ff_end_tag: assert that the start is aligned.
[ffmpeg.git] / libavformat / yuv4mpeg.c
index 25eef07..f34a4af 100644 (file)
 /*
  * YUV4MPEG format
- * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
+ * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
  *
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 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 "libavutil/pixdesc.h"
 
 #define Y4M_MAGIC "YUV4MPEG2"
 #define Y4M_FRAME_MAGIC "FRAME"
 #define Y4M_LINE_MAX 256
 
-#ifdef CONFIG_ENCODERS
-
+#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;
 
-    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
 
-    av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
-    
-    aspectn = st->codec.sample_aspect_ratio.num;
-    aspectd = st->codec.sample_aspect_ratio.den;
-    
     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->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,
-                (st->codec.pix_fmt == PIX_FMT_YUV411P) ? " XYSCSS=411" : "");
-                
+                 Y4M_MAGIC, width, height, raten, rated, inter,
+                 aspectn, aspectd, colorspace);
+
     return n;
 }
 
-static int yuv4_write_packet(AVFormatContext *s, int stream_index,
-                             const uint8_t *buf, int size, int64_t pts)
+static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
-    AVStream *st = s->streams[stream_index];
-    ByteIOContext *pb = &s->pb;
-    AVPicture *picture;
+    AVStream *st = s->streams[pkt->stream_index];
+    AVIOContext *pb = s->pb;
+    AVPicture *picture, picture_tmp;
     int* first_pkt = s->priv_data;
-    int width, height;
-    int i, m;
-    char buf2[Y4M_LINE_MAX+1];
+    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;
 
-    picture = (AVPicture *)buf;
+    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) {
-           fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
-           return -EIO;
-       } else {
-           put_buffer(pb, buf2, strlen(buf2)); 
-       }
+        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 */
-    
-    m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
-    put_buffer(pb, buf1, strlen(buf1));
 
-    width = st->codec.width;
-    height = st->codec.height;
-    
+    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];
-    for(i=0;i<height;i++) {
-        put_buffer(pb, ptr, width);
-        ptr += picture->linesize[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);
     }
 
-    height >>= 1;
-    width >>= 1;
-    ptr1 = picture->data[1];
-    ptr2 = picture->data[2];
-    for(i=0;i<height;i++) {            /* Cb */
-        put_buffer(pb, ptr1, width);
-        ptr1 += picture->linesize[1];
+    for (i = 0; i < height; i++) {
+        avio_write(pb, ptr, width);
+        ptr += picture->linesize[0];
     }
-    for(i=0;i<height;i++) {    /* Cr */
-        put_buffer(pb, ptr2, width);
+
+    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  >>= h_chroma_shift;
+        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];
+        }
     }
-    put_flush_packet(pb);
+
+    avio_flush(pb);
     return 0;
 }
 
 static int yuv4_write_header(AVFormatContext *s)
 {
-    intfirst_pkt = s->priv_data;
-    
+    int *first_pkt = s->priv_data;
+
     if (s->nb_streams != 1)
-        return -EIO;
-    
-    if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) {
-        fprintf(stderr, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n");
-    } 
-    else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) {
-        fprintf(stderr, "ERROR: yuv4mpeg only handles 4:2:0, 4:1:1 YUV data. Use -pix_fmt to select one.\n");
-       return -EIO;
+        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;
     }
-    
-    *first_pkt = 1;
-    return 0;
-}
 
-static int yuv4_write_trailer(AVFormatContext *s)
-{
+    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 yuv4mpegpipe_oformat = {
-    "yuv4mpegpipe",
-    "YUV4MPEG pipe format",
-    "",
-    "yuv4mpeg",
-    sizeof(int),
-    CODEC_ID_NONE,
-    CODEC_ID_RAWVIDEO,
-    yuv4_write_header,
-    yuv4_write_packet,
-    yuv4_write_trailer,
-    .flags = AVFMT_RAWPICTURE,
+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 //CONFIG_ENCODERS
+#endif
 
 /* Header size increased to allow room for optional flags */
 #define MAX_YUV4_HEADER 80
-#define MAX_FRAME_HEADER 10
+#define MAX_FRAME_HEADER 80
 
-static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
+static int yuv4_read_header(AVFormatContext *s)
 {
-    char header[MAX_YUV4_HEADER+1];
+    char header[MAX_YUV4_HEADER + 10];  // Include headroom for
+                                        // the longest option
+    char *tokstart, *tokend, *header_end, interlaced = '?';
     int i;
-    ByteIOContext *pb = &s->pb;
-    int width, height, raten, rated, aspectn, aspectd;
-    char lacing;
+    AVIOContext *pb = s->pb;
+    int width = -1, height  = -1, raten   = 0,
+        rated =  0, aspectn =  0, aspectd = 0;
+    enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
+    enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
     AVStream *st;
-    
-    for (i=0; i<MAX_YUV4_HEADER; i++) {
-        header[i] = get_byte(pb);
-       if (header[i] == '\n') {
-           header[i+1] = 0;
-           break;
-       }
+
+    for (i = 0; i < MAX_YUV4_HEADER; i++) {
+        header[i] = avio_r8(pb);
+        if (header[i] == '\n') {
+            header[i + 1] = 0x20;  // Add a space after last option.
+                                   // Makes parsing "444" vs "444alpha" easier.
+            header[i + 2] = 0;
+            break;
+        }
+    }
+    if (i == MAX_YUV4_HEADER)
+        return -1;
+    if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
+        return -1;
+
+    header_end = &header[i + 1]; // Include space
+    for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
+         tokstart < header_end; tokstart++) {
+        if (*tokstart == 0x20)
+            continue;
+        switch (*tokstart++) {
+        case 'W': // Width. Required.
+            width    = strtol(tokstart, &tokend, 10);
+            tokstart = tokend;
+            break;
+        case 'H': // Height. Required.
+            height   = strtol(tokstart, &tokend, 10);
+            tokstart = tokend;
+            break;
+        case 'C': // Color space
+            if (strncmp("420jpeg", tokstart, 7) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P;
+                chroma_sample_location = AVCHROMA_LOC_CENTER;
+            } else if (strncmp("420mpeg2", tokstart, 8) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P;
+                chroma_sample_location = AVCHROMA_LOC_LEFT;
+            } else if (strncmp("420paldv", tokstart, 8) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P;
+                chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
+            } else if (strncmp("420p16", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P16;
+            } else if (strncmp("422p16", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV422P16;
+            } else if (strncmp("444p16", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV444P16;
+            } else if (strncmp("420p14", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P14;
+            } else if (strncmp("422p14", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV422P14;
+            } else if (strncmp("444p14", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV444P14;
+            } else if (strncmp("420p12", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P12;
+            } else if (strncmp("422p12", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV422P12;
+            } else if (strncmp("444p12", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV444P12;
+            } else if (strncmp("420p10", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P10;
+            } else if (strncmp("422p10", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV422P10;
+            } else if (strncmp("444p10", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV444P10;
+            } else if (strncmp("420p9", tokstart, 5) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P9;
+            } else if (strncmp("422p9", tokstart, 5) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV422P9;
+            } else if (strncmp("444p9", tokstart, 5) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV444P9;
+            } else if (strncmp("420", tokstart, 3) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P;
+                chroma_sample_location = AVCHROMA_LOC_CENTER;
+            } else if (strncmp("411", tokstart, 3) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV411P;
+            } else if (strncmp("422", tokstart, 3) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV422P;
+            } else if (strncmp("444alpha", tokstart, 8) == 0 ) {
+                av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
+                       "YUV4MPEG stream.\n");
+                return -1;
+            } else if (strncmp("444", tokstart, 3) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV444P;
+            } else if (strncmp("mono16", tokstart, 6) == 0) {
+                pix_fmt = AV_PIX_FMT_GRAY16;
+            } else if (strncmp("mono", tokstart, 4) == 0) {
+                pix_fmt = AV_PIX_FMT_GRAY8;
+            } else {
+                av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
+                       "pixel format.\n");
+                return -1;
+            }
+            while (tokstart < header_end && *tokstart != 0x20)
+                tokstart++;
+            break;
+        case 'I': // Interlace type
+            interlaced = *tokstart++;
+            break;
+        case 'F': // Frame rate
+            sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
+            while (tokstart < header_end && *tokstart != 0x20)
+                tokstart++;
+            break;
+        case 'A': // Pixel aspect
+            sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
+            while (tokstart < header_end && *tokstart != 0x20)
+                tokstart++;
+            break;
+        case 'X': // Vendor extensions
+            if (strncmp("YSCSS=", tokstart, 6) == 0) {
+                // Older nonstandard pixel format representation
+                tokstart += 6;
+                if (strncmp("420JPEG", tokstart, 7) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
+                else if (strncmp("420MPEG2", tokstart, 8) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
+                else if (strncmp("420PALDV", tokstart, 8) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
+                else if (strncmp("420P9", tokstart, 5) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P9;
+                else if (strncmp("422P9", tokstart, 5) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV422P9;
+                else if (strncmp("444P9", tokstart, 5) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV444P9;
+                else if (strncmp("420P10", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P10;
+                else if (strncmp("422P10", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV422P10;
+                else if (strncmp("444P10", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV444P10;
+                else if (strncmp("420P12", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P12;
+                else if (strncmp("422P12", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV422P12;
+                else if (strncmp("444P12", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV444P12;
+                else if (strncmp("420P14", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P14;
+                else if (strncmp("422P14", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV422P14;
+                else if (strncmp("444P14", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV444P14;
+                else if (strncmp("420P16", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P16;
+                else if (strncmp("422P16", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV422P16;
+                else if (strncmp("444P16", tokstart, 6) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV444P16;
+                else if (strncmp("411", tokstart, 3) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV411P;
+                else if (strncmp("422", tokstart, 3) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV422P;
+                else if (strncmp("444", tokstart, 3) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV444P;
+            }
+            while (tokstart < header_end && *tokstart != 0x20)
+                tokstart++;
+            break;
+        }
+    }
+
+    if (width == -1 || height == -1) {
+        av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
+        return -1;
+    }
+
+    if (pix_fmt == AV_PIX_FMT_NONE) {
+        if (alt_pix_fmt == AV_PIX_FMT_NONE)
+            pix_fmt = AV_PIX_FMT_YUV420P;
+        else
+            pix_fmt = alt_pix_fmt;
+    }
+
+    if (raten <= 0 || rated <= 0) {
+        // Frame rate unknown
+        raten = 25;
+        rated = 1;
+    }
+
+    if (aspectn == 0 && aspectd == 0) {
+        // Pixel aspect unknown
+        aspectd = 1;
+    }
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    st->codec->width  = width;
+    st->codec->height = height;
+    av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
+    avpriv_set_pts_info(st, 64, rated, raten);
+    st->codec->pix_fmt                = pix_fmt;
+    st->codec->codec_type             = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id               = AV_CODEC_ID_RAWVIDEO;
+    st->sample_aspect_ratio           = (AVRational){ aspectn, aspectd };
+    st->codec->chroma_sample_location = chroma_sample_location;
+
+    switch (interlaced){
+    case 'p':
+        st->codec->field_order = AV_FIELD_PROGRESSIVE;
+        break;
+    case 't':
+        st->codec->field_order = AV_FIELD_TB;
+        break;
+    case 'b':
+        st->codec->field_order = AV_FIELD_BT;
+        break;
+    case 'm':
+        av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
+               "interlaced and non-interlaced frames.\n");
+    case '?':
+        st->codec->field_order = AV_FIELD_UNKNOWN;
+        break;
+    default:
+        av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
+        return AVERROR(EINVAL);
     }
-    if (i == MAX_YUV4_HEADER) return -1;
-    if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
-    sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d",
-           &width, &height, &raten, &rated, &lacing, &aspectn, &aspectd);
-    
-    st = av_new_stream(s, 0);
-    st = s->streams[0];
-    st->codec.width = width;
-    st->codec.height = height;
-    av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
-    st->codec.frame_rate = raten;
-    st->codec.frame_rate_base = rated;
-    st->codec.pix_fmt = PIX_FMT_YUV420P;
-    st->codec.codec_type = CODEC_TYPE_VIDEO;
-    st->codec.codec_id = CODEC_ID_RAWVIDEO;
-    st->codec.sample_aspect_ratio= (AVRational){aspectn, aspectd};
 
     return 0;
 }
@@ -197,61 +553,59 @@ static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     int i;
     char header[MAX_FRAME_HEADER+1];
-    int packet_size, ret, width, height;
+    int packet_size, width, height, ret;
     AVStream *st = s->streams[0];
 
-    for (i=0; i<MAX_FRAME_HEADER; i++) {
-        header[i] = get_byte(&s->pb);
-       if (header[i] == '\n') {
-           header[i+1] = 0;
-           break;
-       }
+    for (i = 0; i < MAX_FRAME_HEADER; i++) {
+        header[i] = avio_r8(s->pb);
+        if (header[i] == '\n') {
+            header[i + 1] = 0;
+            break;
+        }
     }
-    if (i == MAX_FRAME_HEADER) return -1;
-    if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
-    
-    width = st->codec.width;
-    height = st->codec.height;
+    if (s->pb->error)
+        return s->pb->error;
+    else if (s->pb->eof_reached)
+        return AVERROR_EOF;
+    else if (i == MAX_FRAME_HEADER)
+        return AVERROR_INVALIDDATA;
+
+    if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
+        return AVERROR_INVALIDDATA;
 
-    packet_size = avpicture_get_size(st->codec.pix_fmt, width, height);
+    width  = st->codec->width;
+    height = st->codec->height;
+
+    packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
     if (packet_size < 0)
-        av_abort();
+        return packet_size;
 
-    if (av_new_packet(pkt, packet_size) < 0)
-        return -EIO;
+    ret = av_get_packet(s->pb, pkt, packet_size);
+    if (ret < 0)
+        return ret;
+    else if (ret != packet_size)
+        return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
 
     pkt->stream_index = 0;
-    ret = get_buffer(&s->pb, pkt->data, pkt->size);
-    if (ret != pkt->size) {
-        av_free_packet(pkt);
-        return -EIO;
-    } else {
-        return 0;
-    }
-}
-
-static int yuv4_read_close(AVFormatContext *s)
-{
     return 0;
 }
 
-AVInputFormat yuv4mpegpipe_iformat = {
-    "yuv4mpegpipe",
-    "YUV4MPEG pipe format",
-    0,
-    NULL,
-    yuv4_read_header,
-    yuv4_read_packet,
-    yuv4_read_close,
-    .extensions = "yuv4mpeg"
-};
-
-int yuv4mpeg_init(void)
+static int yuv4_probe(AVProbeData *pd)
 {
-    av_register_input_format(&yuv4mpegpipe_iformat);
-#ifdef CONFIG_ENCODERS
-    av_register_output_format(&yuv4mpegpipe_oformat);
-#endif //CONFIG_ENCODERS
-    return 0;
+    /* check file header */
+    if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
 }
 
+#if CONFIG_YUV4MPEGPIPE_DEMUXER
+AVInputFormat ff_yuv4mpegpipe_demuxer = {
+    .name           = "yuv4mpegpipe",
+    .long_name      = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
+    .read_probe     = yuv4_probe,
+    .read_header    = yuv4_read_header,
+    .read_packet    = yuv4_read_packet,
+    .extensions     = "y4m",
+};
+#endif