+    st->codec.codec_id = CODEC_ID_ROQ;
+    st->codec.codec_tag = 0;  /* no fourcc */
+    st->codec.width = roq->width;
+    st->codec.height = roq->height;
+
+    if (roq->audio_channels) {
+        st = av_new_stream(s, 0);
+        if (!st)
+            return AVERROR_NOMEM;
+        roq->audio_stream_index = st->index;
+        st->codec.codec_type = CODEC_TYPE_AUDIO;
+        st->codec.codec_id = CODEC_ID_ROQ_DPCM;
+        st->codec.codec_tag = 0;  /* no tag */
+        st->codec.channels = roq->audio_channels;
+        st->codec.sample_rate = RoQ_AUDIO_SAMPLE_RATE;
+        st->codec.bits_per_sample = 16;
+        st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
+            st->codec.bits_per_sample;
+        st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
+    }
+printf (" video is %d x %d, audio is %d channels\n",
+  roq->width, roq->height, roq->audio_channels);
+
+    return 0;
+}
+
+static int roq_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    RoqDemuxContext *roq = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int ret = 0;
+    unsigned int chunk_size;
+    unsigned int chunk_type;
+    unsigned int codebook_size;
+    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
+    int packet_read = 0;
+    offset_t codebook_offset;
+
+    while (!packet_read) {
+
+        if (url_feof(&s->pb))
+            return -EIO;
+
+        /* get the next chunk preamble */
+        if ((ret = get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) != 
+            RoQ_CHUNK_PREAMBLE_SIZE)
+            return -EIO;
+
+        chunk_type = LE_16(&preamble[0]);
+        chunk_size = LE_32(&preamble[2]);
+
+        switch (chunk_type) {
+
+        case RoQ_INFO:
+            /* don't care about this chunk anymore */
+            url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_CUR);
+            break;
+
+        case RoQ_QUAD_CODEBOOK:
+            /* packet needs to contain both this codebook and next VQ chunk */
+            codebook_offset = url_ftell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
+            codebook_size = chunk_size;
+            url_fseek(pb, codebook_size, SEEK_CUR);
+            if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != 
+                RoQ_CHUNK_PREAMBLE_SIZE)
+                return -EIO;
+            chunk_size = LE_32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 + 
+                codebook_size;
+
+            /* rewind */
+            url_fseek(pb, codebook_offset, SEEK_SET);
+
+            /* load up the packet */
+            if (av_new_packet(pkt, chunk_size))
+                return -EIO;
+            pkt->stream_index = roq->video_stream_index;
+            pkt->pts = roq->video_pts;
+            ret = get_buffer(pb, pkt->data, chunk_size);
+            if (ret != chunk_size)
+                ret = -EIO;
+
+            roq->video_pts += roq->frame_pts_inc;
+            packet_read = 1;
+            break;
+
+        case RoQ_SOUND_MONO:
+        case RoQ_SOUND_STEREO:
+        case RoQ_QUAD_VQ:
+            /* load up the packet */
+            if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
+                return -EIO;
+            /* copy over preamble */
+            memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
+
+            if (chunk_type == RoQ_QUAD_VQ) {
+                pkt->stream_index = roq->video_stream_index;
+                pkt->pts = roq->video_pts;
+                roq->video_pts += roq->frame_pts_inc;
+            } else {
+                pkt->stream_index = roq->audio_stream_index;
+                pkt->pts = roq->audio_frame_count;
+                pkt->pts *= 90000;
+                pkt->pts /= RoQ_AUDIO_SAMPLE_RATE;
+                roq->audio_frame_count += (chunk_size / roq->audio_channels);
+            }
+
+            ret = get_buffer(pb, pkt->data, chunk_size);
+            if (ret != chunk_size)
+                ret = -EIO;
+
+            packet_read = 1;
+            break;
+
+        default:
+            printf ("  unknown RoQ chunk (%04X)\n", chunk_type);
+            return AVERROR_INVALIDDATA;
+            break;
+        }
+    }
+
+    return ret;
+}
+
+static int roq_read_close(AVFormatContext *s)
+{
+//    RoqDemuxContext *roq = (RoqDemuxContext *)s->priv_data;
+
+    return 0;
+}
+
+static AVInputFormat roq_iformat = {
+    "RoQ",
+    "Id RoQ format",
+    sizeof(RoqDemuxContext),
+    roq_probe,
+    roq_read_header,
+    roq_read_packet,
+    roq_read_close,
+};
+
+int roq_init(void)
+{
+    av_register_input_format(&roq_iformat);
+    return 0;
+}