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228 lines
6.5 KiB
C
228 lines
6.5 KiB
C
/*
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* Delphine Software International CIN File Demuxer
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* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Delphine Software International CIN file demuxer
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*/
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct CinFileHeader {
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int video_frame_size;
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int video_frame_width;
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int video_frame_height;
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int audio_frequency;
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int audio_bits;
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int audio_stereo;
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int audio_frame_size;
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} CinFileHeader;
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typedef struct CinFrameHeader {
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int audio_frame_type;
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int video_frame_type;
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int pal_colors_count;
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int audio_frame_size;
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int video_frame_size;
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} CinFrameHeader;
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typedef struct CinDemuxContext {
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int audio_stream_index;
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int video_stream_index;
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CinFileHeader file_header;
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int64_t audio_stream_pts;
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int64_t video_stream_pts;
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CinFrameHeader frame_header;
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int audio_buffer_size;
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} CinDemuxContext;
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static int cin_probe(AVProbeData *p)
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{
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/* header starts with this special marker */
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if (AV_RL32(&p->buf[0]) != 0x55AA0000)
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return 0;
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/* for accuracy, check some header field values */
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if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) {
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CinFileHeader *hdr = &cin->file_header;
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if (avio_rl32(pb) != 0x55AA0000)
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return AVERROR_INVALIDDATA;
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hdr->video_frame_size = avio_rl32(pb);
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hdr->video_frame_width = avio_rl16(pb);
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hdr->video_frame_height = avio_rl16(pb);
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hdr->audio_frequency = avio_rl32(pb);
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hdr->audio_bits = avio_r8(pb);
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hdr->audio_stereo = avio_r8(pb);
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hdr->audio_frame_size = avio_rl16(pb);
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if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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static int cin_read_header(AVFormatContext *s)
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{
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int rc;
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CinDemuxContext *cin = s->priv_data;
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CinFileHeader *hdr = &cin->file_header;
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AVIOContext *pb = s->pb;
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AVStream *st;
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rc = cin_read_file_header(cin, pb);
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if (rc)
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return rc;
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cin->video_stream_pts = 0;
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cin->audio_stream_pts = 0;
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cin->audio_buffer_size = 0;
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/* initialize the video decoder stream */
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 32, 1, 12);
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cin->video_stream_index = st->index;
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = AV_CODEC_ID_DSICINVIDEO;
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st->codec->codec_tag = 0; /* no fourcc */
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st->codec->width = hdr->video_frame_width;
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st->codec->height = hdr->video_frame_height;
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/* initialize the audio decoder stream */
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 32, 1, 22050);
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cin->audio_stream_index = st->index;
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = AV_CODEC_ID_DSICINAUDIO;
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st->codec->codec_tag = 0; /* no tag */
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st->codec->channels = 1;
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st->codec->sample_rate = 22050;
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st->codec->bits_per_coded_sample = 8;
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st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
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return 0;
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}
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static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) {
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CinFrameHeader *hdr = &cin->frame_header;
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hdr->video_frame_type = avio_r8(pb);
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hdr->audio_frame_type = avio_r8(pb);
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hdr->pal_colors_count = avio_rl16(pb);
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hdr->video_frame_size = avio_rl32(pb);
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hdr->audio_frame_size = avio_rl32(pb);
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if (pb->eof_reached || pb->error)
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return AVERROR(EIO);
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if (avio_rl32(pb) != 0xAA55AA55)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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CinDemuxContext *cin = s->priv_data;
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AVIOContext *pb = s->pb;
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CinFrameHeader *hdr = &cin->frame_header;
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int rc, palette_type, pkt_size;
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int ret;
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if (cin->audio_buffer_size == 0) {
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rc = cin_read_frame_header(cin, pb);
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if (rc)
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return rc;
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if ((int16_t)hdr->pal_colors_count < 0) {
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hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
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palette_type = 1;
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} else {
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palette_type = 0;
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}
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/* palette and video packet */
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pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size;
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ret = av_new_packet(pkt, 4 + pkt_size);
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if (ret < 0)
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return ret;
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pkt->stream_index = cin->video_stream_index;
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pkt->pts = cin->video_stream_pts++;
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pkt->data[0] = palette_type;
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pkt->data[1] = hdr->pal_colors_count & 0xFF;
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pkt->data[2] = hdr->pal_colors_count >> 8;
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pkt->data[3] = hdr->video_frame_type;
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ret = avio_read(pb, &pkt->data[4], pkt_size);
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if (ret < 0) {
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av_free_packet(pkt);
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return ret;
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}
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if (ret < pkt_size)
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av_shrink_packet(pkt, 4 + ret);
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/* sound buffer will be processed on next read_packet() call */
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cin->audio_buffer_size = hdr->audio_frame_size;
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return 0;
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}
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/* audio packet */
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ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
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if (ret < 0)
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return ret;
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pkt->stream_index = cin->audio_stream_index;
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pkt->pts = cin->audio_stream_pts;
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pkt->duration = cin->audio_buffer_size - (pkt->pts == 0);
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cin->audio_stream_pts += pkt->duration;
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cin->audio_buffer_size = 0;
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return 0;
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}
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AVInputFormat ff_dsicin_demuxer = {
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.name = "dsicin",
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.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"),
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.priv_data_size = sizeof(CinDemuxContext),
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.read_probe = cin_probe,
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.read_header = cin_read_header,
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.read_packet = cin_read_packet,
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};
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