diff options
Diffstat (limited to 'ffmpeg/libavformat/dsicin.c')
| -rw-r--r-- | ffmpeg/libavformat/dsicin.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/dsicin.c b/ffmpeg/libavformat/dsicin.c new file mode 100644 index 0000000..b8ca57c --- /dev/null +++ b/ffmpeg/libavformat/dsicin.c @@ -0,0 +1,232 @@ +/* + * 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 + * Delphine Software International CIN file demuxer + */ + +#include "libavutil/channel_layout.h" +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "internal.h" +#include "avio_internal.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, AVIOContext *pb) { + CinFileHeader *hdr = &cin->file_header; + + if (avio_rl32(pb) != 0x55AA0000) + return AVERROR_INVALIDDATA; + + hdr->video_frame_size = avio_rl32(pb); + hdr->video_frame_width = avio_rl16(pb); + hdr->video_frame_height = avio_rl16(pb); + hdr->audio_frequency = avio_rl32(pb); + hdr->audio_bits = avio_r8(pb); + hdr->audio_stereo = avio_r8(pb); + hdr->audio_frame_size = avio_rl16(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) +{ + int rc; + CinDemuxContext *cin = s->priv_data; + CinFileHeader *hdr = &cin->file_header; + AVIOContext *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 = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + avpriv_set_pts_info(st, 32, 1, 12); + cin->video_stream_index = st->index; + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = AV_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 = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + avpriv_set_pts_info(st, 32, 1, 22050); + cin->audio_stream_index = st->index; + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_id = AV_CODEC_ID_DSICINAUDIO; + st->codec->codec_tag = 0; /* no tag */ + st->codec->channels = 1; + st->codec->channel_layout = AV_CH_LAYOUT_MONO; + st->codec->sample_rate = 22050; + st->codec->bits_per_coded_sample = 8; + st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels; + + return 0; +} + +static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) { + CinFrameHeader *hdr = &cin->frame_header; + + hdr->video_frame_type = avio_r8(pb); + hdr->audio_frame_type = avio_r8(pb); + hdr->pal_colors_count = avio_rl16(pb); + hdr->video_frame_size = avio_rl32(pb); + hdr->audio_frame_size = avio_rl32(pb); + + if (url_feof(pb) || pb->error) + return AVERROR(EIO); + + if (avio_rl32(pb) != 0xAA55AA55) + return AVERROR_INVALIDDATA; + + return 0; +} + +static int cin_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + CinDemuxContext *cin = s->priv_data; + AVIOContext *pb = s->pb; + CinFrameHeader *hdr = &cin->frame_header; + int rc, palette_type, pkt_size; + int ret; + + 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; + + pkt_size = ffio_limit(pb, pkt_size); + + ret = av_new_packet(pkt, 4 + pkt_size); + if (ret < 0) + return ret; + + 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; + + ret = avio_read(pb, &pkt->data[4], pkt_size); + if (ret < 0) { + av_free_packet(pkt); + return ret; + } + if (ret < pkt_size) + av_shrink_packet(pkt, 4 + ret); + + /* sound buffer will be processed on next read_packet() call */ + cin->audio_buffer_size = hdr->audio_frame_size; + return 0; + } + + /* audio packet */ + ret = av_get_packet(pb, pkt, cin->audio_buffer_size); + if (ret < 0) + return ret; + + pkt->stream_index = cin->audio_stream_index; + pkt->pts = cin->audio_stream_pts; + pkt->duration = cin->audio_buffer_size - (pkt->pts == 0); + cin->audio_stream_pts += pkt->duration; + cin->audio_buffer_size = 0; + return 0; +} + +AVInputFormat ff_dsicin_demuxer = { + .name = "dsicin", + .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"), + .priv_data_size = sizeof(CinDemuxContext), + .read_probe = cin_probe, + .read_header = cin_read_header, + .read_packet = cin_read_packet, +}; |