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authorFabrice Bellard <fabrice@bellard.org>2003-01-11 04:58:36 +0000
committerFabrice Bellard <fabrice@bellard.org>2003-01-11 04:58:36 +0000
commit0b9fb89d58d3311c42b120da36e2ec850fd96969 (patch)
treef51e30c43ebf07f053e055bfd06b58785d332939
parent290c5fa640f5f4a69abe2fc1bfd53b0535a358cb (diff)
downloadffmpeg-0b9fb89d58d3311c42b120da36e2ec850fd96969.tar.gz
extracted yuv4mpeg from img.c (untested)
Originally committed as revision 1437 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r--libavformat/yuv4mpeg.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/libavformat/yuv4mpeg.c b/libavformat/yuv4mpeg.c
new file mode 100644
index 0000000000..cf451e3210
--- /dev/null
+++ b/libavformat/yuv4mpeg.c
@@ -0,0 +1,164 @@
+/*
+ * 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
+
+static int yuv4_write_header(AVFormatContext *s)
+{
+ AVStream *st;
+ int width, height;
+ int raten, rated, aspectn, aspectd, fps, fps1, n;
+ char buf[Y4M_LINE_MAX+1];
+
+ if (s->nb_streams != 1)
+ return -EIO;
+
+ st = s->streams[0];
+ width = st->codec.width;
+ height = st->codec.height;
+
+ fps = st->codec.frame_rate;
+ fps1 = (((float)fps / FRAME_RATE_BASE) * 1000);
+
+ /* Sorry about this messy code, but mpeg2enc is very picky about
+ * the framerates it accepts. */
+ switch(fps1) {
+ case 23976:
+ raten = 24000; /* turn the framerate into a ratio */
+ rated = 1001;
+ break;
+ case 29970:
+ raten = 30000;
+ rated = 1001;
+ break;
+ case 25000:
+ raten = 25;
+ rated = 1;
+ break;
+ case 30000:
+ raten = 30;
+ rated = 1;
+ break;
+ case 24000:
+ raten = 24;
+ rated = 1;
+ break;
+ case 50000:
+ raten = 50;
+ rated = 1;
+ break;
+ case 59940:
+ raten = 60000;
+ rated = 1001;
+ break;
+ case 60000:
+ raten = 60;
+ rated = 1;
+ break;
+ default:
+ raten = fps1; /* this setting should work, but often doesn't */
+ rated = 1000;
+ break;
+ }
+
+ aspectn = 1;
+ aspectd = 1; /* ffmpeg always uses a 1:1 aspect ratio */
+
+ /* construct stream header, if this is the first frame */
+ n = snprintf(buf, sizeof(buf), "%s W%d H%d F%d:%d I%s A%d:%d\n",
+ Y4M_MAGIC,
+ width,
+ height,
+ raten, rated,
+ "p", /* ffmpeg seems to only output progressive video */
+ aspectn, aspectd);
+ if (n < 0) {
+ fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
+ return -EIO;
+ } else {
+ put_buffer(&s->pb, buf, strlen(buf));
+ }
+ return 0;
+}
+
+static int yuv4_write_packet(AVFormatContext *s, int stream_index,
+ UINT8 *buf, int size, int force_pts)
+{
+ AVStream *st = s->streams[stream_index];
+ ByteIOContext *pb = &s->pb;
+ AVPicture *picture;
+ int width, height;
+ int i, m;
+ char buf1[20];
+ UINT8 *ptr, *ptr1, *ptr2;
+
+ picture = (AVPicture *)buf;
+
+ /* 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_trailer(AVFormatContext *s)
+{
+ return 0;
+}
+
+AVOutputFormat yuv4mpegpipe_oformat = {
+ "yuv4mpegpipe",
+ "YUV4MPEG pipe format",
+ "",
+ "yuv4mpeg",
+ 0,
+ CODEC_ID_NONE,
+ CODEC_ID_RAWVIDEO,
+ yuv4_write_header,
+ yuv4_write_packet,
+ yuv4_write_trailer,
+ .flags = AVFMT_RAWPICTURE,
+};
+
+