/* * id RoQ (.roq) File Demuxer * Copyright (c) 2003 The FFmpeg project * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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/channel_layout.h" #include "libavutil/intreadwrite.h" #include "avformat.h" #include "internal.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 frame_rate; 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) { RoqDemuxContext *roq = s->priv_data; AVIOContext *pb = s->pb; unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE]; /* get the main header */ if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE) return AVERROR(EIO); roq->frame_rate = 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; roq->video_stream_index = -1; s->ctx_flags |= AVFMTCTX_NOHEADER; return 0; } static int roq_read_packet(AVFormatContext *s, AVPacket *pkt) { RoqDemuxContext *roq = s->priv_data; AVIOContext *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 (s->pb->eof_reached) return AVERROR(EIO); /* get the next chunk preamble */ if ((ret = avio_read(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->video_stream_index == -1) { AVStream *st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 63, 1, roq->frame_rate); roq->video_stream_index = st->index; st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_ROQ; st->codecpar->codec_tag = 0; /* no fourcc */ if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE) return AVERROR(EIO); st->codecpar->width = roq->width = AV_RL16(preamble); st->codecpar->height = roq->height = AV_RL16(preamble + 2); break; } /* don't care about this chunk anymore */ avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE); break; case RoQ_QUAD_CODEBOOK: if (roq->video_stream_index < 0) return AVERROR_INVALIDDATA; /* packet needs to contain both this codebook and next VQ chunk */ codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE; codebook_size = chunk_size; avio_skip(pb, codebook_size); if (avio_read(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 */ avio_seek(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 = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE); roq->audio_stream_index = st->index; st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_ROQ_DPCM; st->codecpar->codec_tag = 0; /* no tag */ if (chunk_type == RoQ_SOUND_STEREO) { st->codecpar->channels = 2; st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; } else { st->codecpar->channels = 1; st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; } roq->audio_channels = st->codecpar->channels; st->codecpar->sample_rate = RoQ_AUDIO_SAMPLE_RATE; st->codecpar->bits_per_coded_sample = 16; st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample; st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample; } case RoQ_QUAD_VQ: if (chunk_type == RoQ_QUAD_VQ) { if (roq->video_stream_index < 0) return AVERROR_INVALIDDATA; } /* 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= avio_tell(pb); ret = avio_read(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; } } return ret; } AVInputFormat ff_roq_demuxer = { .name = "roq", .long_name = NULL_IF_CONFIG_SMALL("id RoQ"), .priv_data_size = sizeof(RoqDemuxContext), .read_probe = roq_probe, .read_header = roq_read_header, .read_packet = roq_read_packet, };