1/*
2 * YUV4MPEG format
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#include "avformat.h"
22
23#define Y4M_MAGIC "YUV4MPEG2"
24#define Y4M_FRAME_MAGIC "FRAME"
25#define Y4M_LINE_MAX 256
26
27struct frame_attributes {
28    int interlaced_frame;
29    int top_field_first;
30};
31
32#if CONFIG_YUV4MPEGPIPE_MUXER
33static int yuv4_generate_header(AVFormatContext *s, char* buf)
34{
35    AVStream *st;
36    int width, height;
37    int raten, rated, aspectn, aspectd, n;
38    char inter;
39    const char *colorspace = "";
40
41    st = s->streams[0];
42    width = st->codec->width;
43    height = st->codec->height;
44
45    av_reduce(&raten, &rated, st->codec->time_base.den, st->codec->time_base.num, (1UL<<31)-1);
46
47    aspectn = st->sample_aspect_ratio.num;
48    aspectd = st->sample_aspect_ratio.den;
49
50    if ( aspectn == 0 && aspectd == 1 ) aspectd = 0;  // 0:0 means unknown
51
52    inter = 'p'; /* progressive is the default */
53    if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame) {
54        inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
55    }
56
57    switch(st->codec->pix_fmt) {
58    case PIX_FMT_GRAY8:
59        colorspace = " Cmono";
60        break;
61    case PIX_FMT_YUV411P:
62        colorspace = " C411 XYSCSS=411";
63        break;
64    case PIX_FMT_YUV420P:
65        colorspace = (st->codec->codec_id == CODEC_ID_DVVIDEO)?" C420paldv XYSCSS=420PALDV":" C420mpeg2 XYSCSS=420MPEG2";
66        break;
67    case PIX_FMT_YUV422P:
68        colorspace = " C422 XYSCSS=422";
69        break;
70    case PIX_FMT_YUV444P:
71        colorspace = " C444 XYSCSS=444";
72        break;
73    }
74
75    /* construct stream header, if this is the first frame */
76    n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
77                 Y4M_MAGIC,
78                 width,
79                 height,
80                 raten, rated,
81                 inter,
82                 aspectn, aspectd,
83                 colorspace);
84
85    return n;
86}
87
88static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
89{
90    AVStream *st = s->streams[pkt->stream_index];
91    ByteIOContext *pb = s->pb;
92    AVPicture *picture;
93    int* first_pkt = s->priv_data;
94    int width, height, h_chroma_shift, v_chroma_shift;
95    int i, m;
96    char buf2[Y4M_LINE_MAX+1];
97    char buf1[20];
98    uint8_t *ptr, *ptr1, *ptr2;
99
100    picture = (AVPicture *)pkt->data;
101
102    /* for the first packet we have to output the header as well */
103    if (*first_pkt) {
104        *first_pkt = 0;
105        if (yuv4_generate_header(s, buf2) < 0) {
106            av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
107            return AVERROR(EIO);
108        } else {
109            put_buffer(pb, buf2, strlen(buf2));
110        }
111    }
112
113    /* construct frame header */
114
115    m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
116    put_buffer(pb, buf1, strlen(buf1));
117
118    width = st->codec->width;
119    height = st->codec->height;
120
121    ptr = picture->data[0];
122    for(i=0;i<height;i++) {
123        put_buffer(pb, ptr, width);
124        ptr += picture->linesize[0];
125    }
126
127    if (st->codec->pix_fmt != PIX_FMT_GRAY8){
128    // Adjust for smaller Cb and Cr planes
129    avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift, &v_chroma_shift);
130    width >>= h_chroma_shift;
131    height >>= v_chroma_shift;
132
133    ptr1 = picture->data[1];
134    ptr2 = picture->data[2];
135    for(i=0;i<height;i++) {     /* Cb */
136        put_buffer(pb, ptr1, width);
137        ptr1 += picture->linesize[1];
138    }
139    for(i=0;i<height;i++) {     /* Cr */
140        put_buffer(pb, ptr2, width);
141            ptr2 += picture->linesize[2];
142    }
143    }
144    put_flush_packet(pb);
145    return 0;
146}
147
148static int yuv4_write_header(AVFormatContext *s)
149{
150    int* first_pkt = s->priv_data;
151
152    if (s->nb_streams != 1)
153        return AVERROR(EIO);
154
155    if (s->streams[0]->codec->pix_fmt == PIX_FMT_YUV411P) {
156        av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV stream, some mjpegtools might not work.\n");
157    }
158    else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
159             (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
160             (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
161             (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
162        av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, yuv422p, yuv420p, yuv411p and gray pixel formats. Use -pix_fmt to select one.\n");
163        return AVERROR(EIO);
164    }
165
166    *first_pkt = 1;
167    return 0;
168}
169
170AVOutputFormat yuv4mpegpipe_muxer = {
171    "yuv4mpegpipe",
172    NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
173    "",
174    "y4m",
175    sizeof(int),
176    CODEC_ID_NONE,
177    CODEC_ID_RAWVIDEO,
178    yuv4_write_header,
179    yuv4_write_packet,
180    .flags = AVFMT_RAWPICTURE,
181};
182#endif
183
184/* Header size increased to allow room for optional flags */
185#define MAX_YUV4_HEADER 80
186#define MAX_FRAME_HEADER 80
187
188static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
189{
190    char header[MAX_YUV4_HEADER+10];  // Include headroom for the longest option
191    char *tokstart,*tokend,*header_end;
192    int i;
193    ByteIOContext *pb = s->pb;
194    int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
195    enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
196    AVStream *st;
197    struct frame_attributes *s1 = s->priv_data;
198
199    for (i=0; i<MAX_YUV4_HEADER; i++) {
200        header[i] = get_byte(pb);
201        if (header[i] == '\n') {
202            header[i+1] = 0x20;  // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
203            header[i+2] = 0;
204            break;
205        }
206    }
207    if (i == MAX_YUV4_HEADER) return -1;
208    if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
209
210    s1->interlaced_frame = 0;
211    s1->top_field_first = 0;
212    header_end = &header[i+1]; // Include space
213    for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
214        if (*tokstart==0x20) continue;
215        switch (*tokstart++) {
216        case 'W': // Width. Required.
217            width = strtol(tokstart, &tokend, 10);
218            tokstart=tokend;
219            break;
220        case 'H': // Height. Required.
221            height = strtol(tokstart, &tokend, 10);
222            tokstart=tokend;
223            break;
224        case 'C': // Color space
225            if (strncmp("420jpeg",tokstart,7)==0)
226                pix_fmt = PIX_FMT_YUV420P;
227            else if (strncmp("420mpeg2",tokstart,8)==0)
228                pix_fmt = PIX_FMT_YUV420P;
229            else if (strncmp("420paldv", tokstart, 8)==0)
230                pix_fmt = PIX_FMT_YUV420P;
231            else if (strncmp("411", tokstart, 3)==0)
232                pix_fmt = PIX_FMT_YUV411P;
233            else if (strncmp("422", tokstart, 3)==0)
234                pix_fmt = PIX_FMT_YUV422P;
235            else if (strncmp("444alpha", tokstart, 8)==0) {
236                av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
237                return -1;
238            } else if (strncmp("444", tokstart, 3)==0)
239                pix_fmt = PIX_FMT_YUV444P;
240            else if (strncmp("mono",tokstart, 4)==0) {
241                pix_fmt = PIX_FMT_GRAY8;
242            } else {
243                av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
244                return -1;
245            }
246            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
247            break;
248        case 'I': // Interlace type
249            switch (*tokstart++){
250            case '?':
251                break;
252            case 'p':
253                s1->interlaced_frame=0;
254                break;
255            case 't':
256                s1->interlaced_frame=1;
257                s1->top_field_first=1;
258                break;
259            case 'b':
260                s1->interlaced_frame=1;
261                s1->top_field_first=0;
262                break;
263            case 'm':
264                av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
265                return -1;
266            default:
267                av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
268                return -1;
269            }
270            break;
271        case 'F': // Frame rate
272            sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
273            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
274            break;
275        case 'A': // Pixel aspect
276            sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
277            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
278            break;
279        case 'X': // Vendor extensions
280            if (strncmp("YSCSS=",tokstart,6)==0) {
281                // Older nonstandard pixel format representation
282                tokstart+=6;
283                if (strncmp("420JPEG",tokstart,7)==0)
284                    alt_pix_fmt=PIX_FMT_YUV420P;
285                else if (strncmp("420MPEG2",tokstart,8)==0)
286                    alt_pix_fmt=PIX_FMT_YUV420P;
287                else if (strncmp("420PALDV",tokstart,8)==0)
288                    alt_pix_fmt=PIX_FMT_YUV420P;
289                else if (strncmp("411",tokstart,3)==0)
290                    alt_pix_fmt=PIX_FMT_YUV411P;
291                else if (strncmp("422",tokstart,3)==0)
292                    alt_pix_fmt=PIX_FMT_YUV422P;
293                else if (strncmp("444",tokstart,3)==0)
294                    alt_pix_fmt=PIX_FMT_YUV444P;
295            }
296            while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
297            break;
298        }
299    }
300
301    if ((width == -1) || (height == -1)) {
302        av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
303        return -1;
304    }
305
306    if (pix_fmt == PIX_FMT_NONE) {
307        if (alt_pix_fmt == PIX_FMT_NONE)
308            pix_fmt = PIX_FMT_YUV420P;
309        else
310            pix_fmt = alt_pix_fmt;
311    }
312
313    if (raten == 0 && rated == 0) {
314        // Frame rate unknown
315        raten = 25;
316        rated = 1;
317    }
318
319    if (aspectn == 0 && aspectd == 0) {
320        // Pixel aspect unknown
321        aspectd = 1;
322    }
323
324    st = av_new_stream(s, 0);
325    if(!st)
326        return AVERROR(ENOMEM);
327    st->codec->width = width;
328    st->codec->height = height;
329    av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
330    av_set_pts_info(st, 64, rated, raten);
331    st->codec->pix_fmt = pix_fmt;
332    st->codec->codec_type = CODEC_TYPE_VIDEO;
333    st->codec->codec_id = CODEC_ID_RAWVIDEO;
334    st->sample_aspect_ratio= (AVRational){aspectn, aspectd};
335
336    return 0;
337}
338
339static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
340{
341    int i;
342    char header[MAX_FRAME_HEADER+1];
343    int packet_size, width, height;
344    AVStream *st = s->streams[0];
345    struct frame_attributes *s1 = s->priv_data;
346
347    for (i=0; i<MAX_FRAME_HEADER; i++) {
348        header[i] = get_byte(s->pb);
349        if (header[i] == '\n') {
350            header[i+1] = 0;
351            break;
352        }
353    }
354    if (i == MAX_FRAME_HEADER) return -1;
355    if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
356
357    width = st->codec->width;
358    height = st->codec->height;
359
360    packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
361    if (packet_size < 0)
362        return -1;
363
364    if (av_get_packet(s->pb, pkt, packet_size) != packet_size)
365        return AVERROR(EIO);
366
367    if (s->streams[0]->codec->coded_frame) {
368        s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
369        s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
370    }
371
372    pkt->stream_index = 0;
373    return 0;
374}
375
376static int yuv4_probe(AVProbeData *pd)
377{
378    /* check file header */
379    if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
380        return AVPROBE_SCORE_MAX;
381    else
382        return 0;
383}
384
385#if CONFIG_YUV4MPEGPIPE_DEMUXER
386AVInputFormat yuv4mpegpipe_demuxer = {
387    "yuv4mpegpipe",
388    NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"),
389    sizeof(struct frame_attributes),
390    yuv4_probe,
391    yuv4_read_header,
392    yuv4_read_packet,
393    .extensions = "y4m"
394};
395#endif
396