3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #define Y4M_MAGIC "YUV4MPEG2"
22 #define Y4M_FRAME_MAGIC "FRAME"
23 #define Y4M_LINE_MAX 256
25 #ifdef CONFIG_ENCODERS
27 static int yuv4_generate_header(AVFormatContext *s, char* buf)
31 int raten, rated, aspectn, aspectd, n;
35 width = st->codec.width;
36 height = st->codec.height;
38 av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
40 aspectn = st->codec.sample_aspect_ratio.num;
41 aspectd = st->codec.sample_aspect_ratio.den;
43 inter = 'p'; /* progressive is the default */
44 if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) {
45 inter = st->codec.coded_frame->top_field_first ? 't' : 'b';
48 /* construct stream header, if this is the first frame */
49 n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
56 (st->codec.pix_fmt == PIX_FMT_YUV411P) ? " C411 XYSCSS=411" : " C420mpeg2 XYSCSS=420MPEG2");
61 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
63 AVStream *st = s->streams[pkt->stream_index];
64 ByteIOContext *pb = &s->pb;
66 int* first_pkt = s->priv_data;
69 char buf2[Y4M_LINE_MAX+1];
71 uint8_t *ptr, *ptr1, *ptr2;
73 picture = (AVPicture *)pkt->data;
75 /* for the first packet we have to output the header as well */
78 if (yuv4_generate_header(s, buf2) < 0) {
79 av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
82 put_buffer(pb, buf2, strlen(buf2));
86 /* construct frame header */
88 m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
89 put_buffer(pb, buf1, strlen(buf1));
91 width = st->codec.width;
92 height = st->codec.height;
94 ptr = picture->data[0];
95 for(i=0;i<height;i++) {
96 put_buffer(pb, ptr, width);
97 ptr += picture->linesize[0];
102 ptr1 = picture->data[1];
103 ptr2 = picture->data[2];
104 for(i=0;i<height;i++) { /* Cb */
105 put_buffer(pb, ptr1, width);
106 ptr1 += picture->linesize[1];
108 for(i=0;i<height;i++) { /* Cr */
109 put_buffer(pb, ptr2, width);
110 ptr2 += picture->linesize[2];
112 put_flush_packet(pb);
116 static int yuv4_write_header(AVFormatContext *s)
118 int* first_pkt = s->priv_data;
120 if (s->nb_streams != 1)
123 if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) {
124 av_log(s, AV_LOG_ERROR, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n");
126 else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) {
127 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");
135 static int yuv4_write_trailer(AVFormatContext *s)
140 AVOutputFormat yuv4mpegpipe_oformat = {
142 "YUV4MPEG pipe format",
151 .flags = AVFMT_RAWPICTURE,
153 #endif //CONFIG_ENCODERS
155 /* Header size increased to allow room for optional flags */
156 #define MAX_YUV4_HEADER 80
157 #define MAX_FRAME_HEADER 10
159 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
161 char header[MAX_YUV4_HEADER+1];
163 ByteIOContext *pb = &s->pb;
164 int width, height, raten, rated, aspectn, aspectd;
168 for (i=0; i<MAX_YUV4_HEADER; i++) {
169 header[i] = get_byte(pb);
170 if (header[i] == '\n') {
175 if (i == MAX_YUV4_HEADER) return -1;
176 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
177 sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d",
178 &width, &height, &raten, &rated, &lacing, &aspectn, &aspectd);
180 st = av_new_stream(s, 0);
182 st->codec.width = width;
183 st->codec.height = height;
184 av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
185 st->codec.frame_rate = raten;
186 st->codec.frame_rate_base = rated;
187 st->codec.pix_fmt = PIX_FMT_YUV420P;
188 st->codec.codec_type = CODEC_TYPE_VIDEO;
189 st->codec.codec_id = CODEC_ID_RAWVIDEO;
190 st->codec.sample_aspect_ratio= (AVRational){aspectn, aspectd};
195 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
198 char header[MAX_FRAME_HEADER+1];
199 int packet_size, ret, width, height;
200 AVStream *st = s->streams[0];
202 for (i=0; i<MAX_FRAME_HEADER; i++) {
203 header[i] = get_byte(&s->pb);
204 if (header[i] == '\n') {
209 if (i == MAX_FRAME_HEADER) return -1;
210 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
212 width = st->codec.width;
213 height = st->codec.height;
215 packet_size = avpicture_get_size(st->codec.pix_fmt, width, height);
219 if (av_new_packet(pkt, packet_size) < 0)
222 pkt->stream_index = 0;
223 ret = get_buffer(&s->pb, pkt->data, pkt->size);
224 if (ret != pkt->size) {
232 static int yuv4_read_close(AVFormatContext *s)
237 AVInputFormat yuv4mpegpipe_iformat = {
239 "YUV4MPEG pipe format",
245 .extensions = "yuv4mpeg"
248 int yuv4mpeg_init(void)
250 av_register_input_format(&yuv4mpegpipe_iformat);
251 #ifdef CONFIG_ENCODERS
252 av_register_output_format(&yuv4mpegpipe_oformat);
253 #endif //CONFIG_ENCODERS