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ffmpeg / libavformat / dsicin.c @ e1a794b2

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/*
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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 FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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 dsicin.c
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 * Delphine Software International CIN file demuxer
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 */
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#include "avformat.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, ByteIOContext *pb) {
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    CinFileHeader *hdr = &cin->file_header;
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    if (get_le32(pb) != 0x55AA0000)
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        return AVERROR_INVALIDDATA;
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    hdr->video_frame_size   = get_le32(pb);
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    hdr->video_frame_width  = get_le16(pb);
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    hdr->video_frame_height = get_le16(pb);
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    hdr->audio_frequency    = get_le32(pb);
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    hdr->audio_bits         = get_byte(pb);
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    hdr->audio_stereo       = get_byte(pb);
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    hdr->audio_frame_size   = get_le16(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, AVFormatParameters *ap)
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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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    ByteIOContext *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 = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    av_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 = CODEC_TYPE_VIDEO;
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    st->codec->codec_id = 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 = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    av_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 = CODEC_TYPE_AUDIO;
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    st->codec->codec_id = 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_sample = 16;
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    st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample * st->codec->channels;
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    st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
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    return 0;
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}
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static int cin_read_frame_header(CinDemuxContext *cin, ByteIOContext *pb) {
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    CinFrameHeader *hdr = &cin->frame_header;
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    hdr->video_frame_type = get_byte(pb);
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    hdr->audio_frame_type = get_byte(pb);
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    hdr->pal_colors_count = get_le16(pb);
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    hdr->video_frame_size = get_le32(pb);
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    hdr->audio_frame_size = get_le32(pb);
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    if (url_feof(pb) || url_ferror(pb))
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        return AVERROR(EIO);
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    if (get_le32(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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    ByteIOContext *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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    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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        if (av_new_packet(pkt, 4 + pkt_size))
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            return AVERROR(ENOMEM);
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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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        if (get_buffer(pb, &pkt->data[4], pkt_size) != pkt_size)
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            return AVERROR(EIO);
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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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    if (av_new_packet(pkt, cin->audio_buffer_size))
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        return AVERROR(ENOMEM);
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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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    cin->audio_stream_pts += cin->audio_buffer_size * 2 / cin->file_header.audio_frame_size;
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    if (get_buffer(pb, pkt->data, cin->audio_buffer_size) != cin->audio_buffer_size)
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        return AVERROR(EIO);
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    cin->audio_buffer_size = 0;
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    return 0;
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}
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AVInputFormat dsicin_demuxer = {
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    "dsicin",
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    "Delphine Software International CIN format",
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    sizeof(CinDemuxContext),
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    cin_probe,
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    cin_read_header,
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    cin_read_packet,
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};