| /* |
| * 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, |
| }; |