3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #define Y4M_MAGIC "YUV4MPEG2"
25 #define Y4M_FRAME_MAGIC "FRAME"
26 #define Y4M_LINE_MAX 256
28 struct frame_attributes {
33 #if CONFIG_YUV4MPEGPIPE_MUXER
34 static int yuv4_generate_header(AVFormatContext *s, char* buf)
38 int raten, rated, aspectn, aspectd, n;
40 const char *colorspace = "";
43 width = st->codec->width;
44 height = st->codec->height;
46 av_reduce(&raten, &rated, st->codec->time_base.den,
47 st->codec->time_base.num, (1UL << 31) - 1);
49 aspectn = st->sample_aspect_ratio.num;
50 aspectd = st->sample_aspect_ratio.den;
52 if (aspectn == 0 && aspectd == 1)
53 aspectd = 0; // 0:0 means unknown
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->top_field_first ? 't' : 'b';
59 switch (st->codec->pix_fmt) {
61 colorspace = " Cmono";
64 colorspace = " C411 XYSCSS=411";
67 switch (st->codec->chroma_sample_location) {
68 case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break;
69 case AVCHROMA_LOC_LEFT: colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break;
70 default: colorspace = " C420jpeg XYSCSS=420JPEG"; break;
74 colorspace = " C422 XYSCSS=422";
77 colorspace = " C444 XYSCSS=444";
81 /* construct stream header, if this is the first frame */
82 n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
83 Y4M_MAGIC, width, height, raten, rated, inter,
84 aspectn, aspectd, colorspace);
89 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
91 AVStream *st = s->streams[pkt->stream_index];
92 AVIOContext *pb = s->pb;
94 int* first_pkt = s->priv_data;
95 int width, height, h_chroma_shift, v_chroma_shift;
97 char buf2[Y4M_LINE_MAX + 1];
99 uint8_t *ptr, *ptr1, *ptr2;
101 picture = (AVPicture *)pkt->data;
103 /* for the first packet we have to output the header as well */
106 if (yuv4_generate_header(s, buf2) < 0) {
107 av_log(s, AV_LOG_ERROR,
108 "Error. YUV4MPEG stream header write failed.\n");
111 avio_write(pb, buf2, strlen(buf2));
115 /* construct frame header */
117 snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
118 avio_write(pb, buf1, strlen(buf1));
120 width = st->codec->width;
121 height = st->codec->height;
123 ptr = picture->data[0];
124 for (i = 0; i < height; i++) {
125 avio_write(pb, ptr, width);
126 ptr += picture->linesize[0];
129 if (st->codec->pix_fmt != PIX_FMT_GRAY8) {
130 // Adjust for smaller Cb and Cr planes
131 avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
133 width >>= h_chroma_shift;
134 height >>= v_chroma_shift;
136 ptr1 = picture->data[1];
137 ptr2 = picture->data[2];
138 for (i = 0; i < height; i++) { /* Cb */
139 avio_write(pb, ptr1, width);
140 ptr1 += picture->linesize[1];
142 for (i = 0; i < height; i++) { /* Cr */
143 avio_write(pb, ptr2, width);
144 ptr2 += picture->linesize[2];
151 static int yuv4_write_header(AVFormatContext *s)
153 int *first_pkt = s->priv_data;
155 if (s->nb_streams != 1)
158 if (s->streams[0]->codec->pix_fmt == PIX_FMT_YUV411P) {
159 av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV "
160 "stream, some mjpegtools might not work.\n");
161 } else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
162 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
163 (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
164 (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
165 av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, "
166 "yuv422p, yuv420p, yuv411p and gray pixel formats. "
167 "Use -pix_fmt to select one.\n");
175 AVOutputFormat ff_yuv4mpegpipe_muxer = {
176 .name = "yuv4mpegpipe",
177 .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
180 .priv_data_size = sizeof(int),
181 .audio_codec = CODEC_ID_NONE,
182 .video_codec = CODEC_ID_RAWVIDEO,
183 .write_header = yuv4_write_header,
184 .write_packet = yuv4_write_packet,
185 .flags = AVFMT_RAWPICTURE,
189 /* Header size increased to allow room for optional flags */
190 #define MAX_YUV4_HEADER 80
191 #define MAX_FRAME_HEADER 80
193 static int yuv4_read_header(AVFormatContext *s)
195 char header[MAX_YUV4_HEADER + 10]; // Include headroom for
196 // the longest option
197 char *tokstart, *tokend, *header_end;
199 AVIOContext *pb = s->pb;
200 int width = -1, height = -1, raten = 0,
201 rated = 0, aspectn = 0, aspectd = 0;
202 enum PixelFormat pix_fmt = PIX_FMT_NONE, alt_pix_fmt = PIX_FMT_NONE;
203 enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
205 struct frame_attributes *s1 = s->priv_data;
207 for (i = 0; i < MAX_YUV4_HEADER; i++) {
208 header[i] = avio_r8(pb);
209 if (header[i] == '\n') {
210 header[i + 1] = 0x20; // Add a space after last option.
211 // Makes parsing "444" vs "444alpha" easier.
216 if (i == MAX_YUV4_HEADER)
218 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
221 s1->interlaced_frame = 0;
222 s1->top_field_first = 0;
223 header_end = &header[i + 1]; // Include space
224 for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
225 tokstart < header_end; tokstart++) {
226 if (*tokstart == 0x20)
228 switch (*tokstart++) {
229 case 'W': // Width. Required.
230 width = strtol(tokstart, &tokend, 10);
233 case 'H': // Height. Required.
234 height = strtol(tokstart, &tokend, 10);
237 case 'C': // Color space
238 if (strncmp("420jpeg", tokstart, 7) == 0) {
239 pix_fmt = PIX_FMT_YUV420P;
240 chroma_sample_location = AVCHROMA_LOC_CENTER;
241 } else if (strncmp("420mpeg2", tokstart, 8) == 0) {
242 pix_fmt = PIX_FMT_YUV420P;
243 chroma_sample_location = AVCHROMA_LOC_LEFT;
244 } else if (strncmp("420paldv", tokstart, 8) == 0) {
245 pix_fmt = PIX_FMT_YUV420P;
246 chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
247 } else if (strncmp("420", tokstart, 3) == 0) {
248 pix_fmt = PIX_FMT_YUV420P;
249 chroma_sample_location = AVCHROMA_LOC_CENTER;
250 } else if (strncmp("411", tokstart, 3) == 0)
251 pix_fmt = PIX_FMT_YUV411P;
252 else if (strncmp("422", tokstart, 3) == 0)
253 pix_fmt = PIX_FMT_YUV422P;
254 else if (strncmp("444alpha", tokstart, 8) == 0 ) {
255 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
256 "YUV4MPEG stream.\n");
258 } else if (strncmp("444", tokstart, 3) == 0)
259 pix_fmt = PIX_FMT_YUV444P;
260 else if (strncmp("mono", tokstart, 4) == 0) {
261 pix_fmt = PIX_FMT_GRAY8;
263 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
267 while (tokstart < header_end && *tokstart != 0x20)
270 case 'I': // Interlace type
271 switch (*tokstart++){
275 s1->interlaced_frame = 0;
278 s1->interlaced_frame = 1;
279 s1->top_field_first = 1;
282 s1->interlaced_frame = 1;
283 s1->top_field_first = 0;
286 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
287 "interlaced and non-interlaced frames.\n");
290 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
294 case 'F': // Frame rate
295 sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
296 while (tokstart < header_end && *tokstart != 0x20)
299 case 'A': // Pixel aspect
300 sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
301 while (tokstart < header_end && *tokstart != 0x20)
304 case 'X': // Vendor extensions
305 if (strncmp("YSCSS=", tokstart, 6) == 0) {
306 // Older nonstandard pixel format representation
308 if (strncmp("420JPEG", tokstart, 7) == 0)
309 alt_pix_fmt = PIX_FMT_YUV420P;
310 else if (strncmp("420MPEG2", tokstart, 8) == 0)
311 alt_pix_fmt = PIX_FMT_YUV420P;
312 else if (strncmp("420PALDV", tokstart, 8) == 0)
313 alt_pix_fmt = PIX_FMT_YUV420P;
314 else if (strncmp("411", tokstart, 3) == 0)
315 alt_pix_fmt = PIX_FMT_YUV411P;
316 else if (strncmp("422", tokstart, 3) == 0)
317 alt_pix_fmt = PIX_FMT_YUV422P;
318 else if (strncmp("444", tokstart, 3) == 0)
319 alt_pix_fmt = PIX_FMT_YUV444P;
321 while (tokstart < header_end && *tokstart != 0x20)
327 if (width == -1 || height == -1) {
328 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
332 if (pix_fmt == PIX_FMT_NONE) {
333 if (alt_pix_fmt == PIX_FMT_NONE)
334 pix_fmt = PIX_FMT_YUV420P;
336 pix_fmt = alt_pix_fmt;
339 if (raten <= 0 || rated <= 0) {
340 // Frame rate unknown
345 if (aspectn == 0 && aspectd == 0) {
346 // Pixel aspect unknown
350 st = avformat_new_stream(s, NULL);
352 return AVERROR(ENOMEM);
353 st->codec->width = width;
354 st->codec->height = height;
355 av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
356 avpriv_set_pts_info(st, 64, rated, raten);
357 st->codec->pix_fmt = pix_fmt;
358 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
359 st->codec->codec_id = CODEC_ID_RAWVIDEO;
360 st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
361 st->codec->chroma_sample_location = chroma_sample_location;
366 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
369 char header[MAX_FRAME_HEADER+1];
370 int packet_size, width, height;
371 AVStream *st = s->streams[0];
372 struct frame_attributes *s1 = s->priv_data;
374 for (i = 0; i < MAX_FRAME_HEADER; i++) {
375 header[i] = avio_r8(s->pb);
376 if (header[i] == '\n') {
381 if (i == MAX_FRAME_HEADER)
383 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
386 width = st->codec->width;
387 height = st->codec->height;
389 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
393 if (av_get_packet(s->pb, pkt, packet_size) != packet_size)
396 if (st->codec->coded_frame) {
397 st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
398 st->codec->coded_frame->top_field_first = s1->top_field_first;
401 pkt->stream_index = 0;
405 static int yuv4_probe(AVProbeData *pd)
407 /* check file header */
408 if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
409 return AVPROBE_SCORE_MAX;
414 #if CONFIG_YUV4MPEGPIPE_DEMUXER
415 AVInputFormat ff_yuv4mpegpipe_demuxer = {
416 .name = "yuv4mpegpipe",
417 .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
418 .priv_data_size = sizeof(struct frame_attributes),
419 .read_probe = yuv4_probe,
420 .read_header = yuv4_read_header,
421 .read_packet = yuv4_read_packet,