diff options
Diffstat (limited to 'ffmpeg1/libavformat/idroqdec.c')
| -rw-r--r-- | ffmpeg1/libavformat/idroqdec.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/ffmpeg1/libavformat/idroqdec.c b/ffmpeg1/libavformat/idroqdec.c new file mode 100644 index 0000000..6f843d7 --- /dev/null +++ b/ffmpeg1/libavformat/idroqdec.c @@ -0,0 +1,237 @@ +/* + * 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 (url_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->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = AV_CODEC_ID_ROQ; + st->codec->codec_tag = 0; /* no fourcc */ + + if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE) + return AVERROR(EIO); + st->codec->width = roq->width = AV_RL16(preamble); + st->codec->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: + /* 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->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_id = AV_CODEC_ID_ROQ_DPCM; + st->codec->codec_tag = 0; /* no tag */ + if (chunk_type == RoQ_SOUND_STEREO) { + st->codec->channels = 2; + st->codec->channel_layout = AV_CH_LAYOUT_STEREO; + } else { + st->codec->channels = 1; + st->codec->channel_layout = AV_CH_LAYOUT_MONO; + } + roq->audio_channels = st->codec->channels; + st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE; + st->codec->bits_per_coded_sample = 16; + st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * + st->codec->bits_per_coded_sample; + st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; + } + case RoQ_QUAD_VQ: + /* 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, +}; |