--- /dev/null
+/*
+ * 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 (p->buf_size < 6)
+ return 0;
+
+ 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;
+ }
+
+ 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 + RoQ_CHUNK_PREAMBLE_SIZE,
+ 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;
+}
projects / synfig.git / blobdiff