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296 lines
8.6 KiB
C
296 lines
8.6 KiB
C
/*
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* Id RoQ (.roq) File Demuxer
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* Copyright (c) 2003 The ffmpeg Project
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file idroq.c
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* Id RoQ format file demuxer
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* by Mike Melanson (melanson@pcisys.net)
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* for more information on the .roq file format, visit:
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* http://www.csse.monash.edu.au/~timf/
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*/
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#include "avformat.h"
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#define RoQ_MAGIC_NUMBER 0x1084
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#define RoQ_CHUNK_PREAMBLE_SIZE 8
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#define RoQ_AUDIO_SAMPLE_RATE 22050
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#define RoQ_CHUNKS_TO_SCAN 30
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#define RoQ_INFO 0x1001
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#define RoQ_QUAD_CODEBOOK 0x1002
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#define RoQ_QUAD_VQ 0x1011
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#define RoQ_SOUND_MONO 0x1020
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#define RoQ_SOUND_STEREO 0x1021
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typedef struct RoqDemuxContext {
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int width;
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int height;
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int audio_channels;
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int framerate;
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int frame_pts_inc;
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int video_stream_index;
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int audio_stream_index;
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int64_t video_pts;
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unsigned int audio_frame_count;
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} RoqDemuxContext;
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static int roq_probe(AVProbeData *p)
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{
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if (p->buf_size < 6)
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return 0;
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if ((LE_16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
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(LE_32(&p->buf[2]) != 0xFFFFFFFF))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int roq_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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RoqDemuxContext *roq = s->priv_data;
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ByteIOContext *pb = &s->pb;
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AVStream *st;
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unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
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int i;
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unsigned int chunk_size;
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unsigned int chunk_type;
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/* get the main header */
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if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
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RoQ_CHUNK_PREAMBLE_SIZE)
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return AVERROR_IO;
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roq->framerate = LE_16(&preamble[6]);
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roq->frame_pts_inc = 90000 / roq->framerate;
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/* set the pts reference (1 pts = 1/90000) */
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s->pts_num = 1;
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s->pts_den = 90000;
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/* init private context parameters */
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roq->width = roq->height = roq->audio_channels = roq->video_pts =
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roq->audio_frame_count = 0;
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/* scan the first n chunks searching for A/V parameters */
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for (i = 0; i < RoQ_CHUNKS_TO_SCAN; i++) {
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if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
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RoQ_CHUNK_PREAMBLE_SIZE)
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return AVERROR_IO;
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chunk_type = LE_16(&preamble[0]);
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chunk_size = LE_32(&preamble[2]);
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switch (chunk_type) {
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case RoQ_INFO:
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/* fetch the width and height; reuse the preamble bytes */
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if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
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RoQ_CHUNK_PREAMBLE_SIZE)
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return AVERROR_IO;
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roq->width = LE_16(&preamble[0]);
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roq->height = LE_16(&preamble[2]);
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break;
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case RoQ_QUAD_CODEBOOK:
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case RoQ_QUAD_VQ:
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/* ignore during this scan */
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url_fseek(pb, chunk_size, SEEK_CUR);
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break;
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case RoQ_SOUND_MONO:
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roq->audio_channels = 1;
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url_fseek(pb, chunk_size, SEEK_CUR);
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break;
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case RoQ_SOUND_STEREO:
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roq->audio_channels = 2;
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url_fseek(pb, chunk_size, SEEK_CUR);
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break;
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default:
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av_log(s, AV_LOG_ERROR, " unknown RoQ chunk type (%04X)\n", LE_16(&preamble[0]));
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return AVERROR_INVALIDDATA;
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break;
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}
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/* if all necessary parameters have been gathered, exit early */
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if ((roq->width && roq->height) && roq->audio_channels)
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break;
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}
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/* seek back to the first chunk */
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url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_SET);
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/* initialize the decoders */
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR_NOMEM;
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roq->video_stream_index = st->index;
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st->codec.codec_type = CODEC_TYPE_VIDEO;
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st->codec.codec_id = CODEC_ID_ROQ;
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st->codec.codec_tag = 0; /* no fourcc */
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st->codec.width = roq->width;
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st->codec.height = roq->height;
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if (roq->audio_channels) {
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR_NOMEM;
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roq->audio_stream_index = st->index;
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st->codec.codec_type = CODEC_TYPE_AUDIO;
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st->codec.codec_id = CODEC_ID_ROQ_DPCM;
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st->codec.codec_tag = 0; /* no tag */
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st->codec.channels = roq->audio_channels;
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st->codec.sample_rate = RoQ_AUDIO_SAMPLE_RATE;
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st->codec.bits_per_sample = 16;
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st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
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st->codec.bits_per_sample;
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st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
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}
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return 0;
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}
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static int roq_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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RoqDemuxContext *roq = s->priv_data;
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ByteIOContext *pb = &s->pb;
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int ret = 0;
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unsigned int chunk_size;
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unsigned int chunk_type;
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unsigned int codebook_size;
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unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
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int packet_read = 0;
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offset_t codebook_offset;
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while (!packet_read) {
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if (url_feof(&s->pb))
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return -EIO;
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/* get the next chunk preamble */
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if ((ret = get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
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RoQ_CHUNK_PREAMBLE_SIZE)
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return -EIO;
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chunk_type = LE_16(&preamble[0]);
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chunk_size = LE_32(&preamble[2]);
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switch (chunk_type) {
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case RoQ_INFO:
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/* don't care about this chunk anymore */
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url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_CUR);
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break;
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case RoQ_QUAD_CODEBOOK:
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/* packet needs to contain both this codebook and next VQ chunk */
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codebook_offset = url_ftell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
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codebook_size = chunk_size;
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url_fseek(pb, codebook_size, SEEK_CUR);
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if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
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RoQ_CHUNK_PREAMBLE_SIZE)
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return -EIO;
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chunk_size = LE_32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
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codebook_size;
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/* rewind */
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url_fseek(pb, codebook_offset, SEEK_SET);
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/* load up the packet */
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if (av_new_packet(pkt, chunk_size))
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return -EIO;
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pkt->stream_index = roq->video_stream_index;
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pkt->pts = roq->video_pts;
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ret = get_buffer(pb, pkt->data, chunk_size);
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if (ret != chunk_size)
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ret = -EIO;
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roq->video_pts += roq->frame_pts_inc;
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packet_read = 1;
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break;
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case RoQ_SOUND_MONO:
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case RoQ_SOUND_STEREO:
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case RoQ_QUAD_VQ:
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/* load up the packet */
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if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
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return -EIO;
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/* copy over preamble */
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memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
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if (chunk_type == RoQ_QUAD_VQ) {
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pkt->stream_index = roq->video_stream_index;
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pkt->pts = roq->video_pts;
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roq->video_pts += roq->frame_pts_inc;
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} else {
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pkt->stream_index = roq->audio_stream_index;
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pkt->pts = roq->audio_frame_count;
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pkt->pts *= 90000;
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pkt->pts /= RoQ_AUDIO_SAMPLE_RATE;
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roq->audio_frame_count += (chunk_size / roq->audio_channels);
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}
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ret = get_buffer(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
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chunk_size);
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if (ret != chunk_size)
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ret = -EIO;
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packet_read = 1;
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break;
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default:
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av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type);
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return AVERROR_INVALIDDATA;
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break;
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}
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}
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return ret;
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}
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static int roq_read_close(AVFormatContext *s)
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{
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// RoqDemuxContext *roq = (RoqDemuxContext *)s->priv_data;
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return 0;
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}
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static AVInputFormat roq_iformat = {
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"RoQ",
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"Id RoQ format",
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sizeof(RoqDemuxContext),
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roq_probe,
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roq_read_header,
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roq_read_packet,
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roq_read_close,
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};
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int roq_init(void)
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{
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av_register_input_format(&roq_iformat);
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return 0;
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}
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