+++ /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