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248 lines
8.2 KiB
248 lines
8.2 KiB
/* |
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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 file is part of FFmpeg. |
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* |
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* FFmpeg 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 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg 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 FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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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 "libavutil/channel_layout.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "demux.h" |
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#include "internal.h" |
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#include "avio_internal.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 frame_rate; |
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int width; |
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int height; |
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int audio_channels; |
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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(const AVProbeData *p) |
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{ |
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if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) || |
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(AV_RL32(&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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{ |
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RoqDemuxContext *roq = s->priv_data; |
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AVIOContext *pb = s->pb; |
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unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE]; |
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/* get the main header */ |
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if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != |
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RoQ_CHUNK_PREAMBLE_SIZE) |
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return AVERROR(EIO); |
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roq->frame_rate = AV_RL16(&preamble[6]); |
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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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roq->audio_stream_index = -1; |
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roq->video_stream_index = -1; |
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s->ctx_flags |= AVFMTCTX_NOHEADER; |
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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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AVIOContext *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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int64_t codebook_offset; |
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while (!packet_read) { |
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if (avio_feof(s->pb)) |
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return AVERROR_EOF; |
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/* get the next chunk preamble */ |
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if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) != |
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RoQ_CHUNK_PREAMBLE_SIZE) |
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return AVERROR(EIO); |
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chunk_type = AV_RL16(&preamble[0]); |
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chunk_size = AV_RL32(&preamble[2]); |
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if(chunk_size > INT_MAX) |
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return AVERROR_INVALIDDATA; |
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chunk_size = ffio_limit(pb, chunk_size); |
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switch (chunk_type) { |
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case RoQ_INFO: |
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if (roq->video_stream_index == -1) { |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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avpriv_set_pts_info(st, 63, 1, roq->frame_rate); |
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roq->video_stream_index = st->index; |
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codecpar->codec_id = AV_CODEC_ID_ROQ; |
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st->codecpar->codec_tag = 0; /* no fourcc */ |
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if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE) |
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return AVERROR(EIO); |
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st->codecpar->width = roq->width = AV_RL16(preamble); |
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st->codecpar->height = roq->height = AV_RL16(preamble + 2); |
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break; |
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} |
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/* don't care about this chunk anymore */ |
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avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE); |
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break; |
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case RoQ_QUAD_CODEBOOK: |
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if (roq->video_stream_index < 0) |
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return AVERROR_INVALIDDATA; |
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/* packet needs to contain both this codebook and next VQ chunk */ |
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codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE; |
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codebook_size = chunk_size; |
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avio_skip(pb, codebook_size); |
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if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != |
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RoQ_CHUNK_PREAMBLE_SIZE) |
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return AVERROR(EIO); |
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chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 + |
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codebook_size; |
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if (chunk_size > INT_MAX) |
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return AVERROR_INVALIDDATA; |
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/* rewind */ |
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avio_seek(pb, codebook_offset, SEEK_SET); |
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/* load up the packet */ |
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ret= av_get_packet(pb, pkt, chunk_size); |
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if (ret != chunk_size) |
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return AVERROR(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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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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if (roq->audio_stream_index == -1) { |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE); |
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roq->audio_stream_index = st->index; |
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codecpar->codec_id = AV_CODEC_ID_ROQ_DPCM; |
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st->codecpar->codec_tag = 0; /* no tag */ |
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if (chunk_type == RoQ_SOUND_STEREO) { |
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st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; |
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} else { |
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st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; |
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} |
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roq->audio_channels = st->codecpar->ch_layout.nb_channels; |
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st->codecpar->sample_rate = RoQ_AUDIO_SAMPLE_RATE; |
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st->codecpar->bits_per_coded_sample = 16; |
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st->codecpar->bit_rate = roq->audio_channels * st->codecpar->sample_rate * |
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st->codecpar->bits_per_coded_sample; |
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st->codecpar->block_align = roq->audio_channels * st->codecpar->bits_per_coded_sample; |
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} |
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case RoQ_QUAD_VQ: |
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if (chunk_type == RoQ_QUAD_VQ) { |
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if (roq->video_stream_index < 0) |
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return AVERROR_INVALIDDATA; |
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} |
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/* load up the packet */ |
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ret = av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE); |
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if (ret < 0) |
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return ret; |
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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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} 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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roq->audio_frame_count += (chunk_size / roq->audio_channels); |
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} |
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pkt->pos= avio_tell(pb); |
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ret = avio_read(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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return AVERROR(EIO); |
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} |
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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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} |
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} |
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return ret; |
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} |
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const FFInputFormat ff_roq_demuxer = { |
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.p.name = "roq", |
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.p.long_name = NULL_IF_CONFIG_SMALL("id RoQ"), |
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.priv_data_size = sizeof(RoqDemuxContext), |
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.read_probe = roq_probe, |
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.read_header = roq_read_header, |
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.read_packet = roq_read_packet, |
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};
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