| /* |
| * 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 "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(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(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; |
| |
| 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->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) { |
| av_packet_unref(pkt); |
| 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, |
| }; |
