| /* | |
| * 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/channel_layout.h" | |
| #include "libavutil/intreadwrite.h" | |
| #include "avformat.h" | |
| #include "demux.h" | |
| #include "internal.h" | |
| #include "avio_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(const 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 (avio_feof(s->pb)) | |
| return AVERROR_EOF; | |
| /* 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; | |
| chunk_size = ffio_limit(pb, chunk_size); | |
| 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; | |
| if (chunk_size > INT_MAX) | |
| return AVERROR_INVALIDDATA; | |
| /* 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->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; | |
| } else { | |
| st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
| } | |
| roq->audio_channels = st->codecpar->ch_layout.nb_channels; | |
| st->codecpar->sample_rate = RoQ_AUDIO_SAMPLE_RATE; | |
| st->codecpar->bits_per_coded_sample = 16; | |
| st->codecpar->bit_rate = roq->audio_channels * st->codecpar->sample_rate * | |
| st->codecpar->bits_per_coded_sample; | |
| st->codecpar->block_align = roq->audio_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 */ | |
| ret = av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE); | |
| if (ret < 0) | |
| return ret; | |
| /* 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) { | |
| return 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; | |
| } | |
| const FFInputFormat ff_roq_demuxer = { | |
| .p.name = "roq", | |
| .p.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, | |
| }; |