| /* |
| * THP Demuxer |
| * Copyright (c) 2007 Marco Gerards |
| * |
| * 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 |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| |
| typedef struct ThpDemuxContext { |
| int version; |
| int first_frame; |
| int first_framesz; |
| int last_frame; |
| int compoff; |
| int framecnt; |
| AVRational fps; |
| int frame; |
| int next_frame; |
| int next_framesz; |
| int video_stream_index; |
| int audio_stream_index; |
| int compcount; |
| unsigned char components[16]; |
| AVStream* vst; |
| int has_audio; |
| int audiosize; |
| } ThpDemuxContext; |
| |
| |
| static int thp_probe(AVProbeData *p) |
| { |
| /* check file header */ |
| if (AV_RL32(p->buf) == MKTAG('T', 'H', 'P', '\0')) |
| return AVPROBE_SCORE_MAX; |
| else |
| return 0; |
| } |
| |
| static int thp_read_header(AVFormatContext *s, |
| AVFormatParameters *ap) |
| { |
| ThpDemuxContext *thp = s->priv_data; |
| AVStream *st; |
| AVIOContext *pb = s->pb; |
| int i; |
| |
| /* Read the file header. */ |
| avio_rb32(pb); /* Skip Magic. */ |
| thp->version = avio_rb32(pb); |
| |
| avio_rb32(pb); /* Max buf size. */ |
| avio_rb32(pb); /* Max samples. */ |
| |
| thp->fps = av_d2q(av_int2flt(avio_rb32(pb)), INT_MAX); |
| thp->framecnt = avio_rb32(pb); |
| thp->first_framesz = avio_rb32(pb); |
| avio_rb32(pb); /* Data size. */ |
| |
| thp->compoff = avio_rb32(pb); |
| avio_rb32(pb); /* offsetDataOffset. */ |
| thp->first_frame = avio_rb32(pb); |
| thp->last_frame = avio_rb32(pb); |
| |
| thp->next_framesz = thp->first_framesz; |
| thp->next_frame = thp->first_frame; |
| |
| /* Read the component structure. */ |
| avio_seek (pb, thp->compoff, SEEK_SET); |
| thp->compcount = avio_rb32(pb); |
| |
| /* Read the list of component types. */ |
| avio_read(pb, thp->components, 16); |
| |
| for (i = 0; i < thp->compcount; i++) { |
| if (thp->components[i] == 0) { |
| if (thp->vst != 0) |
| break; |
| |
| /* Video component. */ |
| st = av_new_stream(s, 0); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| /* The denominator and numerator are switched because 1/fps |
| is required. */ |
| av_set_pts_info(st, 64, thp->fps.den, thp->fps.num); |
| st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codec->codec_id = CODEC_ID_THP; |
| st->codec->codec_tag = 0; /* no fourcc */ |
| st->codec->width = avio_rb32(pb); |
| st->codec->height = avio_rb32(pb); |
| st->codec->sample_rate = av_q2d(thp->fps); |
| thp->vst = st; |
| thp->video_stream_index = st->index; |
| |
| if (thp->version == 0x11000) |
| avio_rb32(pb); /* Unknown. */ |
| } else if (thp->components[i] == 1) { |
| if (thp->has_audio != 0) |
| break; |
| |
| /* Audio component. */ |
| st = av_new_stream(s, 0); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = CODEC_ID_ADPCM_THP; |
| st->codec->codec_tag = 0; /* no fourcc */ |
| st->codec->channels = avio_rb32(pb); /* numChannels. */ |
| st->codec->sample_rate = avio_rb32(pb); /* Frequency. */ |
| |
| av_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| |
| thp->audio_stream_index = st->index; |
| thp->has_audio = 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int thp_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| ThpDemuxContext *thp = s->priv_data; |
| AVIOContext *pb = s->pb; |
| int size; |
| int ret; |
| |
| if (thp->audiosize == 0) { |
| /* Terminate when last frame is reached. */ |
| if (thp->frame >= thp->framecnt) |
| return AVERROR(EIO); |
| |
| avio_seek(pb, thp->next_frame, SEEK_SET); |
| |
| /* Locate the next frame and read out its size. */ |
| thp->next_frame += thp->next_framesz; |
| thp->next_framesz = avio_rb32(pb); |
| |
| avio_rb32(pb); /* Previous total size. */ |
| size = avio_rb32(pb); /* Total size of this frame. */ |
| |
| /* Store the audiosize so the next time this function is called, |
| the audio can be read. */ |
| if (thp->has_audio) |
| thp->audiosize = avio_rb32(pb); /* Audio size. */ |
| else |
| thp->frame++; |
| |
| ret = av_get_packet(pb, pkt, size); |
| if (ret != size) { |
| av_free_packet(pkt); |
| return AVERROR(EIO); |
| } |
| |
| pkt->stream_index = thp->video_stream_index; |
| } else { |
| ret = av_get_packet(pb, pkt, thp->audiosize); |
| if (ret != thp->audiosize) { |
| av_free_packet(pkt); |
| return AVERROR(EIO); |
| } |
| |
| pkt->stream_index = thp->audio_stream_index; |
| thp->audiosize = 0; |
| thp->frame++; |
| } |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_thp_demuxer = { |
| "thp", |
| NULL_IF_CONFIG_SMALL("THP"), |
| sizeof(ThpDemuxContext), |
| thp_probe, |
| thp_read_header, |
| thp_read_packet |
| }; |