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yuv4mpeg pipe reader for libavformat patch by (D Richard Felker III <dalias at aerifal dot cx>)

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Originally committed as revision 2102 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
D Richard Felker III 2003-08-05 09:32:31 +00:00 committed by Michael Niedermayer
parent 769fc4660c
commit 2864dfd579
3 changed files with 101 additions and 1 deletions
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2
libavformat/allformats.c
View File

@ -54,7 +54,7 @@ void av_register_all(void)
#ifdef AMR_NB
amr_init();
#endif
av_register_output_format(&yuv4mpegpipe_oformat);
yuv4mpeg_init();
#ifdef CONFIG_VORBIS
ogg_init();

3
libavformat/avformat.h
View File

@ -328,6 +328,9 @@ int wav_init(void);
/* raw.c */
int raw_init(void);
/* yuv4mpeg.c */
int yuv4mpeg_init(void);
/* ogg.c */
int ogg_init(void);

97
libavformat/yuv4mpeg.c
View File

@ -173,4 +173,101 @@ AVOutputFormat yuv4mpegpipe_oformat = {
.flags = AVFMT_RAWPICTURE,
};
#define MAX_YUV4_HEADER 50
#define MAX_FRAME_HEADER 10
static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
char header[MAX_YUV4_HEADER+1];
int i;
ByteIOContext *pb = &s->pb;
int width, height, raten, rated, aspectn, aspectd;
char lacing;
AVStream *st;
for (i=0; i<MAX_YUV4_HEADER; i++) {
header[i] = get_byte(pb);
if (header[i] == '\n') {
header[i+1] = 0;
break;
}
}
if (i == MAX_YUV4_HEADER) return -1;
if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d",
&width, &height, &raten, &rated, &lacing, &aspectn, &aspectd);
st = av_new_stream(s, 0);
st = s->streams[0];
st->codec.width = width;
st->codec.height = height;
av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
st->codec.frame_rate = raten;
st->codec.frame_rate_base = rated;
st->codec.pix_fmt = PIX_FMT_YUV420P;
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = CODEC_ID_RAWVIDEO;
return 0;
}
static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int i;
char header[MAX_FRAME_HEADER+1];
int packet_size, ret, width, height;
AVStream *st = s->streams[0];
for (i=0; i<MAX_FRAME_HEADER; i++) {
header[i] = get_byte(&s->pb);
if (header[i] == '\n') {
header[i+1] = 0;
break;
}
}
if (i == MAX_FRAME_HEADER) return -1;
if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
width = st->codec.width;
height = st->codec.height;
packet_size = avpicture_get_size(st->codec.pix_fmt, width, height);
if (packet_size < 0)
av_abort();
if (av_new_packet(pkt, packet_size) < 0)
return -EIO;
pkt->stream_index = 0;
ret = get_buffer(&s->pb, pkt->data, pkt->size);
if (ret != pkt->size) {
av_free_packet(pkt);
return -EIO;
} else {
return 0;
}
}
static int yuv4_read_close(AVFormatContext *s)
{
return 0;
}
AVInputFormat yuv4mpegpipe_iformat = {
"yuv4mpegpipe",
"YUV4MPEG pipe format",
0,
NULL,
yuv4_read_header,
yuv4_read_packet,
yuv4_read_close,
.extensions = "yuv4mpeg"
};
int yuv4mpeg_init(void)
{
av_register_input_format(&yuv4mpegpipe_iformat);
av_register_output_format(&yuv4mpegpipe_oformat);
return 0;
}