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FFmpeg/libavformat/yuv4mpeg.c

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  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. 

  22. #include "libavutil/pixdesc.h"

  23. #include "avformat.h"

  24. #include "internal.h"

  25. #include "libavutil/pixdesc.h"

  26. 

  27. #define Y4M_MAGIC "YUV4MPEG2"

  28. #define Y4M_FRAME_MAGIC "FRAME"

  29. #define Y4M_LINE_MAX 256

  30. 

  31. #if CONFIG_YUV4MPEGPIPE_MUXER

  32. static int yuv4_generate_header(AVFormatContext *s, char* buf)

  33. {

  34.     AVStream *st;

  35.     int width, height;

  36.     int raten, rated, aspectn, aspectd, n;

  37.     char inter;

  38.     const char *colorspace = "";

  39. 

  40.     st     = s->streams[0];

  41.     width  = st->codec->width;

  42.     height = st->codec->height;

  43. 

  44.     av_reduce(&raten, &rated, st->codec->time_base.den,

  45.               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)

  51.         aspectd = 0;  // 0:0 means unknown

  52. 

  53.     inter = 'p'; /* progressive is the default */

  54.     if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame)

  55.         inter = st->codec->coded_frame->top_field_first ? 't' : 'b';

  56.     if (st->codec->field_order == AV_FIELD_PROGRESSIVE) {

  57.         inter = 'p';

  58.     } else if (st->codec->field_order == AV_FIELD_TB || st->codec->field_order == AV_FIELD_TT) {

  59.         inter = 't';

  60.     } else if (st->codec->field_order == AV_FIELD_BT || st->codec->field_order == AV_FIELD_BB) {

  61.         inter = 'b';

  62.     }

  63. 

  64.     switch (st->codec->pix_fmt) {

  65.     case AV_PIX_FMT_GRAY8:

  66.         colorspace = " Cmono";

  67.         break;

  68.     case AV_PIX_FMT_GRAY16:

  69.         colorspace = " Cmono16";

  70.         break;

  71.     case AV_PIX_FMT_YUV411P:

  72.         colorspace = " C411 XYSCSS=411";

  73.         break;

  74.     case AV_PIX_FMT_YUV420P:

  75.         switch (st->codec->chroma_sample_location) {

  76.         case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break;

  77.         case AVCHROMA_LOC_LEFT:    colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break;

  78.         default:                   colorspace = " C420jpeg XYSCSS=420JPEG";   break;

  79.         }

  80.         break;

  81.     case AV_PIX_FMT_YUV422P:

  82.         colorspace = " C422 XYSCSS=422";

  83.         break;

  84.     case AV_PIX_FMT_YUV444P:

  85.         colorspace = " C444 XYSCSS=444";

  86.         break;

  87.     case AV_PIX_FMT_YUV420P9:

  88.         colorspace = " C420p9 XYSCSS=420P9";

  89.         break;

  90.     case AV_PIX_FMT_YUV422P9:

  91.         colorspace = " C422p9 XYSCSS=422P9";

  92.         break;

  93.     case AV_PIX_FMT_YUV444P9:

  94.         colorspace = " C444p9 XYSCSS=444P9";

  95.         break;

  96.     case AV_PIX_FMT_YUV420P10:

  97.         colorspace = " C420p10 XYSCSS=420P10";

  98.         break;

  99.     case AV_PIX_FMT_YUV422P10:

  100.         colorspace = " C422p10 XYSCSS=422P10";

  101.         break;

  102.     case AV_PIX_FMT_YUV444P10:

  103.         colorspace = " C444p10 XYSCSS=444P10";

  104.         break;

  105.     case AV_PIX_FMT_YUV420P12:

  106.         colorspace = " C420p12 XYSCSS=420P12";

  107.         break;

  108.     case AV_PIX_FMT_YUV422P12:

  109.         colorspace = " C422p12 XYSCSS=422P12";

  110.         break;

  111.     case AV_PIX_FMT_YUV444P12:

  112.         colorspace = " C444p12 XYSCSS=444P12";

  113.         break;

  114.     case AV_PIX_FMT_YUV420P14:

  115.         colorspace = " C420p14 XYSCSS=420P14";

  116.         break;

  117.     case AV_PIX_FMT_YUV422P14:

  118.         colorspace = " C422p14 XYSCSS=422P14";

  119.         break;

  120.     case AV_PIX_FMT_YUV444P14:

  121.         colorspace = " C444p14 XYSCSS=444P14";

  122.         break;

  123.     case AV_PIX_FMT_YUV420P16:

  124.         colorspace = " C420p16 XYSCSS=420P16";

  125.         break;

  126.     case AV_PIX_FMT_YUV422P16:

  127.         colorspace = " C422p16 XYSCSS=422P16";

  128.         break;

  129.     case AV_PIX_FMT_YUV444P16:

  130.         colorspace = " C444p16 XYSCSS=444P16";

  131.         break;

  132.     }

  133. 

  134.     /* construct stream header, if this is the first frame */

  135.     n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",

  136.                  Y4M_MAGIC, width, height, raten, rated, inter,

  137.                  aspectn, aspectd, colorspace);

  138. 

  139.     return n;

  140. }

  141. 

  142. static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)

  143. {

  144.     AVStream *st = s->streams[pkt->stream_index];

  145.     AVIOContext *pb = s->pb;

  146.     AVPicture *picture, picture_tmp;

  147.     int* first_pkt = s->priv_data;

  148.     int width, height, h_chroma_shift, v_chroma_shift;

  149.     int i;

  150.     char buf2[Y4M_LINE_MAX + 1];

  151.     char buf1[20];

  152.     uint8_t *ptr, *ptr1, *ptr2;

  153. 

  154.     memcpy(&picture_tmp, pkt->data, sizeof(AVPicture));

  155.     picture = &picture_tmp;

  156. 

  157.     /* for the first packet we have to output the header as well */

  158.     if (*first_pkt) {

  159.         *first_pkt = 0;

  160.         if (yuv4_generate_header(s, buf2) < 0) {

  161.             av_log(s, AV_LOG_ERROR,

  162.                    "Error. YUV4MPEG stream header write failed.\n");

  163.             return AVERROR(EIO);

  164.         } else {

  165.             avio_write(pb, buf2, strlen(buf2));

  166.         }

  167.     }

  168. 

  169.     /* construct frame header */

  170. 

  171.     snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);

  172.     avio_write(pb, buf1, strlen(buf1));

  173. 

  174.     width  = st->codec->width;

  175.     height = st->codec->height;

  176. 

  177.     ptr = picture->data[0];

  178. 

  179.     switch (st->codec->pix_fmt) {

  180.     case AV_PIX_FMT_GRAY8:

  181.     case AV_PIX_FMT_YUV411P:

  182.     case AV_PIX_FMT_YUV420P:

  183.     case AV_PIX_FMT_YUV422P:

  184.     case AV_PIX_FMT_YUV444P:

  185.         break;

  186.     case AV_PIX_FMT_GRAY16:

  187.     case AV_PIX_FMT_YUV420P9:

  188.     case AV_PIX_FMT_YUV422P9:

  189.     case AV_PIX_FMT_YUV444P9:

  190.     case AV_PIX_FMT_YUV420P10:

  191.     case AV_PIX_FMT_YUV422P10:

  192.     case AV_PIX_FMT_YUV444P10:

  193.     case AV_PIX_FMT_YUV420P12:

  194.     case AV_PIX_FMT_YUV422P12:

  195.     case AV_PIX_FMT_YUV444P12:

  196.     case AV_PIX_FMT_YUV420P14:

  197.     case AV_PIX_FMT_YUV422P14:

  198.     case AV_PIX_FMT_YUV444P14:

  199.     case AV_PIX_FMT_YUV420P16:

  200.     case AV_PIX_FMT_YUV422P16:

  201.     case AV_PIX_FMT_YUV444P16:

  202.         width *= 2;

  203.         break;

  204.     default:

  205.         av_log(s, AV_LOG_ERROR, "The pixel format '%s' is not supported.\n",

  206.                av_get_pix_fmt_name(st->codec->pix_fmt));

  207.         return AVERROR(EINVAL);

  208.     }

  209. 

  210.     for (i = 0; i < height; i++) {

  211.         avio_write(pb, ptr, width);

  212.         ptr += picture->linesize[0];

  213.     }

  214. 

  215.     if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8 &&

  216.         st->codec->pix_fmt != AV_PIX_FMT_GRAY16) {

  217.         // Adjust for smaller Cb and Cr planes

  218.         av_pix_fmt_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,

  219.                                          &v_chroma_shift);

  220.         width  >>= h_chroma_shift;

  221.         height >>= v_chroma_shift;

  222. 

  223.         ptr1 = picture->data[1];

  224.         ptr2 = picture->data[2];

  225.         for (i = 0; i < height; i++) {     /* Cb */

  226.             avio_write(pb, ptr1, width);

  227.             ptr1 += picture->linesize[1];

  228.         }

  229.         for (i = 0; i < height; i++) {     /* Cr */

  230.             avio_write(pb, ptr2, width);

  231.             ptr2 += picture->linesize[2];

  232.         }

  233.     }

  234. 

  235.     avio_flush(pb);

  236.     return 0;

  237. }

  238. 

  239. static int yuv4_write_header(AVFormatContext *s)

  240. {

  241.     int *first_pkt = s->priv_data;

  242. 

  243.     if (s->nb_streams != 1)

  244.         return AVERROR(EIO);

  245. 

  246.     if (s->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {

  247.         av_log(s, AV_LOG_ERROR, "ERROR: Only rawvideo supported.\n");

  248.         return AVERROR_INVALIDDATA;

  249.     }

  250. 

  251.     switch (s->streams[0]->codec->pix_fmt) {

  252.     case AV_PIX_FMT_YUV411P:

  253.         av_log(s, AV_LOG_WARNING, "Warning: generating rarely used 4:1:1 YUV "

  254.                "stream, some mjpegtools might not work.\n");

  255.         break;

  256.     case AV_PIX_FMT_GRAY8:

  257.     case AV_PIX_FMT_GRAY16:

  258.     case AV_PIX_FMT_YUV420P:

  259.     case AV_PIX_FMT_YUV422P:

  260.     case AV_PIX_FMT_YUV444P:

  261.         break;

  262.     case AV_PIX_FMT_YUV420P9:

  263.     case AV_PIX_FMT_YUV422P9:

  264.     case AV_PIX_FMT_YUV444P9:

  265.     case AV_PIX_FMT_YUV420P10:

  266.     case AV_PIX_FMT_YUV422P10:

  267.     case AV_PIX_FMT_YUV444P10:

  268.     case AV_PIX_FMT_YUV420P12:

  269.     case AV_PIX_FMT_YUV422P12:

  270.     case AV_PIX_FMT_YUV444P12:

  271.     case AV_PIX_FMT_YUV420P14:

  272.     case AV_PIX_FMT_YUV422P14:

  273.     case AV_PIX_FMT_YUV444P14:

  274.     case AV_PIX_FMT_YUV420P16:

  275.     case AV_PIX_FMT_YUV422P16:

  276.     case AV_PIX_FMT_YUV444P16:

  277.         if (s->streams[0]->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL) {

  278.             av_log(s, AV_LOG_ERROR, "'%s' is not a official yuv4mpegpipe pixel format. "

  279.                    "Use '-strict -1' to encode to this pixel format.\n",

  280.                    av_get_pix_fmt_name(s->streams[0]->codec->pix_fmt));

  281.             return AVERROR(EINVAL);

  282.         }

  283.         av_log(s, AV_LOG_WARNING, "Warning: generating non standard YUV stream. "

  284.                "Mjpegtools will not work.\n");

  285.         break;

  286.     default:

  287.         av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg can only handle "

  288.                "yuv444p, yuv422p, yuv420p, yuv411p and gray8 pixel formats. "

  289.                "And using 'strict -1' also yuv444p9, yuv422p9, yuv420p9, "

  290.                "yuv444p10, yuv422p10, yuv420p10, "

  291.                "yuv444p12, yuv422p12, yuv420p12, "

  292.                "yuv444p14, yuv422p14, yuv420p14, "

  293.                "yuv444p16, yuv422p16, yuv420p16 "

  294.                "and gray16 pixel formats. "

  295.                "Use -pix_fmt to select one.\n");

  296.         return AVERROR(EIO);

  297.     }

  298. 

  299.     *first_pkt = 1;

  300.     return 0;

  301. }

  302. 

  303. AVOutputFormat ff_yuv4mpegpipe_muxer = {

  304.     .name              = "yuv4mpegpipe",

  305.     .long_name         = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),

  306.     .extensions        = "y4m",

  307.     .priv_data_size    = sizeof(int),

  308.     .audio_codec       = AV_CODEC_ID_NONE,

  309.     .video_codec       = AV_CODEC_ID_RAWVIDEO,

  310.     .write_header      = yuv4_write_header,

  311.     .write_packet      = yuv4_write_packet,

  312.     .flags             = AVFMT_RAWPICTURE,

  313. };

  314. #endif

  315. 

  316. /* Header size increased to allow room for optional flags */

  317. #define MAX_YUV4_HEADER 80

  318. #define MAX_FRAME_HEADER 80

  319. 

  320. static int yuv4_read_header(AVFormatContext *s)

  321. {

  322.     char header[MAX_YUV4_HEADER + 10];  // Include headroom for

  323.                                         // the longest option

  324.     char *tokstart, *tokend, *header_end, interlaced = '?';

  325.     int i;

  326.     AVIOContext *pb = s->pb;

  327.     int width = -1, height  = -1, raten   = 0,

  328.         rated =  0, aspectn =  0, aspectd = 0;

  329.     enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;

  330.     enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;

  331.     AVStream *st;

  332. 

  333.     for (i = 0; i < MAX_YUV4_HEADER; i++) {

  334.         header[i] = avio_r8(pb);

  335.         if (header[i] == '\n') {

  336.             header[i + 1] = 0x20;  // Add a space after last option.

  337.                                    // Makes parsing "444" vs "444alpha" easier.

  338.             header[i + 2] = 0;

  339.             break;

  340.         }

  341.     }

  342.     if (i == MAX_YUV4_HEADER)

  343.         return -1;

  344.     if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))

  345.         return -1;

  346. 

  347.     header_end = &header[i + 1]; // Include space

  348.     for (tokstart = &header[strlen(Y4M_MAGIC) + 1];

  349.          tokstart < header_end; tokstart++) {

  350.         if (*tokstart == 0x20)

  351.             continue;

  352.         switch (*tokstart++) {

  353.         case 'W': // Width. Required.

  354.             width    = strtol(tokstart, &tokend, 10);

  355.             tokstart = tokend;

  356.             break;

  357.         case 'H': // Height. Required.

  358.             height   = strtol(tokstart, &tokend, 10);

  359.             tokstart = tokend;

  360.             break;

  361.         case 'C': // Color space

  362.             if (strncmp("420jpeg", tokstart, 7) == 0) {

  363.                 pix_fmt = AV_PIX_FMT_YUV420P;

  364.                 chroma_sample_location = AVCHROMA_LOC_CENTER;

  365.             } else if (strncmp("420mpeg2", tokstart, 8) == 0) {

  366.                 pix_fmt = AV_PIX_FMT_YUV420P;

  367.                 chroma_sample_location = AVCHROMA_LOC_LEFT;

  368.             } else if (strncmp("420paldv", tokstart, 8) == 0) {

  369.                 pix_fmt = AV_PIX_FMT_YUV420P;

  370.                 chroma_sample_location = AVCHROMA_LOC_TOPLEFT;

  371.             } else if (strncmp("420p16", tokstart, 6) == 0) {

  372.                 pix_fmt = AV_PIX_FMT_YUV420P16;

  373.             } else if (strncmp("422p16", tokstart, 6) == 0) {

  374.                 pix_fmt = AV_PIX_FMT_YUV422P16;

  375.             } else if (strncmp("444p16", tokstart, 6) == 0) {

  376.                 pix_fmt = AV_PIX_FMT_YUV444P16;

  377.             } else if (strncmp("420p14", tokstart, 6) == 0) {

  378.                 pix_fmt = AV_PIX_FMT_YUV420P14;

  379.             } else if (strncmp("422p14", tokstart, 6) == 0) {

  380.                 pix_fmt = AV_PIX_FMT_YUV422P14;

  381.             } else if (strncmp("444p14", tokstart, 6) == 0) {

  382.                 pix_fmt = AV_PIX_FMT_YUV444P14;

  383.             } else if (strncmp("420p12", tokstart, 6) == 0) {

  384.                 pix_fmt = AV_PIX_FMT_YUV420P12;

  385.             } else if (strncmp("422p12", tokstart, 6) == 0) {

  386.                 pix_fmt = AV_PIX_FMT_YUV422P12;

  387.             } else if (strncmp("444p12", tokstart, 6) == 0) {

  388.                 pix_fmt = AV_PIX_FMT_YUV444P12;

  389.             } else if (strncmp("420p10", tokstart, 6) == 0) {

  390.                 pix_fmt = AV_PIX_FMT_YUV420P10;

  391.             } else if (strncmp("422p10", tokstart, 6) == 0) {

  392.                 pix_fmt = AV_PIX_FMT_YUV422P10;

  393.             } else if (strncmp("444p10", tokstart, 6) == 0) {

  394.                 pix_fmt = AV_PIX_FMT_YUV444P10;

  395.             } else if (strncmp("420p9", tokstart, 5) == 0) {

  396.                 pix_fmt = AV_PIX_FMT_YUV420P9;

  397.             } else if (strncmp("422p9", tokstart, 5) == 0) {

  398.                 pix_fmt = AV_PIX_FMT_YUV422P9;

  399.             } else if (strncmp("444p9", tokstart, 5) == 0) {

  400.                 pix_fmt = AV_PIX_FMT_YUV444P9;

  401.             } else if (strncmp("420", tokstart, 3) == 0) {

  402.                 pix_fmt = AV_PIX_FMT_YUV420P;

  403.                 chroma_sample_location = AVCHROMA_LOC_CENTER;

  404.             } else if (strncmp("411", tokstart, 3) == 0) {

  405.                 pix_fmt = AV_PIX_FMT_YUV411P;

  406.             } else if (strncmp("422", tokstart, 3) == 0) {

  407.                 pix_fmt = AV_PIX_FMT_YUV422P;

  408.             } else if (strncmp("444alpha", tokstart, 8) == 0 ) {

  409.                 av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "

  410.                        "YUV4MPEG stream.\n");

  411.                 return -1;

  412.             } else if (strncmp("444", tokstart, 3) == 0) {

  413.                 pix_fmt = AV_PIX_FMT_YUV444P;

  414.             } else if (strncmp("mono16", tokstart, 6) == 0) {

  415.                 pix_fmt = AV_PIX_FMT_GRAY16;

  416.             } else if (strncmp("mono", tokstart, 4) == 0) {

  417.                 pix_fmt = AV_PIX_FMT_GRAY8;

  418.             } else {

  419.                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "

  420.                        "pixel format.\n");

  421.                 return -1;

  422.             }

  423.             while (tokstart < header_end && *tokstart != 0x20)

  424.                 tokstart++;

  425.             break;

  426.         case 'I': // Interlace type

  427.             interlaced = *tokstart++;

  428.             break;

  429.         case 'F': // Frame rate

  430.             sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown

  431.             while (tokstart < header_end && *tokstart != 0x20)

  432.                 tokstart++;

  433.             break;

  434.         case 'A': // Pixel aspect

  435.             sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown

  436.             while (tokstart < header_end && *tokstart != 0x20)

  437.                 tokstart++;

  438.             break;

  439.         case 'X': // Vendor extensions

  440.             if (strncmp("YSCSS=", tokstart, 6) == 0) {

  441.                 // Older nonstandard pixel format representation

  442.                 tokstart += 6;

  443.                 if (strncmp("420JPEG", tokstart, 7) == 0)

  444.                     alt_pix_fmt = AV_PIX_FMT_YUV420P;

  445.                 else if (strncmp("420MPEG2", tokstart, 8) == 0)

  446.                     alt_pix_fmt = AV_PIX_FMT_YUV420P;

  447.                 else if (strncmp("420PALDV", tokstart, 8) == 0)

  448.                     alt_pix_fmt = AV_PIX_FMT_YUV420P;

  449.                 else if (strncmp("420P9", tokstart, 5) == 0)

  450.                     alt_pix_fmt = AV_PIX_FMT_YUV420P9;

  451.                 else if (strncmp("422P9", tokstart, 5) == 0)

  452.                     alt_pix_fmt = AV_PIX_FMT_YUV422P9;

  453.                 else if (strncmp("444P9", tokstart, 5) == 0)

  454.                     alt_pix_fmt = AV_PIX_FMT_YUV444P9;

  455.                 else if (strncmp("420P10", tokstart, 6) == 0)

  456.                     alt_pix_fmt = AV_PIX_FMT_YUV420P10;

  457.                 else if (strncmp("422P10", tokstart, 6) == 0)

  458.                     alt_pix_fmt = AV_PIX_FMT_YUV422P10;

  459.                 else if (strncmp("444P10", tokstart, 6) == 0)

  460.                     alt_pix_fmt = AV_PIX_FMT_YUV444P10;

  461.                 else if (strncmp("420P12", tokstart, 6) == 0)

  462.                     alt_pix_fmt = AV_PIX_FMT_YUV420P12;

  463.                 else if (strncmp("422P12", tokstart, 6) == 0)

  464.                     alt_pix_fmt = AV_PIX_FMT_YUV422P12;

  465.                 else if (strncmp("444P12", tokstart, 6) == 0)

  466.                     alt_pix_fmt = AV_PIX_FMT_YUV444P12;

  467.                 else if (strncmp("420P14", tokstart, 6) == 0)

  468.                     alt_pix_fmt = AV_PIX_FMT_YUV420P14;

  469.                 else if (strncmp("422P14", tokstart, 6) == 0)

  470.                     alt_pix_fmt = AV_PIX_FMT_YUV422P14;

  471.                 else if (strncmp("444P14", tokstart, 6) == 0)

  472.                     alt_pix_fmt = AV_PIX_FMT_YUV444P14;

  473.                 else if (strncmp("420P16", tokstart, 6) == 0)

  474.                     alt_pix_fmt = AV_PIX_FMT_YUV420P16;

  475.                 else if (strncmp("422P16", tokstart, 6) == 0)

  476.                     alt_pix_fmt = AV_PIX_FMT_YUV422P16;

  477.                 else if (strncmp("444P16", tokstart, 6) == 0)

  478.                     alt_pix_fmt = AV_PIX_FMT_YUV444P16;

  479.                 else if (strncmp("411", tokstart, 3) == 0)

  480.                     alt_pix_fmt = AV_PIX_FMT_YUV411P;

  481.                 else if (strncmp("422", tokstart, 3) == 0)

  482.                     alt_pix_fmt = AV_PIX_FMT_YUV422P;

  483.                 else if (strncmp("444", tokstart, 3) == 0)

  484.                     alt_pix_fmt = AV_PIX_FMT_YUV444P;

  485.             }

  486.             while (tokstart < header_end && *tokstart != 0x20)

  487.                 tokstart++;

  488.             break;

  489.         }

  490.     }

  491. 

  492.     if (width == -1 || height == -1) {

  493.         av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");

  494.         return -1;

  495.     }

  496. 

  497.     if (pix_fmt == AV_PIX_FMT_NONE) {

  498.         if (alt_pix_fmt == AV_PIX_FMT_NONE)

  499.             pix_fmt = AV_PIX_FMT_YUV420P;

  500.         else

  501.             pix_fmt = alt_pix_fmt;

  502.     }

  503. 

  504.     if (raten <= 0 || rated <= 0) {

  505.         // Frame rate unknown

  506.         raten = 25;

  507.         rated = 1;

  508.     }

  509. 

  510.     if (aspectn == 0 && aspectd == 0) {

  511.         // Pixel aspect unknown

  512.         aspectd = 1;

  513.     }

  514. 

  515.     st = avformat_new_stream(s, NULL);

  516.     if (!st)

  517.         return AVERROR(ENOMEM);

  518.     st->codec->width  = width;

  519.     st->codec->height = height;

  520.     av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);

  521.     avpriv_set_pts_info(st, 64, rated, raten);

  522.     st->codec->pix_fmt                = pix_fmt;

  523.     st->codec->codec_type             = AVMEDIA_TYPE_VIDEO;

  524.     st->codec->codec_id               = AV_CODEC_ID_RAWVIDEO;

  525.     st->sample_aspect_ratio           = (AVRational){ aspectn, aspectd };

  526.     st->codec->chroma_sample_location = chroma_sample_location;

  527. 

  528.     switch (interlaced){

  529.     case 'p':

  530.         st->codec->field_order = AV_FIELD_PROGRESSIVE;

  531.         break;

  532.     case 't':

  533.         st->codec->field_order = AV_FIELD_TB;

  534.         break;

  535.     case 'b':

  536.         st->codec->field_order = AV_FIELD_BT;

  537.         break;

  538.     case 'm':

  539.         av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "

  540.                "interlaced and non-interlaced frames.\n");

  541.     case '?':

  542.         st->codec->field_order = AV_FIELD_UNKNOWN;

  543.         break;

  544.     default:

  545.         av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");

  546.         return AVERROR(EINVAL);

  547.     }

  548. 

  549.     return 0;

  550. }

  551. 

  552. static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)

  553. {

  554.     int i;

  555.     char header[MAX_FRAME_HEADER+1];

  556.     int packet_size, width, height, ret;

  557.     AVStream *st = s->streams[0];

  558. 

  559.     for (i = 0; i < MAX_FRAME_HEADER; i++) {

  560.         header[i] = avio_r8(s->pb);

  561.         if (header[i] == '\n') {

  562.             header[i + 1] = 0;

  563.             break;

  564.         }

  565.     }

  566.     if (s->pb->error)

  567.         return s->pb->error;

  568.     else if (s->pb->eof_reached)

  569.         return AVERROR_EOF;

  570.     else if (i == MAX_FRAME_HEADER)

  571.         return AVERROR_INVALIDDATA;

  572. 

  573.     if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))

  574.         return AVERROR_INVALIDDATA;

  575. 

  576.     width  = st->codec->width;

  577.     height = st->codec->height;

  578. 

  579.     packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);

  580.     if (packet_size < 0)

  581.         return packet_size;

  582. 

  583.     ret = av_get_packet(s->pb, pkt, packet_size);

  584.     if (ret < 0)

  585.         return ret;

  586.     else if (ret != packet_size)

  587.         return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);

  588. 

  589.     pkt->stream_index = 0;

  590.     return 0;

  591. }

  592. 

  593. static int yuv4_probe(AVProbeData *pd)

  594. {

  595.     /* check file header */

  596.     if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)

  597.         return AVPROBE_SCORE_MAX;

  598.     else

  599.         return 0;

  600. }

  601. 

  602. #if CONFIG_YUV4MPEGPIPE_DEMUXER

  603. AVInputFormat ff_yuv4mpegpipe_demuxer = {

  604.     .name           = "yuv4mpegpipe",

  605.     .long_name      = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),

  606.     .read_probe     = yuv4_probe,

  607.     .read_header    = yuv4_read_header,

  608.     .read_packet    = yuv4_read_packet,

  609.     .extensions     = "y4m",

  610. };

  611. #endif