* providing MPEG codecs with a generic fields in AVFrame to use.
[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
27
28 static struct { int n; int d;} SAR[] = {{10, 11}, /* 4:3 NTSC */
29 {59, 54}, /* 4:3 PAL */
30 {40, 33}, /* 16:9 NTSC */
31 {118, 81}, /* 16:9 PAL */
32 { 1, 1}};/* should always be the last */
33
34 static int yuv4_generate_header(AVFormatContext *s, char* buf)
35 {
36 AVStream *st;
37 int width, height;
38 int raten, rated, aspectn, aspectd, n, i;
39 char inter;
40
41 st = s->streams[0];
42 width = st->codec.width;
43 height = st->codec.height;
44
45 av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
46
47 for (i=0; i<sizeof(SAR)/sizeof(SAR[0])-1; i++) {
48 if (ABS(st->codec.aspect_ratio -
49 (float)SAR[i].n/SAR[i].d * (float)width/height) < 0.05)
50 break;
51 }
52 aspectn = SAR[i].n;
53 aspectd = SAR[i].d;
54
55 inter = 'p'; /* progressive is the default */
56 if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) {
57 inter = st->codec.coded_frame->bottom_field_first ? 'b' : 't';
58 }
59
60 /* construct stream header, if this is the first frame */
61 n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
62 Y4M_MAGIC,
63 width,
64 height,
65 raten, rated,
66 inter,
67 aspectn, aspectd,
68 (st->codec.pix_fmt == PIX_FMT_YUV411P) ? " XYSCSS=411" : "");
69
70 return n;
71 }
72
73 static int yuv4_write_packet(AVFormatContext *s, int stream_index,
74 const uint8_t *buf, int size, int64_t pts)
75 {
76 AVStream *st = s->streams[stream_index];
77 ByteIOContext *pb = &s->pb;
78 AVPicture *picture;
79 int* first_pkt = s->priv_data;
80 int width, height;
81 int i, m;
82 char buf2[Y4M_LINE_MAX+1];
83 char buf1[20];
84 uint8_t *ptr, *ptr1, *ptr2;
85
86 picture = (AVPicture *)buf;
87
88 /* for the first packet we have to output the header as well */
89 if (*first_pkt) {
90 *first_pkt = 0;
91 if (yuv4_generate_header(s, buf2) < 0) {
92 fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
93 return -EIO;
94 } else {
95 put_buffer(pb, buf2, strlen(buf2));
96 }
97 }
98
99 /* construct frame header */
100
101 m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
102 put_buffer(pb, buf1, strlen(buf1));
103
104 width = st->codec.width;
105 height = st->codec.height;
106
107 ptr = picture->data[0];
108 for(i=0;i<height;i++) {
109 put_buffer(pb, ptr, width);
110 ptr += picture->linesize[0];
111 }
112
113 height >>= 1;
114 width >>= 1;
115 ptr1 = picture->data[1];
116 ptr2 = picture->data[2];
117 for(i=0;i<height;i++) { /* Cb */
118 put_buffer(pb, ptr1, width);
119 ptr1 += picture->linesize[1];
120 }
121 for(i=0;i<height;i++) { /* Cr */
122 put_buffer(pb, ptr2, width);
123 ptr2 += picture->linesize[2];
124 }
125 put_flush_packet(pb);
126 return 0;
127 }
128
129 static int yuv4_write_header(AVFormatContext *s)
130 {
131 int* first_pkt = s->priv_data;
132
133 if (s->nb_streams != 1)
134 return -EIO;
135
136 if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) {
137 fprintf(stderr, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n");
138 }
139 else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) {
140 fprintf(stderr, "ERROR: yuv4mpeg only handles 4:2:0, 4:1:1 YUV data. Use -pix_fmt to select one.\n");
141 return -EIO;
142 }
143
144 *first_pkt = 1;
145 return 0;
146 }
147
148 static int yuv4_write_trailer(AVFormatContext *s)
149 {
150 return 0;
151 }
152
153 AVOutputFormat yuv4mpegpipe_oformat = {
154 "yuv4mpegpipe",
155 "YUV4MPEG pipe format",
156 "",
157 "yuv4mpeg",
158 sizeof(int),
159 CODEC_ID_NONE,
160 CODEC_ID_RAWVIDEO,
161 yuv4_write_header,
162 yuv4_write_packet,
163 yuv4_write_trailer,
164 .flags = AVFMT_RAWPICTURE,
165 };
166 #endif //CONFIG_ENCODERS
167
168 /* Header size increased to allow room for optional flags */
169 #define MAX_YUV4_HEADER 80
170 #define MAX_FRAME_HEADER 10
171
172 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
173 {
174 char header[MAX_YUV4_HEADER+1];
175 int i;
176 ByteIOContext *pb = &s->pb;
177 int width, height, raten, rated, aspectn, aspectd;
178 char lacing;
179 AVStream *st;
180
181 for (i=0; i<MAX_YUV4_HEADER; i++) {
182 header[i] = get_byte(pb);
183 if (header[i] == '\n') {
184 header[i+1] = 0;
185 break;
186 }
187 }
188 if (i == MAX_YUV4_HEADER) return -1;
189 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
190 sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d",
191 &width, &height, &raten, &rated, &lacing, &aspectn, &aspectd);
192
193 st = av_new_stream(s, 0);
194 st = s->streams[0];
195 st->codec.width = width;
196 st->codec.height = height;
197 av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
198 st->codec.frame_rate = raten;
199 st->codec.frame_rate_base = rated;
200 st->codec.pix_fmt = PIX_FMT_YUV420P;
201 st->codec.codec_type = CODEC_TYPE_VIDEO;
202 st->codec.codec_id = CODEC_ID_RAWVIDEO;
203
204 return 0;
205 }
206
207 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
208 {
209 int i;
210 char header[MAX_FRAME_HEADER+1];
211 int packet_size, ret, width, height;
212 AVStream *st = s->streams[0];
213
214 for (i=0; i<MAX_FRAME_HEADER; i++) {
215 header[i] = get_byte(&s->pb);
216 if (header[i] == '\n') {
217 header[i+1] = 0;
218 break;
219 }
220 }
221 if (i == MAX_FRAME_HEADER) return -1;
222 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
223
224 width = st->codec.width;
225 height = st->codec.height;
226
227 packet_size = avpicture_get_size(st->codec.pix_fmt, width, height);
228 if (packet_size < 0)
229 av_abort();
230
231 if (av_new_packet(pkt, packet_size) < 0)
232 return -EIO;
233
234 pkt->stream_index = 0;
235 ret = get_buffer(&s->pb, pkt->data, pkt->size);
236 if (ret != pkt->size) {
237 av_free_packet(pkt);
238 return -EIO;
239 } else {
240 return 0;
241 }
242 }
243
244 static int yuv4_read_close(AVFormatContext *s)
245 {
246 return 0;
247 }
248
249 AVInputFormat yuv4mpegpipe_iformat = {
250 "yuv4mpegpipe",
251 "YUV4MPEG pipe format",
252 0,
253 NULL,
254 yuv4_read_header,
255 yuv4_read_packet,
256 yuv4_read_close,
257 .extensions = "yuv4mpeg"
258 };
259
260 int yuv4mpeg_init(void)
261 {
262 av_register_input_format(&yuv4mpegpipe_iformat);
263 #ifdef CONFIG_ENCODERS
264 av_register_output_format(&yuv4mpegpipe_oformat);
265 #endif //CONFIG_ENCODERS
266 return 0;
267 }
268