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path: root/libavformat/yuv4mpegdec.c (plain)
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1/*
2 * YUV4MPEG demuxer
3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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.
11 *
12 * FFmpeg 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.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "libavutil/imgutils.h"
23
24#include "avformat.h"
25#include "internal.h"
26#include "yuv4mpeg.h"
27
28/* Header size increased to allow room for optional flags */
29#define MAX_YUV4_HEADER 80
30#define MAX_FRAME_HEADER 80
31
32static int yuv4_read_header(AVFormatContext *s)
33{
34 char header[MAX_YUV4_HEADER + 10]; // Include headroom for
35 // the longest option
36 char *tokstart, *tokend, *header_end;
37 int i;
38 AVIOContext *pb = s->pb;
39 int width = -1, height = -1, raten = 0,
40 rated = 0, aspectn = 0, aspectd = 0;
41 enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
42 enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
43 enum AVFieldOrder field_order = AV_FIELD_UNKNOWN;
44 AVStream *st;
45
46 for (i = 0; i < MAX_YUV4_HEADER; i++) {
47 header[i] = avio_r8(pb);
48 if (header[i] == '\n') {
49 header[i + 1] = 0x20; // Add a space after last option.
50 // Makes parsing "444" vs "444alpha" easier.
51 header[i + 2] = 0;
52 break;
53 }
54 }
55 if (i == MAX_YUV4_HEADER)
56 return -1;
57 if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
58 return -1;
59
60 header_end = &header[i + 1]; // Include space
61 for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
62 tokstart < header_end; tokstart++) {
63 if (*tokstart == 0x20)
64 continue;
65 switch (*tokstart++) {
66 case 'W': // Width. Required.
67 width = strtol(tokstart, &tokend, 10);
68 tokstart = tokend;
69 break;
70 case 'H': // Height. Required.
71 height = strtol(tokstart, &tokend, 10);
72 tokstart = tokend;
73 break;
74 case 'C': // Color space
75 if (strncmp("420jpeg", tokstart, 7) == 0) {
76 pix_fmt = AV_PIX_FMT_YUV420P;
77 chroma_sample_location = AVCHROMA_LOC_CENTER;
78 } else if (strncmp("420mpeg2", tokstart, 8) == 0) {
79 pix_fmt = AV_PIX_FMT_YUV420P;
80 chroma_sample_location = AVCHROMA_LOC_LEFT;
81 } else if (strncmp("420paldv", tokstart, 8) == 0) {
82 pix_fmt = AV_PIX_FMT_YUV420P;
83 chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
84 } else if (strncmp("420p16", tokstart, 6) == 0) {
85 pix_fmt = AV_PIX_FMT_YUV420P16;
86 } else if (strncmp("422p16", tokstart, 6) == 0) {
87 pix_fmt = AV_PIX_FMT_YUV422P16;
88 } else if (strncmp("444p16", tokstart, 6) == 0) {
89 pix_fmt = AV_PIX_FMT_YUV444P16;
90 } else if (strncmp("420p14", tokstart, 6) == 0) {
91 pix_fmt = AV_PIX_FMT_YUV420P14;
92 } else if (strncmp("422p14", tokstart, 6) == 0) {
93 pix_fmt = AV_PIX_FMT_YUV422P14;
94 } else if (strncmp("444p14", tokstart, 6) == 0) {
95 pix_fmt = AV_PIX_FMT_YUV444P14;
96 } else if (strncmp("420p12", tokstart, 6) == 0) {
97 pix_fmt = AV_PIX_FMT_YUV420P12;
98 } else if (strncmp("422p12", tokstart, 6) == 0) {
99 pix_fmt = AV_PIX_FMT_YUV422P12;
100 } else if (strncmp("444p12", tokstart, 6) == 0) {
101 pix_fmt = AV_PIX_FMT_YUV444P12;
102 } else if (strncmp("420p10", tokstart, 6) == 0) {
103 pix_fmt = AV_PIX_FMT_YUV420P10;
104 } else if (strncmp("422p10", tokstart, 6) == 0) {
105 pix_fmt = AV_PIX_FMT_YUV422P10;
106 } else if (strncmp("444p10", tokstart, 6) == 0) {
107 pix_fmt = AV_PIX_FMT_YUV444P10;
108 } else if (strncmp("420p9", tokstart, 5) == 0) {
109 pix_fmt = AV_PIX_FMT_YUV420P9;
110 } else if (strncmp("422p9", tokstart, 5) == 0) {
111 pix_fmt = AV_PIX_FMT_YUV422P9;
112 } else if (strncmp("444p9", tokstart, 5) == 0) {
113 pix_fmt = AV_PIX_FMT_YUV444P9;
114 } else if (strncmp("420", tokstart, 3) == 0) {
115 pix_fmt = AV_PIX_FMT_YUV420P;
116 chroma_sample_location = AVCHROMA_LOC_CENTER;
117 } else if (strncmp("411", tokstart, 3) == 0) {
118 pix_fmt = AV_PIX_FMT_YUV411P;
119 } else if (strncmp("422", tokstart, 3) == 0) {
120 pix_fmt = AV_PIX_FMT_YUV422P;
121 } else if (strncmp("444alpha", tokstart, 8) == 0 ) {
122 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
123 "YUV4MPEG stream.\n");
124 return -1;
125 } else if (strncmp("444", tokstart, 3) == 0) {
126 pix_fmt = AV_PIX_FMT_YUV444P;
127 } else if (strncmp("mono16", tokstart, 6) == 0) {
128 pix_fmt = AV_PIX_FMT_GRAY16;
129 } else if (strncmp("mono", tokstart, 4) == 0) {
130 pix_fmt = AV_PIX_FMT_GRAY8;
131 } else {
132 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
133 "pixel format.\n");
134 return -1;
135 }
136 while (tokstart < header_end && *tokstart != 0x20)
137 tokstart++;
138 break;
139 case 'I': // Interlace type
140 switch (*tokstart++){
141 case '?':
142 field_order = AV_FIELD_UNKNOWN;
143 break;
144 case 'p':
145 field_order = AV_FIELD_PROGRESSIVE;
146 break;
147 case 't':
148 field_order = AV_FIELD_TT;
149 break;
150 case 'b':
151 field_order = AV_FIELD_BB;
152 break;
153 case 'm':
154 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
155 "interlaced and non-interlaced frames.\n");
156 default:
157 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
158 return AVERROR(EINVAL);
159 }
160 break;
161 case 'F': // Frame rate
162 sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
163 while (tokstart < header_end && *tokstart != 0x20)
164 tokstart++;
165 break;
166 case 'A': // Pixel aspect
167 sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
168 while (tokstart < header_end && *tokstart != 0x20)
169 tokstart++;
170 break;
171 case 'X': // Vendor extensions
172 if (strncmp("YSCSS=", tokstart, 6) == 0) {
173 // Older nonstandard pixel format representation
174 tokstart += 6;
175 if (strncmp("420JPEG", tokstart, 7) == 0)
176 alt_pix_fmt = AV_PIX_FMT_YUV420P;
177 else if (strncmp("420MPEG2", tokstart, 8) == 0)
178 alt_pix_fmt = AV_PIX_FMT_YUV420P;
179 else if (strncmp("420PALDV", tokstart, 8) == 0)
180 alt_pix_fmt = AV_PIX_FMT_YUV420P;
181 else if (strncmp("420P9", tokstart, 5) == 0)
182 alt_pix_fmt = AV_PIX_FMT_YUV420P9;
183 else if (strncmp("422P9", tokstart, 5) == 0)
184 alt_pix_fmt = AV_PIX_FMT_YUV422P9;
185 else if (strncmp("444P9", tokstart, 5) == 0)
186 alt_pix_fmt = AV_PIX_FMT_YUV444P9;
187 else if (strncmp("420P10", tokstart, 6) == 0)
188 alt_pix_fmt = AV_PIX_FMT_YUV420P10;
189 else if (strncmp("422P10", tokstart, 6) == 0)
190 alt_pix_fmt = AV_PIX_FMT_YUV422P10;
191 else if (strncmp("444P10", tokstart, 6) == 0)
192 alt_pix_fmt = AV_PIX_FMT_YUV444P10;
193 else if (strncmp("420P12", tokstart, 6) == 0)
194 alt_pix_fmt = AV_PIX_FMT_YUV420P12;
195 else if (strncmp("422P12", tokstart, 6) == 0)
196 alt_pix_fmt = AV_PIX_FMT_YUV422P12;
197 else if (strncmp("444P12", tokstart, 6) == 0)
198 alt_pix_fmt = AV_PIX_FMT_YUV444P12;
199 else if (strncmp("420P14", tokstart, 6) == 0)
200 alt_pix_fmt = AV_PIX_FMT_YUV420P14;
201 else if (strncmp("422P14", tokstart, 6) == 0)
202 alt_pix_fmt = AV_PIX_FMT_YUV422P14;
203 else if (strncmp("444P14", tokstart, 6) == 0)
204 alt_pix_fmt = AV_PIX_FMT_YUV444P14;
205 else if (strncmp("420P16", tokstart, 6) == 0)
206 alt_pix_fmt = AV_PIX_FMT_YUV420P16;
207 else if (strncmp("422P16", tokstart, 6) == 0)
208 alt_pix_fmt = AV_PIX_FMT_YUV422P16;
209 else if (strncmp("444P16", tokstart, 6) == 0)
210 alt_pix_fmt = AV_PIX_FMT_YUV444P16;
211 else if (strncmp("411", tokstart, 3) == 0)
212 alt_pix_fmt = AV_PIX_FMT_YUV411P;
213 else if (strncmp("422", tokstart, 3) == 0)
214 alt_pix_fmt = AV_PIX_FMT_YUV422P;
215 else if (strncmp("444", tokstart, 3) == 0)
216 alt_pix_fmt = AV_PIX_FMT_YUV444P;
217 }
218 while (tokstart < header_end && *tokstart != 0x20)
219 tokstart++;
220 break;
221 }
222 }
223
224 if (width == -1 || height == -1) {
225 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
226 return -1;
227 }
228
229 if (pix_fmt == AV_PIX_FMT_NONE) {
230 if (alt_pix_fmt == AV_PIX_FMT_NONE)
231 pix_fmt = AV_PIX_FMT_YUV420P;
232 else
233 pix_fmt = alt_pix_fmt;
234 }
235
236 if (raten <= 0 || rated <= 0) {
237 // Frame rate unknown
238 raten = 25;
239 rated = 1;
240 }
241
242 if (aspectn == 0 && aspectd == 0) {
243 // Pixel aspect unknown
244 aspectd = 1;
245 }
246
247 st = avformat_new_stream(s, NULL);
248 if (!st)
249 return AVERROR(ENOMEM);
250 st->codecpar->width = width;
251 st->codecpar->height = height;
252 av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
253 avpriv_set_pts_info(st, 64, rated, raten);
254 st->avg_frame_rate = av_inv_q(st->time_base);
255 st->codecpar->format = pix_fmt;
256 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
257 st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
258 st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
259 st->codecpar->chroma_location = chroma_sample_location;
260 st->codecpar->field_order = field_order;
261 s->packet_size = av_image_get_buffer_size(st->codecpar->format, width, height, 1) + Y4M_FRAME_MAGIC_LEN;
262 if ((int) s->packet_size < 0)
263 return s->packet_size;
264 s->internal->data_offset = avio_tell(pb);
265
266 st->duration = (avio_size(pb) - avio_tell(pb)) / s->packet_size;
267
268 return 0;
269}
270
271static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
272{
273 int i;
274 char header[MAX_FRAME_HEADER+1];
275 int ret;
276 int64_t off = avio_tell(s->pb);
277
278 for (i = 0; i < MAX_FRAME_HEADER; i++) {
279 header[i] = avio_r8(s->pb);
280 if (header[i] == '\n') {
281 header[i + 1] = 0;
282 break;
283 }
284 }
285 if (s->pb->error)
286 return s->pb->error;
287 else if (s->pb->eof_reached)
288 return AVERROR_EOF;
289 else if (i == MAX_FRAME_HEADER)
290 return AVERROR_INVALIDDATA;
291
292 if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
293 return AVERROR_INVALIDDATA;
294
295 ret = av_get_packet(s->pb, pkt, s->packet_size - Y4M_FRAME_MAGIC_LEN);
296 if (ret < 0)
297 return ret;
298 else if (ret != s->packet_size - Y4M_FRAME_MAGIC_LEN) {
299 av_packet_unref(pkt);
300 return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
301 }
302 pkt->stream_index = 0;
303 pkt->pts = (off - s->internal->data_offset) / s->packet_size;
304 pkt->duration = 1;
305 return 0;
306}
307
308static int yuv4_read_seek(AVFormatContext *s, int stream_index,
309 int64_t pts, int flags)
310{
311 if (avio_seek(s->pb, pts * s->packet_size + s->internal->data_offset, SEEK_SET) < 0)
312 return -1;
313 return 0;
314}
315
316static int yuv4_probe(AVProbeData *pd)
317{
318 /* check file header */
319 if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
320 return AVPROBE_SCORE_MAX;
321 else
322 return 0;
323}
324
325AVInputFormat ff_yuv4mpegpipe_demuxer = {
326 .name = "yuv4mpegpipe",
327 .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
328 .read_probe = yuv4_probe,
329 .read_header = yuv4_read_header,
330 .read_packet = yuv4_read_packet,
331 .read_seek = yuv4_read_seek,
332 .extensions = "y4m",
333};
334
generated by cgit at 2024-05-17 03:29:51 (GMT)