rename idroq.c to idroqdec.c

Originally committed as revision 24969 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 226 insertions, 0 deletions

diff --git a/libavformat/idroqdec.c b/libavformat/idroqdec.c
new file mode 100644
index 0000000000..6b036d9c07
--- /dev/null
+++ b/libavformat/idroqdec.c
@@ -0,0 +1,226 @@
+/*
+ * id RoQ (.roq) File Demuxer
+ * Copyright (c) 2003 The ffmpeg Project
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * 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 "libavutil/intreadwrite.h"
+#include "avformat.h"
+
+#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 video_stream_index;
+    int audio_stream_index;
+
+    int64_t video_pts;
+    unsigned int audio_frame_count;
+
+} RoqDemuxContext;
+
+static int roq_probe(AVProbeData *p)
+{
+    if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
+        (AV_RL32(&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;
+    int framerate;
+    AVStream *st;
+    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
+
+    /* get the main header */
+    if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
+        RoQ_CHUNK_PREAMBLE_SIZE)
+        return AVERROR(EIO);
+    framerate = AV_RL16(&preamble[6]);
+
+    /* init private context parameters */
+    roq->width = roq->height = roq->audio_channels = roq->video_pts =
+    roq->audio_frame_count = 0;
+    roq->audio_stream_index = -1;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+    av_set_pts_info(st, 63, 1, framerate);
+    roq->video_stream_index = st->index;
+    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id = CODEC_ID_ROQ;
+    st->codec->codec_tag = 0;  /* no fourcc */
+
+    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;
+    int64_t codebook_offset;
+
+    while (!packet_read) {
+
+        if (url_feof(s->pb))
+            return AVERROR(EIO);
+
+        /* get the next chunk preamble */
+        if ((ret = get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
+            RoQ_CHUNK_PREAMBLE_SIZE)
+            return AVERROR(EIO);
+
+        chunk_type = AV_RL16(&preamble[0]);
+        chunk_size = AV_RL32(&preamble[2]);
+        if(chunk_size > INT_MAX)
+            return AVERROR_INVALIDDATA;
+
+        switch (chunk_type) {
+
+        case RoQ_INFO:
+            if (!roq->width || !roq->height) {
+                AVStream *st = s->streams[roq->video_stream_index];
+                if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
+                    return AVERROR(EIO);
+                st->codec->width  = roq->width  = AV_RL16(preamble);
+                st->codec->height = roq->height = AV_RL16(preamble + 2);
+                break;
+            }
+            /* 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 AVERROR(EIO);
+            chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
+                codebook_size;
+
+            /* rewind */
+            url_fseek(pb, codebook_offset, SEEK_SET);
+
+            /* load up the packet */
+            ret= av_get_packet(pb, pkt, chunk_size);
+            if (ret != chunk_size)
+                return AVERROR(EIO);
+            pkt->stream_index = roq->video_stream_index;
+            pkt->pts = roq->video_pts++;
+
+            packet_read = 1;
+            break;
+
+        case RoQ_SOUND_MONO:
+        case RoQ_SOUND_STEREO:
+            if (roq->audio_stream_index == -1) {
+                AVStream *st = av_new_stream(s, 1);
+                if (!st)
+                    return AVERROR(ENOMEM);
+                av_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
+                roq->audio_stream_index = st->index;
+                st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+                st->codec->codec_id = CODEC_ID_ROQ_DPCM;
+                st->codec->codec_tag = 0;  /* no tag */
+                st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
+                st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
+                st->codec->bits_per_coded_sample = 16;
+                st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
+                    st->codec->bits_per_coded_sample;
+                st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
+            }
+        case RoQ_QUAD_VQ:
+            /* load up the packet */
+            if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
+                return AVERROR(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++;
+            } else {
+                pkt->stream_index = roq->audio_stream_index;
+                pkt->pts = roq->audio_frame_count;
+                roq->audio_frame_count += (chunk_size / roq->audio_channels);
+            }
+
+            pkt->pos= url_ftell(pb);
+            ret = get_buffer(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
+                chunk_size);
+            if (ret != chunk_size)
+                ret = AVERROR(EIO);
+
+            packet_read = 1;
+            break;
+
+        default:
+            av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
+            return AVERROR_INVALIDDATA;
+            break;
+        }
+    }
+
+    return ret;
+}
+
+AVInputFormat roq_demuxer = {
+    "RoQ",
+    NULL_IF_CONFIG_SMALL("id RoQ format"),
+    sizeof(RoqDemuxContext),
+    roq_probe,
+    roq_read_header,
+    roq_read_packet,
+};