mirror of
https://github.com/FFmpeg/FFmpeg.git
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148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
/*
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* Raw DV format
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* Copyright (c) 2002 Fabrice Bellard.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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#define NTSC_FRAME_SIZE 120000
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#define PAL_FRAME_SIZE 144000
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typedef struct DVDemuxContext {
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int is_audio;
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uint8_t buf[PAL_FRAME_SIZE];
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int size;
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} DVDemuxContext;
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/* raw input */
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static int dv_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *vst, *ast;
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DVDemuxContext *c = s->priv_data;
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vst = av_new_stream(s, 0);
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if (!vst)
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return AVERROR_NOMEM;
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vst->codec.codec_type = CODEC_TYPE_VIDEO;
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vst->codec.codec_id = CODEC_ID_DVVIDEO;
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ast = av_new_stream(s, 1);
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if (!ast)
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return AVERROR_NOMEM;
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ast->codec.codec_type = CODEC_TYPE_AUDIO;
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ast->codec.codec_id = CODEC_ID_DVAUDIO;
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ast->codec.channels = 2;
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c->is_audio = 0;
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return 0;
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}
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static void __destruct_pkt(struct AVPacket *pkt)
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{
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pkt->data = NULL; pkt->size = 0;
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return;
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}
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static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, dsf;
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DVDemuxContext *c = s->priv_data;
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if (!c->is_audio) {
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ret = get_buffer(&s->pb, c->buf, 4);
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if (ret <= 0)
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return -EIO;
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dsf = c->buf[3] & 0x80;
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if (!dsf)
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c->size = NTSC_FRAME_SIZE;
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else
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c->size = PAL_FRAME_SIZE;
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ret = get_buffer(&s->pb, c->buf + 4, c->size - 4);
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if (ret <= 0)
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return -EIO;
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}
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av_init_packet(pkt);
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pkt->destruct = __destruct_pkt;
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pkt->data = c->buf;
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pkt->size = c->size;
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pkt->stream_index = c->is_audio;
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c->is_audio = !c->is_audio;
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return c->size;
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}
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static int dv_read_close(AVFormatContext *s)
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{
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return 0;
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}
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static AVInputFormat dv_iformat = {
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"dv",
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"DV video format",
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sizeof(DVDemuxContext),
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NULL,
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dv_read_header,
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dv_read_packet,
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dv_read_close,
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.extensions = "dv",
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};
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#if 0
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int dv_write_header(struct AVFormatContext *s)
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{
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return 0;
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}
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int dv_write_packet(struct AVFormatContext *s,
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int stream_index,
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unsigned char *buf, int size, int force_pts)
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{
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put_buffer(&s->pb, buf, size);
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put_flush_packet(&s->pb);
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return 0;
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}
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int dv_write_trailer(struct AVFormatContext *s)
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{
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return 0;
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}
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AVOutputFormat dv_oformat = {
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"dv",
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"DV video format",
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NULL,
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"dv",
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0,
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CODEC_ID_DVVIDEO,
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CODEC_ID_DVAUDIO,
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dv_write_header,
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dv_write_packet,
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dv_write_trailer,
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};
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#endif
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int dv_init(void)
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{
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av_register_input_format(&dv_iformat);
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// av_register_output_format(&dv_oformat);
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return 0;
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}
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