Merge commit 'e4dc1000d7bbbcb5b45cf9849fc5315f19578e37'

* commit 'e4dc1000d7bbbcb5b45cf9849fc5315f19578e37':
  yuv4mpeg: split the demuxer and muxer into separate files

Conflicts:
	libavformat/yuv4mpegdec.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/Makefile

@@ -431,8 +431,8 @@ OBJS-$(CONFIG_XBIN_DEMUXER)              += bintext.o sauce.o
 OBJS-$(CONFIG_XMV_DEMUXER)               += xmv.o
 OBJS-$(CONFIG_XWMA_DEMUXER)              += xwma.o
 OBJS-$(CONFIG_YOP_DEMUXER)               += yop.o
-OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER)        += yuv4mpeg.o
-OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER)      += yuv4mpeg.o
+OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER)        += yuv4mpegenc.o
+OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER)      += yuv4mpegdec.o
 
 # external libraries
 OBJS-$(CONFIG_LIBGME_DEMUXER)            += libgme.o

libavformat/yuv4mpeg.h

@@ -0,0 +1,27 @@
+/*
+ * YUV4MPEG common definitions
+ *
+ * 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
+ */
+
+#ifndef AVFORMAT_YUV4MPEG_H
+#define AVFORMAT_YUV4MPEG_H
+
+#define Y4M_MAGIC "YUV4MPEG2"
+#define Y4M_FRAME_MAGIC "FRAME"
+
+#endif /* AVFORMAT_YUV4MPEG_H */

libavformat/yuv4mpeg.c → libavformat/yuv4mpegdec.c

@@ -1,5 +1,5 @@
 /*
- * YUV4MPEG format
+ * YUV4MPEG demuxer
  * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
  *
  * This file is part of FFmpeg.
@@ -19,297 +19,9 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "libavutil/pixdesc.h"
 #include "avformat.h"
 #include "internal.h"
-
-#define Y4M_MAGIC "YUV4MPEG2"
-#define Y4M_FRAME_MAGIC "FRAME"
-#define Y4M_LINE_MAX 256
-
-#if CONFIG_YUV4MPEGPIPE_MUXER
-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;
-
-    av_reduce(&raten, &rated, st->codec->time_base.den,
-              st->codec->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
-
-    inter = 'p'; /* progressive is the default */
-    if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame)
-        inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
-    if (st->codec->field_order == AV_FIELD_PROGRESSIVE) {
-        inter = 'p';
-    } else if (st->codec->field_order == AV_FIELD_TB || st->codec->field_order == AV_FIELD_TT) {
-        inter = 't';
-    } else if (st->codec->field_order == AV_FIELD_BT || st->codec->field_order == AV_FIELD_BB) {
-        inter = 'b';
-    }
-
-    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,
-};
-#endif
+#include "yuv4mpeg.h"
 
 /* Header size increased to allow room for optional flags */
 #define MAX_YUV4_HEADER 80
@@ -598,7 +310,6 @@ static int yuv4_probe(AVProbeData *pd)
         return 0;
 }
 
-#if CONFIG_YUV4MPEGPIPE_DEMUXER
 AVInputFormat ff_yuv4mpegpipe_demuxer = {
     .name           = "yuv4mpegpipe",
     .long_name      = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
@@ -607,4 +318,3 @@ AVInputFormat ff_yuv4mpegpipe_demuxer = {
     .read_packet    = yuv4_read_packet,
     .extensions     = "y4m",
 };
-#endif

libavformat/yuv4mpegenc.c

@@ -0,0 +1,309 @@
+/*
+ * 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;
+
+    av_reduce(&raten, &rated, st->codec->time_base.den,
+              st->codec->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
+
+    inter = 'p'; /* progressive is the default */
+    if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame)
+        inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
+    if (st->codec->field_order == AV_FIELD_PROGRESSIVE) {
+        inter = 'p';
+    } else if (st->codec->field_order == AV_FIELD_TB || st->codec->field_order == AV_FIELD_TT) {
+        inter = 't';
+    } else if (st->codec->field_order == AV_FIELD_BT || st->codec->field_order == AV_FIELD_BB) {
+        inter = 'b';
+    }
+
+    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,
+};