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
22 #include "libavutil/pixdesc.h"
26 #define Y4M_MAGIC "YUV4MPEG2"
27 #define Y4M_FRAME_MAGIC "FRAME"
28 #define Y4M_LINE_MAX 256
30 struct frame_attributes {
35 #if CONFIG_YUV4MPEGPIPE_MUXER
36 static int yuv4_generate_header(AVFormatContext *s, char* buf)
40 int raten, rated, aspectn, aspectd, n;
42 const char *colorspace = "";
45 width = st->codec->width;
46 height = st->codec->height;
48 av_reduce(&raten, &rated, st->codec->time_base.den,
49 st->codec->time_base.num, (1UL << 31) - 1);
51 aspectn = st->sample_aspect_ratio.num;
52 aspectd = st->sample_aspect_ratio.den;
54 if (aspectn == 0 && aspectd == 1)
55 aspectd = 0; // 0:0 means unknown
57 inter = 'p'; /* progressive is the default */
58 if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame)
59 inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
61 switch (st->codec->pix_fmt) {
62 case AV_PIX_FMT_GRAY8:
63 colorspace = " Cmono";
65 case AV_PIX_FMT_YUV411P:
66 colorspace = " C411 XYSCSS=411";
68 case AV_PIX_FMT_YUV420P:
69 switch (st->codec->chroma_sample_location) {
70 case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break;
71 case AVCHROMA_LOC_LEFT: colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break;
72 default: colorspace = " C420jpeg XYSCSS=420JPEG"; break;
75 case AV_PIX_FMT_YUV422P:
76 colorspace = " C422 XYSCSS=422";
78 case AV_PIX_FMT_YUV444P:
79 colorspace = " C444 XYSCSS=444";
83 /* construct stream header, if this is the first frame */
84 n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
85 Y4M_MAGIC, width, height, raten, rated, inter,
86 aspectn, aspectd, colorspace);
91 static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
93 AVStream *st = s->streams[pkt->stream_index];
94 AVIOContext *pb = s->pb;
96 int* first_pkt = s->priv_data;
97 int width, height, h_chroma_shift, v_chroma_shift;
99 char buf2[Y4M_LINE_MAX + 1];
101 uint8_t *ptr, *ptr1, *ptr2;
103 picture = (AVPicture *)pkt->data;
105 /* for the first packet we have to output the header as well */
108 if (yuv4_generate_header(s, buf2) < 0) {
109 av_log(s, AV_LOG_ERROR,
110 "Error. YUV4MPEG stream header write failed.\n");
113 avio_write(pb, buf2, strlen(buf2));
117 /* construct frame header */
119 snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
120 avio_write(pb, buf1, strlen(buf1));
122 width = st->codec->width;
123 height = st->codec->height;
125 ptr = picture->data[0];
126 for (i = 0; i < height; i++) {
127 avio_write(pb, ptr, width);
128 ptr += picture->linesize[0];
131 if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8) {
132 // Adjust for smaller Cb and Cr planes
133 av_pix_fmt_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
135 width >>= h_chroma_shift;
136 height >>= v_chroma_shift;
138 ptr1 = picture->data[1];
139 ptr2 = picture->data[2];
140 for (i = 0; i < height; i++) { /* Cb */
141 avio_write(pb, ptr1, width);
142 ptr1 += picture->linesize[1];
144 for (i = 0; i < height; i++) { /* Cr */
145 avio_write(pb, ptr2, width);
146 ptr2 += picture->linesize[2];
153 static int yuv4_write_header(AVFormatContext *s)
155 int *first_pkt = s->priv_data;
157 if (s->nb_streams != 1)
160 if (s->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
161 av_log(s, AV_LOG_ERROR, "ERROR: Only rawvideo supported.\n");
162 return AVERROR_INVALIDDATA;
165 if (s->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUV411P) {
166 av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV "
167 "stream, some mjpegtools might not work.\n");
168 } else if ((s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV420P) &&
169 (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV422P) &&
170 (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_GRAY8) &&
171 (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV444P)) {
172 av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, "
173 "yuv422p, yuv420p, yuv411p and gray pixel formats. "
174 "Use -pix_fmt to select one.\n");
182 AVOutputFormat ff_yuv4mpegpipe_muxer = {
183 .name = "yuv4mpegpipe",
184 .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
187 .priv_data_size = sizeof(int),
188 .audio_codec = AV_CODEC_ID_NONE,
189 .video_codec = AV_CODEC_ID_RAWVIDEO,
190 .write_header = yuv4_write_header,
191 .write_packet = yuv4_write_packet,
192 .flags = AVFMT_RAWPICTURE,
196 /* Header size increased to allow room for optional flags */
197 #define MAX_YUV4_HEADER 80
198 #define MAX_FRAME_HEADER 80
200 static int yuv4_read_header(AVFormatContext *s)
202 char header[MAX_YUV4_HEADER + 10]; // Include headroom for
203 // the longest option
204 char *tokstart, *tokend, *header_end;
206 AVIOContext *pb = s->pb;
207 int width = -1, height = -1, raten = 0,
208 rated = 0, aspectn = 0, aspectd = 0;
209 enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
210 enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
212 struct frame_attributes *s1 = s->priv_data;
214 for (i = 0; i < MAX_YUV4_HEADER; i++) {
215 header[i] = avio_r8(pb);
216 if (header[i] == '\n') {
217 header[i + 1] = 0x20; // Add a space after last option.
218 // Makes parsing "444" vs "444alpha" easier.
223 if (i == MAX_YUV4_HEADER)
225 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
228 s1->interlaced_frame = 0;
229 s1->top_field_first = 0;
230 header_end = &header[i + 1]; // Include space
231 for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
232 tokstart < header_end; tokstart++) {
233 if (*tokstart == 0x20)
235 switch (*tokstart++) {
236 case 'W': // Width. Required.
237 width = strtol(tokstart, &tokend, 10);
240 case 'H': // Height. Required.
241 height = strtol(tokstart, &tokend, 10);
244 case 'C': // Color space
245 if (strncmp("420jpeg", tokstart, 7) == 0) {
246 pix_fmt = AV_PIX_FMT_YUV420P;
247 chroma_sample_location = AVCHROMA_LOC_CENTER;
248 } else if (strncmp("420mpeg2", tokstart, 8) == 0) {
249 pix_fmt = AV_PIX_FMT_YUV420P;
250 chroma_sample_location = AVCHROMA_LOC_LEFT;
251 } else if (strncmp("420paldv", tokstart, 8) == 0) {
252 pix_fmt = AV_PIX_FMT_YUV420P;
253 chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
254 } else if (strncmp("420", tokstart, 3) == 0) {
255 pix_fmt = AV_PIX_FMT_YUV420P;
256 chroma_sample_location = AVCHROMA_LOC_CENTER;
257 } else if (strncmp("411", tokstart, 3) == 0)
258 pix_fmt = AV_PIX_FMT_YUV411P;
259 else if (strncmp("422", tokstart, 3) == 0)
260 pix_fmt = AV_PIX_FMT_YUV422P;
261 else if (strncmp("444alpha", tokstart, 8) == 0 ) {
262 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
263 "YUV4MPEG stream.\n");
265 } else if (strncmp("444", tokstart, 3) == 0)
266 pix_fmt = AV_PIX_FMT_YUV444P;
267 else if (strncmp("mono", tokstart, 4) == 0) {
268 pix_fmt = AV_PIX_FMT_GRAY8;
270 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
274 while (tokstart < header_end && *tokstart != 0x20)
277 case 'I': // Interlace type
278 switch (*tokstart++){
282 s1->interlaced_frame = 0;
285 s1->interlaced_frame = 1;
286 s1->top_field_first = 1;
289 s1->interlaced_frame = 1;
290 s1->top_field_first = 0;
293 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
294 "interlaced and non-interlaced frames.\n");
297 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
301 case 'F': // Frame rate
302 sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
303 while (tokstart < header_end && *tokstart != 0x20)
306 case 'A': // Pixel aspect
307 sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
308 while (tokstart < header_end && *tokstart != 0x20)
311 case 'X': // Vendor extensions
312 if (strncmp("YSCSS=", tokstart, 6) == 0) {
313 // Older nonstandard pixel format representation
315 if (strncmp("420JPEG", tokstart, 7) == 0)
316 alt_pix_fmt = AV_PIX_FMT_YUV420P;
317 else if (strncmp("420MPEG2", tokstart, 8) == 0)
318 alt_pix_fmt = AV_PIX_FMT_YUV420P;
319 else if (strncmp("420PALDV", tokstart, 8) == 0)
320 alt_pix_fmt = AV_PIX_FMT_YUV420P;
321 else if (strncmp("411", tokstart, 3) == 0)
322 alt_pix_fmt = AV_PIX_FMT_YUV411P;
323 else if (strncmp("422", tokstart, 3) == 0)
324 alt_pix_fmt = AV_PIX_FMT_YUV422P;
325 else if (strncmp("444", tokstart, 3) == 0)
326 alt_pix_fmt = AV_PIX_FMT_YUV444P;
328 while (tokstart < header_end && *tokstart != 0x20)
334 if (width == -1 || height == -1) {
335 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
339 if (pix_fmt == AV_PIX_FMT_NONE) {
340 if (alt_pix_fmt == AV_PIX_FMT_NONE)
341 pix_fmt = AV_PIX_FMT_YUV420P;
343 pix_fmt = alt_pix_fmt;
346 if (raten <= 0 || rated <= 0) {
347 // Frame rate unknown
352 if (aspectn == 0 && aspectd == 0) {
353 // Pixel aspect unknown
357 st = avformat_new_stream(s, NULL);
359 return AVERROR(ENOMEM);
360 st->codec->width = width;
361 st->codec->height = height;
362 av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
363 avpriv_set_pts_info(st, 64, rated, raten);
364 st->codec->pix_fmt = pix_fmt;
365 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
366 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
367 st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
368 st->codec->chroma_sample_location = chroma_sample_location;
373 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
376 char header[MAX_FRAME_HEADER+1];
377 int packet_size, width, height, ret;
378 AVStream *st = s->streams[0];
379 struct frame_attributes *s1 = s->priv_data;
381 for (i = 0; i < MAX_FRAME_HEADER; i++) {
382 header[i] = avio_r8(s->pb);
383 if (header[i] == '\n') {
390 else if (s->pb->eof_reached)
392 else if (i == MAX_FRAME_HEADER)
393 return AVERROR_INVALIDDATA;
395 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
396 return AVERROR_INVALIDDATA;
398 width = st->codec->width;
399 height = st->codec->height;
401 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
405 ret = av_get_packet(s->pb, pkt, packet_size);
408 else if (ret != packet_size)
409 return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
411 if (st->codec->coded_frame) {
412 st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
413 st->codec->coded_frame->top_field_first = s1->top_field_first;
416 pkt->stream_index = 0;
420 static int yuv4_probe(AVProbeData *pd)
422 /* check file header */
423 if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
424 return AVPROBE_SCORE_MAX;
429 #if CONFIG_YUV4MPEGPIPE_DEMUXER
430 AVInputFormat ff_yuv4mpegpipe_demuxer = {
431 .name = "yuv4mpegpipe",
432 .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
433 .priv_data_size = sizeof(struct frame_attributes),
434 .read_probe = yuv4_probe,
435 .read_header = yuv4_read_header,
436 .read_packet = yuv4_read_packet,