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authorAurelien Jacobs <aurel@gnuage.org>2010-08-29 16:37:33 +0000
committerAurelien Jacobs <aurel@gnuage.org>2010-08-29 16:37:33 +0000
commit2aa751d2c867e0bf1ffd3725818ef2bbca03ce58 (patch)
treef6bfc0069beb8ef39feda0ad1b90b866a554bd39 /libavformat/idroqdec.c
parent54a73bb57f27ea5572f021cfa3bd045797703fe3 (diff)
downloadffmpeg-2aa751d2c867e0bf1ffd3725818ef2bbca03ce58.tar.gz
rename idroq.c to idroqdec.c
Originally committed as revision 24969 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/idroqdec.c')
-rw-r--r--libavformat/idroqdec.c226
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,
+};