[deb_ffmpeg.git] / ffmpeg / libavformat / yuv4mpegenc.c

/*
 * YUV4MPEG muxer
 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/pixdesc.h"
#include "avformat.h"
#include "internal.h"
#include "yuv4mpeg.h"

#define Y4M_LINE_MAX 256

static int yuv4_generate_header(AVFormatContext *s, char* buf)
{
    AVStream *st;
    int width, height;
    int raten, rated, aspectn, aspectd, n;
    char inter;
    const char *colorspace = "";

    st     = s->streams[0];
    width  = st->codec->width;
    height = st->codec->height;

    // TODO: should be avg_frame_rate
    av_reduce(&raten, &rated, st->time_base.den,
              st->time_base.num, (1UL << 31) - 1);

    aspectn = st->sample_aspect_ratio.num;
    aspectd = st->sample_aspect_ratio.den;

    if (aspectn == 0 && aspectd == 1)
        aspectd = 0;  // 0:0 means unknown

    switch (st->codec->field_order) {
    case AV_FIELD_TB:
    case AV_FIELD_TT: inter = 't'; break;
    case AV_FIELD_BT:
    case AV_FIELD_BB: inter = 'b'; break;
    default:          inter = 'p'; break;
    }

    switch (st->codec->pix_fmt) {
    case AV_PIX_FMT_GRAY8:
        colorspace = " Cmono";
        break;
    case AV_PIX_FMT_GRAY16:
        colorspace = " Cmono16";
        break;
    case AV_PIX_FMT_YUV411P:
        colorspace = " C411 XYSCSS=411";
        break;
    case AV_PIX_FMT_YUV420P:
        switch (st->codec->chroma_sample_location) {
        case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break;
        case AVCHROMA_LOC_LEFT:    colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break;
        default:                   colorspace = " C420jpeg XYSCSS=420JPEG";   break;
        }
        break;
    case AV_PIX_FMT_YUV422P:
        colorspace = " C422 XYSCSS=422";
        break;
    case AV_PIX_FMT_YUV444P:
        colorspace = " C444 XYSCSS=444";
        break;
    case AV_PIX_FMT_YUV420P9:
        colorspace = " C420p9 XYSCSS=420P9";
        break;
    case AV_PIX_FMT_YUV422P9:
        colorspace = " C422p9 XYSCSS=422P9";
        break;
    case AV_PIX_FMT_YUV444P9:
        colorspace = " C444p9 XYSCSS=444P9";
        break;
    case AV_PIX_FMT_YUV420P10:
        colorspace = " C420p10 XYSCSS=420P10";
        break;
    case AV_PIX_FMT_YUV422P10:
        colorspace = " C422p10 XYSCSS=422P10";
        break;
    case AV_PIX_FMT_YUV444P10:
        colorspace = " C444p10 XYSCSS=444P10";
        break;
    case AV_PIX_FMT_YUV420P12:
        colorspace = " C420p12 XYSCSS=420P12";
        break;
    case AV_PIX_FMT_YUV422P12:
        colorspace = " C422p12 XYSCSS=422P12";
        break;
    case AV_PIX_FMT_YUV444P12:
        colorspace = " C444p12 XYSCSS=444P12";
        break;
    case AV_PIX_FMT_YUV420P14:
        colorspace = " C420p14 XYSCSS=420P14";
        break;
    case AV_PIX_FMT_YUV422P14:
        colorspace = " C422p14 XYSCSS=422P14";
        break;
    case AV_PIX_FMT_YUV444P14:
        colorspace = " C444p14 XYSCSS=444P14";
        break;
    case AV_PIX_FMT_YUV420P16:
        colorspace = " C420p16 XYSCSS=420P16";
        break;
    case AV_PIX_FMT_YUV422P16:
        colorspace = " C422p16 XYSCSS=422P16";
        break;
    case AV_PIX_FMT_YUV444P16:
        colorspace = " C444p16 XYSCSS=444P16";
        break;
    }

    /* construct stream header, if this is the first frame */
    n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
                 Y4M_MAGIC, width, height, raten, rated, inter,
                 aspectn, aspectd, colorspace);

    return n;
}

static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVStream *st = s->streams[pkt->stream_index];
    AVIOContext *pb = s->pb;
    AVPicture *picture, picture_tmp;
    int* first_pkt = s->priv_data;
    int width, height, h_chroma_shift, v_chroma_shift;
    int i;
    char buf2[Y4M_LINE_MAX + 1];
    char buf1[20];
    uint8_t *ptr, *ptr1, *ptr2;

    memcpy(&picture_tmp, pkt->data, sizeof(AVPicture));
    picture = &picture_tmp;

    /* for the first packet we have to output the header as well */
    if (*first_pkt) {
        *first_pkt = 0;
        if (yuv4_generate_header(s, buf2) < 0) {
            av_log(s, AV_LOG_ERROR,
                   "Error. YUV4MPEG stream header write failed.\n");
            return AVERROR(EIO);
        } else {
            avio_write(pb, buf2, strlen(buf2));
        }
    }

    /* construct frame header */

    snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
    avio_write(pb, buf1, strlen(buf1));

    width  = st->codec->width;
    height = st->codec->height;

    ptr = picture->data[0];

    switch (st->codec->pix_fmt) {
    case AV_PIX_FMT_GRAY8:
    case AV_PIX_FMT_YUV411P:
    case AV_PIX_FMT_YUV420P:
    case AV_PIX_FMT_YUV422P:
    case AV_PIX_FMT_YUV444P:
        break;
    case AV_PIX_FMT_GRAY16:
    case AV_PIX_FMT_YUV420P9:
    case AV_PIX_FMT_YUV422P9:
    case AV_PIX_FMT_YUV444P9:
    case AV_PIX_FMT_YUV420P10:
    case AV_PIX_FMT_YUV422P10:
    case AV_PIX_FMT_YUV444P10:
    case AV_PIX_FMT_YUV420P12:
    case AV_PIX_FMT_YUV422P12:
    case AV_PIX_FMT_YUV444P12:
    case AV_PIX_FMT_YUV420P14:
    case AV_PIX_FMT_YUV422P14:
    case AV_PIX_FMT_YUV444P14:
    case AV_PIX_FMT_YUV420P16:
    case AV_PIX_FMT_YUV422P16:
    case AV_PIX_FMT_YUV444P16:
        width *= 2;
        break;
    default:
        av_log(s, AV_LOG_ERROR, "The pixel format '%s' is not supported.\n",
               av_get_pix_fmt_name(st->codec->pix_fmt));
        return AVERROR(EINVAL);
    }

    for (i = 0; i < height; i++) {
        avio_write(pb, ptr, width);
        ptr += picture->linesize[0];
    }

    if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8 &&
        st->codec->pix_fmt != AV_PIX_FMT_GRAY16) {
        // Adjust for smaller Cb and Cr planes
        av_pix_fmt_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
                                         &v_chroma_shift);
        width  = FF_CEIL_RSHIFT(width,  h_chroma_shift);
        height = FF_CEIL_RSHIFT(height, v_chroma_shift);

        ptr1 = picture->data[1];
        ptr2 = picture->data[2];
        for (i = 0; i < height; i++) {     /* Cb */
            avio_write(pb, ptr1, width);
            ptr1 += picture->linesize[1];
        }
        for (i = 0; i < height; i++) {     /* Cr */
            avio_write(pb, ptr2, width);
            ptr2 += picture->linesize[2];
        }
    }

    return 0;
}

static int yuv4_write_header(AVFormatContext *s)
{
    int *first_pkt = s->priv_data;

    if (s->nb_streams != 1)
        return AVERROR(EIO);

    if (s->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
        av_log(s, AV_LOG_ERROR, "ERROR: Only rawvideo supported.\n");
        return AVERROR_INVALIDDATA;
    }

    switch (s->streams[0]->codec->pix_fmt) {
    case AV_PIX_FMT_YUV411P:
        av_log(s, AV_LOG_WARNING, "Warning: generating rarely used 4:1:1 YUV "
               "stream, some mjpegtools might not work.\n");
        break;
    case AV_PIX_FMT_GRAY8:
    case AV_PIX_FMT_GRAY16:
    case AV_PIX_FMT_YUV420P:
    case AV_PIX_FMT_YUV422P:
    case AV_PIX_FMT_YUV444P:
        break;
    case AV_PIX_FMT_YUV420P9:
    case AV_PIX_FMT_YUV422P9:
    case AV_PIX_FMT_YUV444P9:
    case AV_PIX_FMT_YUV420P10:
    case AV_PIX_FMT_YUV422P10:
    case AV_PIX_FMT_YUV444P10:
    case AV_PIX_FMT_YUV420P12:
    case AV_PIX_FMT_YUV422P12:
    case AV_PIX_FMT_YUV444P12:
    case AV_PIX_FMT_YUV420P14:
    case AV_PIX_FMT_YUV422P14:
    case AV_PIX_FMT_YUV444P14:
    case AV_PIX_FMT_YUV420P16:
    case AV_PIX_FMT_YUV422P16:
    case AV_PIX_FMT_YUV444P16:
        if (s->streams[0]->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL) {
            av_log(s, AV_LOG_ERROR, "'%s' is not a official yuv4mpegpipe pixel format. "
                   "Use '-strict -1' to encode to this pixel format.\n",
                   av_get_pix_fmt_name(s->streams[0]->codec->pix_fmt));
            return AVERROR(EINVAL);
        }
        av_log(s, AV_LOG_WARNING, "Warning: generating non standard YUV stream. "
               "Mjpegtools will not work.\n");
        break;
    default:
        av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg can only handle "
               "yuv444p, yuv422p, yuv420p, yuv411p and gray8 pixel formats. "
               "And using 'strict -1' also yuv444p9, yuv422p9, yuv420p9, "
               "yuv444p10, yuv422p10, yuv420p10, "
               "yuv444p12, yuv422p12, yuv420p12, "
               "yuv444p14, yuv422p14, yuv420p14, "
               "yuv444p16, yuv422p16, yuv420p16 "
               "and gray16 pixel formats. "
               "Use -pix_fmt to select one.\n");
        return AVERROR(EIO);
    }

    *first_pkt = 1;
    return 0;
}

AVOutputFormat ff_yuv4mpegpipe_muxer = {
    .name              = "yuv4mpegpipe",
    .long_name         = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
    .extensions        = "y4m",
    .priv_data_size    = sizeof(int),
    .audio_codec       = AV_CODEC_ID_NONE,
    .video_codec       = AV_CODEC_ID_RAWVIDEO,
    .write_header      = yuv4_write_header,
    .write_packet      = yuv4_write_packet,
    .flags             = AVFMT_RAWPICTURE,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* YUV4MPEG muxer
	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/pixdesc.h"
	23	#include "avformat.h"
	24	#include "internal.h"
	25	#include "yuv4mpeg.h"
	26
	27	#define Y4M_LINE_MAX 256
	28
	29	static int yuv4_generate_header(AVFormatContext s, char buf)
	30	{
	31	AVStream *st;
	32	int width, height;
	33	int raten, rated, aspectn, aspectd, n;
	34	char inter;
	35	const char *colorspace = "";
	36
	37	st = s->streams[0];
	38	width = st->codec->width;
	39	height = st->codec->height;
	40
	41	// TODO: should be avg_frame_rate
	42	av_reduce(&raten, &rated, st->time_base.den,
	43	st->time_base.num, (1UL << 31) - 1);
	44
	45	aspectn = st->sample_aspect_ratio.num;
	46	aspectd = st->sample_aspect_ratio.den;
	47
	48	if (aspectn == 0 && aspectd == 1)
	49	aspectd = 0; // 0:0 means unknown
	50
	51	switch (st->codec->field_order) {
	52	case AV_FIELD_TB:
	53	case AV_FIELD_TT: inter = 't'; break;
	54	case AV_FIELD_BT:
	55	case AV_FIELD_BB: inter = 'b'; break;
	56	default: inter = 'p'; break;
	57	}
	58
	59	switch (st->codec->pix_fmt) {
	60	case AV_PIX_FMT_GRAY8:
	61	colorspace = " Cmono";
	62	break;
	63	case AV_PIX_FMT_GRAY16:
	64	colorspace = " Cmono16";
65	break;
66	case AV_PIX_FMT_YUV411P:
67	colorspace = " C411 XYSCSS=411";
68	break;
69	case AV_PIX_FMT_YUV420P:
70	switch (st->codec->chroma_sample_location) {
71	case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break;
72	case AVCHROMA_LOC_LEFT: colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break;
73	default: colorspace = " C420jpeg XYSCSS=420JPEG"; break;
74	}
75	break;
76	case AV_PIX_FMT_YUV422P:
77	colorspace = " C422 XYSCSS=422";
78	break;
79	case AV_PIX_FMT_YUV444P:
80	colorspace = " C444 XYSCSS=444";
81	break;
82	case AV_PIX_FMT_YUV420P9:
83	colorspace = " C420p9 XYSCSS=420P9";
84	break;
85	case AV_PIX_FMT_YUV422P9:
86	colorspace = " C422p9 XYSCSS=422P9";
87	break;
88	case AV_PIX_FMT_YUV444P9:
89	colorspace = " C444p9 XYSCSS=444P9";
90	break;
91	case AV_PIX_FMT_YUV420P10:
92	colorspace = " C420p10 XYSCSS=420P10";
93	break;
94	case AV_PIX_FMT_YUV422P10:
95	colorspace = " C422p10 XYSCSS=422P10";
96	break;
97	case AV_PIX_FMT_YUV444P10:
98	colorspace = " C444p10 XYSCSS=444P10";
99	break;
100	case AV_PIX_FMT_YUV420P12:
101	colorspace = " C420p12 XYSCSS=420P12";
102	break;
103	case AV_PIX_FMT_YUV422P12:
104	colorspace = " C422p12 XYSCSS=422P12";
105	break;
106	case AV_PIX_FMT_YUV444P12:
107	colorspace = " C444p12 XYSCSS=444P12";
108	break;
109	case AV_PIX_FMT_YUV420P14:
110	colorspace = " C420p14 XYSCSS=420P14";
111	break;
112	case AV_PIX_FMT_YUV422P14:
113	colorspace = " C422p14 XYSCSS=422P14";
114	break;
115	case AV_PIX_FMT_YUV444P14:
116	colorspace = " C444p14 XYSCSS=444P14";
117	break;
118	case AV_PIX_FMT_YUV420P16:
119	colorspace = " C420p16 XYSCSS=420P16";
120	break;
121	case AV_PIX_FMT_YUV422P16:
122	colorspace = " C422p16 XYSCSS=422P16";
123	break;
124	case AV_PIX_FMT_YUV444P16:
125	colorspace = " C444p16 XYSCSS=444P16";
126	break;
127	}
128
129	/* construct stream header, if this is the first frame */
130	n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
131	Y4M_MAGIC, width, height, raten, rated, inter,
132	aspectn, aspectd, colorspace);
133
134	return n;
135	}
136
137	static int yuv4_write_packet(AVFormatContext s, AVPacket pkt)
138	{
139	AVStream *st = s->streams[pkt->stream_index];
140	AVIOContext *pb = s->pb;
141	AVPicture *picture, picture_tmp;
142	int* first_pkt = s->priv_data;
143	int width, height, h_chroma_shift, v_chroma_shift;
144	int i;
145	char buf2[Y4M_LINE_MAX + 1];
146	char buf1[20];
147	uint8_t ptr, ptr1, *ptr2;
148
149	memcpy(&picture_tmp, pkt->data, sizeof(AVPicture));
150	picture = &picture_tmp;
151
152	/* for the first packet we have to output the header as well */
153	if (*first_pkt) {
154	*first_pkt = 0;
155	if (yuv4_generate_header(s, buf2) < 0) {
156	av_log(s, AV_LOG_ERROR,
157	"Error. YUV4MPEG stream header write failed.\n");
158	return AVERROR(EIO);
159	} else {
160	avio_write(pb, buf2, strlen(buf2));
161	}
162	}
163
164	/* construct frame header */
165
166	snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
167	avio_write(pb, buf1, strlen(buf1));
168
169	width = st->codec->width;
170	height = st->codec->height;
171
172	ptr = picture->data[0];
173
174	switch (st->codec->pix_fmt) {
175	case AV_PIX_FMT_GRAY8:
176	case AV_PIX_FMT_YUV411P:
177	case AV_PIX_FMT_YUV420P:
178	case AV_PIX_FMT_YUV422P:
179	case AV_PIX_FMT_YUV444P:
180	break;
181	case AV_PIX_FMT_GRAY16:
182	case AV_PIX_FMT_YUV420P9:
183	case AV_PIX_FMT_YUV422P9:
184	case AV_PIX_FMT_YUV444P9:
185	case AV_PIX_FMT_YUV420P10:
186	case AV_PIX_FMT_YUV422P10:
187	case AV_PIX_FMT_YUV444P10:
188	case AV_PIX_FMT_YUV420P12:
189	case AV_PIX_FMT_YUV422P12:
190	case AV_PIX_FMT_YUV444P12:
191	case AV_PIX_FMT_YUV420P14:
192	case AV_PIX_FMT_YUV422P14:
193	case AV_PIX_FMT_YUV444P14:
194	case AV_PIX_FMT_YUV420P16:
195	case AV_PIX_FMT_YUV422P16:
196	case AV_PIX_FMT_YUV444P16:
197	width *= 2;
198	break;
199	default:
200	av_log(s, AV_LOG_ERROR, "The pixel format '%s' is not supported.\n",
201	av_get_pix_fmt_name(st->codec->pix_fmt));
202	return AVERROR(EINVAL);
203	}
204
205	for (i = 0; i < height; i++) {
206	avio_write(pb, ptr, width);
207	ptr += picture->linesize[0];
208	}
209
210	if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8 &&
211	st->codec->pix_fmt != AV_PIX_FMT_GRAY16) {
212	// Adjust for smaller Cb and Cr planes
213	av_pix_fmt_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
214	&v_chroma_shift);
215	width = FF_CEIL_RSHIFT(width, h_chroma_shift);
216	height = FF_CEIL_RSHIFT(height, v_chroma_shift);
217
218	ptr1 = picture->data[1];
219	ptr2 = picture->data[2];
220	for (i = 0; i < height; i++) { /* Cb */
221	avio_write(pb, ptr1, width);
222	ptr1 += picture->linesize[1];
223	}
224	for (i = 0; i < height; i++) { /* Cr */
225	avio_write(pb, ptr2, width);
226	ptr2 += picture->linesize[2];
227	}
228	}
229
230	return 0;
231	}
232
233	static int yuv4_write_header(AVFormatContext *s)
234	{
235	int *first_pkt = s->priv_data;
236
237	if (s->nb_streams != 1)
238	return AVERROR(EIO);
239
240	if (s->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
241	av_log(s, AV_LOG_ERROR, "ERROR: Only rawvideo supported.\n");
242	return AVERROR_INVALIDDATA;
243	}
244
245	switch (s->streams[0]->codec->pix_fmt) {
246	case AV_PIX_FMT_YUV411P:
247	av_log(s, AV_LOG_WARNING, "Warning: generating rarely used 4:1:1 YUV "
248	"stream, some mjpegtools might not work.\n");
249	break;
250	case AV_PIX_FMT_GRAY8:
251	case AV_PIX_FMT_GRAY16:
252	case AV_PIX_FMT_YUV420P:
253	case AV_PIX_FMT_YUV422P:
254	case AV_PIX_FMT_YUV444P:
255	break;
256	case AV_PIX_FMT_YUV420P9:
257	case AV_PIX_FMT_YUV422P9:
258	case AV_PIX_FMT_YUV444P9:
259	case AV_PIX_FMT_YUV420P10:
260	case AV_PIX_FMT_YUV422P10:
261	case AV_PIX_FMT_YUV444P10:
262	case AV_PIX_FMT_YUV420P12:
263	case AV_PIX_FMT_YUV422P12:
264	case AV_PIX_FMT_YUV444P12:
265	case AV_PIX_FMT_YUV420P14:
266	case AV_PIX_FMT_YUV422P14:
267	case AV_PIX_FMT_YUV444P14:
268	case AV_PIX_FMT_YUV420P16:
269	case AV_PIX_FMT_YUV422P16:
270	case AV_PIX_FMT_YUV444P16:
271	if (s->streams[0]->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL) {
272	av_log(s, AV_LOG_ERROR, "'%s' is not a official yuv4mpegpipe pixel format. "
273	"Use '-strict -1' to encode to this pixel format.\n",
274	av_get_pix_fmt_name(s->streams[0]->codec->pix_fmt));
275	return AVERROR(EINVAL);
276	}
277	av_log(s, AV_LOG_WARNING, "Warning: generating non standard YUV stream. "
278	"Mjpegtools will not work.\n");
279	break;
280	default:
281	av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg can only handle "
282	"yuv444p, yuv422p, yuv420p, yuv411p and gray8 pixel formats. "
283	"And using 'strict -1' also yuv444p9, yuv422p9, yuv420p9, "
284	"yuv444p10, yuv422p10, yuv420p10, "
285	"yuv444p12, yuv422p12, yuv420p12, "
286	"yuv444p14, yuv422p14, yuv420p14, "
287	"yuv444p16, yuv422p16, yuv420p16 "
288	"and gray16 pixel formats. "
289	"Use -pix_fmt to select one.\n");
290	return AVERROR(EIO);
291	}
292
293	*first_pkt = 1;
294	return 0;
295	}
296
297	AVOutputFormat ff_yuv4mpegpipe_muxer = {
298	.name = "yuv4mpegpipe",
299	.long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
300	.extensions = "y4m",
301	.priv_data_size = sizeof(int),
302	.audio_codec = AV_CODEC_ID_NONE,
303	.video_codec = AV_CODEC_ID_RAWVIDEO,
304	.write_header = yuv4_write_header,
305	.write_packet = yuv4_write_packet,
306	.flags = AVFMT_RAWPICTURE,
307	};