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/*
* YUV4MPEG format
* Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avformat.h"
#define Y4M_MAGIC "YUV4MPEG2"
#define Y4M_FRAME_MAGIC "FRAME"
#define Y4M_LINE_MAX 256
#ifdef CONFIG_ENCODERS
static int yuv4_generate_header(AVFormatContext *s, char* buf)
{
AVStream *st;
int width, height;
int raten, rated, aspectn, aspectd, n;
char inter;
st = s->streams[0];
width = st->codec.width;
height = st->codec.height;
av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
aspectn = st->codec.sample_aspect_ratio.num;
aspectd = st->codec.sample_aspect_ratio.den;
inter = 'p'; /* progressive is the default */
if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) {
inter = st->codec.coded_frame->top_field_first ? 't' : 'b';
}
/* construct stream header, if this is the first frame */
n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
Y4M_MAGIC,
width,
height,
raten, rated,
inter,
aspectn, aspectd,
(st->codec.pix_fmt == PIX_FMT_YUV411P) ? " C411 XYSCSS=411" : " C420mpeg2 XYSCSS=420MPEG2");
return n;
}
static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVStream *st = s->streams[pkt->stream_index];
ByteIOContext *pb = &s->pb;
AVPicture *picture;
int* first_pkt = s->priv_data;
int width, height;
int i, m;
char buf2[Y4M_LINE_MAX+1];
char buf1[20];
uint8_t *ptr, *ptr1, *ptr2;
picture = (AVPicture *)pkt->data;
/* for the first packet we have to output the header as well */
if (*first_pkt) {
*first_pkt = 0;
if (yuv4_generate_header(s, buf2) < 0) {
av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
return AVERROR_IO;
} else {
put_buffer(pb, buf2, strlen(buf2));
}
}
/* construct frame header */
m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
put_buffer(pb, buf1, strlen(buf1));
width = st->codec.width;
height = st->codec.height;
ptr = picture->data[0];
for(i=0;i<height;i++) {
put_buffer(pb, ptr, width);
ptr += picture->linesize[0];
}
height >>= 1;
width >>= 1;
ptr1 = picture->data[1];
ptr2 = picture->data[2];
for(i=0;i<height;i++) { /* Cb */
put_buffer(pb, ptr1, width);
ptr1 += picture->linesize[1];
}
for(i=0;i<height;i++) { /* Cr */
put_buffer(pb, ptr2, width);
ptr2 += picture->linesize[2];
}
put_flush_packet(pb);
return 0;
}
static int yuv4_write_header(AVFormatContext *s)
{
int* first_pkt = s->priv_data;
if (s->nb_streams != 1)
return AVERROR_IO;
if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) {
av_log(s, AV_LOG_ERROR, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n");
}
else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) {
av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles 4:2:0, 4:1:1 YUV data. Use -pix_fmt to select one.\n");
return AVERROR_IO;
}
*first_pkt = 1;
return 0;
}
static int yuv4_write_trailer(AVFormatContext *s)
{
return 0;
}
AVOutputFormat yuv4mpegpipe_oformat = {
"yuv4mpegpipe",
"YUV4MPEG pipe format",
"",
"yuv4mpeg",
sizeof(int),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
yuv4_write_header,
yuv4_write_packet,
yuv4_write_trailer,
.flags = AVFMT_RAWPICTURE,
};
#endif //CONFIG_ENCODERS
/* Header size increased to allow room for optional flags */
#define MAX_YUV4_HEADER 80
#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;
st->codec.sample_aspect_ratio= (AVRational){aspectn, aspectd};
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 AVERROR_IO;
pkt->stream_index = 0;
ret = get_buffer(&s->pb, pkt->data, pkt->size);
if (ret != pkt->size) {
av_free_packet(pkt);
return AVERROR_IO;
} 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);
#ifdef CONFIG_ENCODERS
av_register_output_format(&yuv4mpegpipe_oformat);
#endif //CONFIG_ENCODERS
return 0;
}
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