3e712c9323d28a70f39c2c56532837153a046533
[libav.git] / libavformat / yuv4mpeg.c
1 /*
2 * YUV4MPEG format
3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
4 *
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.
9 *
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.
14 *
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
18 */
19 #include "avformat.h"
20
21 #define Y4M_MAGIC "YUV4MPEG2"
22 #define Y4M_FRAME_MAGIC "FRAME"
23 #define Y4M_LINE_MAX 256
24
25 #ifdef CONFIG_ENCODERS
26 static int yuv4_write_header(AVFormatContext *s)
27 {
28 AVStream *st;
29 int width, height;
30 int raten, rated, aspectn, aspectd, n;
31 char buf[Y4M_LINE_MAX+1];
32
33 if (s->nb_streams != 1)
34 return -EIO;
35
36 st = s->streams[0];
37 width = st->codec.width;
38 height = st->codec.height;
39
40 #if 1
41 //this is identical to the code below for exact fps
42 av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
43 #else
44 {
45 int gcd, fps, fps1;
46
47 fps = st->codec.frame_rate;
48 fps1 = (((float)fps / st->codec.frame_rate_base) * 1000);
49
50 /* Sorry about this messy code, but mpeg2enc is very picky about
51 * the framerates it accepts. */
52 switch(fps1) {
53 case 23976:
54 raten = 24000; /* turn the framerate into a ratio */
55 rated = 1001;
56 break;
57 case 29970:
58 raten = 30000;
59 rated = 1001;
60 break;
61 case 25000:
62 raten = 25;
63 rated = 1;
64 break;
65 case 30000:
66 raten = 30;
67 rated = 1;
68 break;
69 case 24000:
70 raten = 24;
71 rated = 1;
72 break;
73 case 50000:
74 raten = 50;
75 rated = 1;
76 break;
77 case 59940:
78 raten = 60000;
79 rated = 1001;
80 break;
81 case 60000:
82 raten = 60;
83 rated = 1;
84 break;
85 default:
86 raten = st->codec.frame_rate; /* this setting should work, but often doesn't */
87 rated = st->codec.frame_rate_base;
88 gcd= av_gcd(raten, rated);
89 raten /= gcd;
90 rated /= gcd;
91 break;
92 }
93 }
94 #endif
95
96 aspectn = 1;
97 aspectd = 1; /* ffmpeg always uses a 1:1 aspect ratio */ //FIXME not true anymore
98
99 /* construct stream header, if this is the first frame */
100 n = snprintf(buf, sizeof(buf), "%s W%d H%d F%d:%d I%s A%d:%d\n",
101 Y4M_MAGIC,
102 width,
103 height,
104 raten, rated,
105 "p", /* ffmpeg seems to only output progressive video */
106 aspectn, aspectd);
107 if (n < 0) {
108 fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
109 return -EIO;
110 } else {
111 put_buffer(&s->pb, buf, strlen(buf));
112 }
113 return 0;
114 }
115
116 static int yuv4_write_packet(AVFormatContext *s, int stream_index,
117 const uint8_t *buf, int size, int64_t pts)
118 {
119 AVStream *st = s->streams[stream_index];
120 ByteIOContext *pb = &s->pb;
121 AVPicture *picture;
122 int width, height;
123 int i, m;
124 char buf1[20];
125 uint8_t *ptr, *ptr1, *ptr2;
126
127 picture = (AVPicture *)buf;
128
129 /* construct frame header */
130 m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
131 put_buffer(pb, buf1, strlen(buf1));
132
133 width = st->codec.width;
134 height = st->codec.height;
135
136 ptr = picture->data[0];
137 for(i=0;i<height;i++) {
138 put_buffer(pb, ptr, width);
139 ptr += picture->linesize[0];
140 }
141
142 height >>= 1;
143 width >>= 1;
144 ptr1 = picture->data[1];
145 ptr2 = picture->data[2];
146 for(i=0;i<height;i++) { /* Cb */
147 put_buffer(pb, ptr1, width);
148 ptr1 += picture->linesize[1];
149 }
150 for(i=0;i<height;i++) { /* Cr */
151 put_buffer(pb, ptr2, width);
152 ptr2 += picture->linesize[2];
153 }
154 put_flush_packet(pb);
155 return 0;
156 }
157
158 static int yuv4_write_trailer(AVFormatContext *s)
159 {
160 return 0;
161 }
162
163 AVOutputFormat yuv4mpegpipe_oformat = {
164 "yuv4mpegpipe",
165 "YUV4MPEG pipe format",
166 "",
167 "yuv4mpeg",
168 0,
169 CODEC_ID_NONE,
170 CODEC_ID_RAWVIDEO,
171 yuv4_write_header,
172 yuv4_write_packet,
173 yuv4_write_trailer,
174 .flags = AVFMT_RAWPICTURE,
175 };
176 #endif //CONFIG_ENCODERS
177
178 /* Header size increased to allow room for optional flags */
179 #define MAX_YUV4_HEADER 80
180 #define MAX_FRAME_HEADER 10
181
182 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
183 {
184 char header[MAX_YUV4_HEADER+1];
185 int i;
186 ByteIOContext *pb = &s->pb;
187 int width, height, raten, rated, aspectn, aspectd;
188 char lacing;
189 AVStream *st;
190
191 for (i=0; i<MAX_YUV4_HEADER; i++) {
192 header[i] = get_byte(pb);
193 if (header[i] == '\n') {
194 header[i+1] = 0;
195 break;
196 }
197 }
198 if (i == MAX_YUV4_HEADER) return -1;
199 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
200 sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d",
201 &width, &height, &raten, &rated, &lacing, &aspectn, &aspectd);
202
203 st = av_new_stream(s, 0);
204 st = s->streams[0];
205 st->codec.width = width;
206 st->codec.height = height;
207 av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
208 st->codec.frame_rate = raten;
209 st->codec.frame_rate_base = rated;
210 st->codec.pix_fmt = PIX_FMT_YUV420P;
211 st->codec.codec_type = CODEC_TYPE_VIDEO;
212 st->codec.codec_id = CODEC_ID_RAWVIDEO;
213
214 return 0;
215 }
216
217 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
218 {
219 int i;
220 char header[MAX_FRAME_HEADER+1];
221 int packet_size, ret, width, height;
222 AVStream *st = s->streams[0];
223
224 for (i=0; i<MAX_FRAME_HEADER; i++) {
225 header[i] = get_byte(&s->pb);
226 if (header[i] == '\n') {
227 header[i+1] = 0;
228 break;
229 }
230 }
231 if (i == MAX_FRAME_HEADER) return -1;
232 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
233
234 width = st->codec.width;
235 height = st->codec.height;
236
237 packet_size = avpicture_get_size(st->codec.pix_fmt, width, height);
238 if (packet_size < 0)
239 av_abort();
240
241 if (av_new_packet(pkt, packet_size) < 0)
242 return -EIO;
243
244 pkt->stream_index = 0;
245 ret = get_buffer(&s->pb, pkt->data, pkt->size);
246 if (ret != pkt->size) {
247 av_free_packet(pkt);
248 return -EIO;
249 } else {
250 return 0;
251 }
252 }
253
254 static int yuv4_read_close(AVFormatContext *s)
255 {
256 return 0;
257 }
258
259 AVInputFormat yuv4mpegpipe_iformat = {
260 "yuv4mpegpipe",
261 "YUV4MPEG pipe format",
262 0,
263 NULL,
264 yuv4_read_header,
265 yuv4_read_packet,
266 yuv4_read_close,
267 .extensions = "yuv4mpeg"
268 };
269
270 int yuv4mpeg_init(void)
271 {
272 av_register_input_format(&yuv4mpegpipe_iformat);
273 #ifdef CONFIG_ENCODERS
274 av_register_output_format(&yuv4mpegpipe_oformat);
275 #endif //CONFIG_ENCODERS
276 return 0;
277 }
278