/* * Delphine Software International CIN File Demuxer * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net) * * 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 libavformat/dsicin.c * Delphine Software International CIN file demuxer */ #include "libavutil/intreadwrite.h" #include "avformat.h" typedef struct CinFileHeader { int video_frame_size; int video_frame_width; int video_frame_height; int audio_frequency; int audio_bits; int audio_stereo; int audio_frame_size; } CinFileHeader; typedef struct CinFrameHeader { int audio_frame_type; int video_frame_type; int pal_colors_count; int audio_frame_size; int video_frame_size; } CinFrameHeader; typedef struct CinDemuxContext { int audio_stream_index; int video_stream_index; CinFileHeader file_header; int64_t audio_stream_pts; int64_t video_stream_pts; CinFrameHeader frame_header; int audio_buffer_size; } CinDemuxContext; static int cin_probe(AVProbeData *p) { /* header starts with this special marker */ if (AV_RL32(&p->buf[0]) != 0x55AA0000) return 0; /* for accuracy, check some header field values */ if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0) return 0; return AVPROBE_SCORE_MAX; } static int cin_read_file_header(CinDemuxContext *cin, ByteIOContext *pb) { CinFileHeader *hdr = &cin->file_header; if (get_le32(pb) != 0x55AA0000) return AVERROR_INVALIDDATA; hdr->video_frame_size = get_le32(pb); hdr->video_frame_width = get_le16(pb); hdr->video_frame_height = get_le16(pb); hdr->audio_frequency = get_le32(pb); hdr->audio_bits = get_byte(pb); hdr->audio_stereo = get_byte(pb); hdr->audio_frame_size = get_le16(pb); if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0) return AVERROR_INVALIDDATA; return 0; } static int cin_read_header(AVFormatContext *s, AVFormatParameters *ap) { int rc; CinDemuxContext *cin = s->priv_data; CinFileHeader *hdr = &cin->file_header; ByteIOContext *pb = s->pb; AVStream *st; rc = cin_read_file_header(cin, pb); if (rc) return rc; cin->video_stream_pts = 0; cin->audio_stream_pts = 0; cin->audio_buffer_size = 0; /* initialize the video decoder stream */ st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); av_set_pts_info(st, 32, 1, 12); cin->video_stream_index = st->index; st->codec->codec_type = CODEC_TYPE_VIDEO; st->codec->codec_id = CODEC_ID_DSICINVIDEO; st->codec->codec_tag = 0; /* no fourcc */ st->codec->width = hdr->video_frame_width; st->codec->height = hdr->video_frame_height; /* initialize the audio decoder stream */ st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); av_set_pts_info(st, 32, 1, 22050); cin->audio_stream_index = st->index; st->codec->codec_type = CODEC_TYPE_AUDIO; st->codec->codec_id = CODEC_ID_DSICINAUDIO; st->codec->codec_tag = 0; /* no tag */ st->codec->channels = 1; st->codec->sample_rate = 22050; st->codec->bits_per_coded_sample = 16; st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels; st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; return 0; } static int cin_read_frame_header(CinDemuxContext *cin, ByteIOContext *pb) { CinFrameHeader *hdr = &cin->frame_header; hdr->video_frame_type = get_byte(pb); hdr->audio_frame_type = get_byte(pb); hdr->pal_colors_count = get_le16(pb); hdr->video_frame_size = get_le32(pb); hdr->audio_frame_size = get_le32(pb); if (url_feof(pb) || url_ferror(pb)) return AVERROR(EIO); if (get_le32(pb) != 0xAA55AA55) return AVERROR_INVALIDDATA; return 0; } static int cin_read_packet(AVFormatContext *s, AVPacket *pkt) { CinDemuxContext *cin = s->priv_data; ByteIOContext *pb = s->pb; CinFrameHeader *hdr = &cin->frame_header; int rc, palette_type, pkt_size; if (cin->audio_buffer_size == 0) { rc = cin_read_frame_header(cin, pb); if (rc) return rc; if ((int16_t)hdr->pal_colors_count < 0) { hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count; palette_type = 1; } else { palette_type = 0; } /* palette and video packet */ pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size; if (av_new_packet(pkt, 4 + pkt_size)) return AVERROR(ENOMEM); pkt->stream_index = cin->video_stream_index; pkt->pts = cin->video_stream_pts++; pkt->data[0] = palette_type; pkt->data[1] = hdr->pal_colors_count & 0xFF; pkt->data[2] = hdr->pal_colors_count >> 8; pkt->data[3] = hdr->video_frame_type; if (get_buffer(pb, &pkt->data[4], pkt_size) != pkt_size) return AVERROR(EIO); /* sound buffer will be processed on next read_packet() call */ cin->audio_buffer_size = hdr->audio_frame_size; return 0; } /* audio packet */ if (av_new_packet(pkt, cin->audio_buffer_size)) return AVERROR(ENOMEM); pkt->stream_index = cin->audio_stream_index; pkt->pts = cin->audio_stream_pts; cin->audio_stream_pts += cin->audio_buffer_size * 2 / cin->file_header.audio_frame_size; if (get_buffer(pb, pkt->data, cin->audio_buffer_size) != cin->audio_buffer_size) return AVERROR(EIO); cin->audio_buffer_size = 0; return 0; } AVInputFormat dsicin_demuxer = { "dsicin", NULL_IF_CONFIG_SMALL("Delphine Software International CIN format"), sizeof(CinDemuxContext), cin_probe, cin_read_header, cin_read_packet, };