/*
  * YUV4MPEG format

  * 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 "avformat.h"

 #include "internal.h"

 #include "libavutil/pixdesc.h"

 
 #define Y4M_MAGIC "YUV4MPEG2"
 #define Y4M_FRAME_MAGIC "FRAME"
 #define Y4M_LINE_MAX 256
 

 struct frame_attributes {
     int interlaced_frame;
     int top_field_first;
 };
 

 #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';

     switch (st->codec->pix_fmt) {

     case PIX_FMT_GRAY8:
         colorspace = " Cmono";
         break;

     case PIX_FMT_GRAY16:
         colorspace = " Cmono16";
         break;

     case PIX_FMT_YUV411P:
         colorspace = " C411 XYSCSS=411";
         break;
     case 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 PIX_FMT_YUV422P:
         colorspace = " C422 XYSCSS=422";
         break;
     case PIX_FMT_YUV444P:
         colorspace = " C444 XYSCSS=444";
         break;

     case PIX_FMT_YUV420P9:
         colorspace = " C420p9 XYSCSS=420P9";
         break;
     case PIX_FMT_YUV422P9:
         colorspace = " C422p9 XYSCSS=422P9";
         break;
     case PIX_FMT_YUV444P9:
         colorspace = " C444p9 XYSCSS=444P9";
         break;
     case PIX_FMT_YUV420P10:
         colorspace = " C420p10 XYSCSS=420P10";
         break;
     case PIX_FMT_YUV422P10:
         colorspace = " C422p10 XYSCSS=422P10";
         break;
     case PIX_FMT_YUV444P10:
         colorspace = " C444p10 XYSCSS=444P10";
         break;
     case PIX_FMT_YUV420P16:
         colorspace = " C420p16 XYSCSS=420P16";
         break;
     case PIX_FMT_YUV422P16:
         colorspace = " C422p16 XYSCSS=422P16";
         break;
     case 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 PIX_FMT_GRAY8:
     case PIX_FMT_YUV411P:
     case PIX_FMT_YUV420P:
     case PIX_FMT_YUV422P:
     case PIX_FMT_YUV444P:
         break;
     case PIX_FMT_GRAY16:
     case PIX_FMT_YUV420P9:
     case PIX_FMT_YUV422P9:
     case PIX_FMT_YUV444P9:
     case PIX_FMT_YUV420P10:
     case PIX_FMT_YUV422P10:
     case PIX_FMT_YUV444P10:
     case PIX_FMT_YUV420P16:
     case PIX_FMT_YUV422P16:
     case 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 != PIX_FMT_GRAY8 &&
         st->codec->pix_fmt != PIX_FMT_GRAY16) {

         // Adjust for smaller Cb and Cr planes
         avcodec_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];

         }

     }

     avio_flush(pb);

     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,
                "A non-rawvideo stream was selected, but yuv4mpeg only handles rawvideo streams\n");
         return AVERROR(EINVAL);
     }
 

     switch (s->streams[0]->codec->pix_fmt) {
     case 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 PIX_FMT_GRAY8:
     case PIX_FMT_GRAY16:
     case PIX_FMT_YUV420P:
     case PIX_FMT_YUV422P:
     case PIX_FMT_YUV444P:
         break;
     case PIX_FMT_YUV420P9:
     case PIX_FMT_YUV422P9:
     case PIX_FMT_YUV444P9:
     case PIX_FMT_YUV420P10:
     case PIX_FMT_YUV422P10:
     case PIX_FMT_YUV444P10:
     case PIX_FMT_YUV420P16:
     case PIX_FMT_YUV422P16:
     case 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 standart 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, "
                "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

 /* Header size increased to allow room for optional flags */
 #define MAX_YUV4_HEADER 80

 #define MAX_FRAME_HEADER 80

 static int yuv4_read_header(AVFormatContext *s)

 {

     char header[MAX_YUV4_HEADER + 10];  // Include headroom for
                                         // the longest option
     char *tokstart, *tokend, *header_end;

     int i;

     AVIOContext *pb = s->pb;

     int width = -1, height  = -1, raten   = 0,
         rated =  0, aspectn =  0, aspectd = 0;
     enum PixelFormat pix_fmt = PIX_FMT_NONE, alt_pix_fmt = PIX_FMT_NONE;

     enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;

     AVStream *st;

     struct frame_attributes *s1 = s->priv_data;

     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;

     s1->interlaced_frame = 0;
     s1->top_field_first = 0;

     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 = PIX_FMT_YUV420P;

                 chroma_sample_location = AVCHROMA_LOC_CENTER;

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

                 pix_fmt = PIX_FMT_YUV420P;

                 chroma_sample_location = AVCHROMA_LOC_LEFT;

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

                 pix_fmt = PIX_FMT_YUV420P;

                 chroma_sample_location = AVCHROMA_LOC_TOPLEFT;

             } else if (strncmp("420p16", tokstart, 6) == 0) {
                 pix_fmt = PIX_FMT_YUV420P16;
             } else if (strncmp("422p16", tokstart, 6) == 0) {
                 pix_fmt = PIX_FMT_YUV422P16;
             } else if (strncmp("444p16", tokstart, 6) == 0) {
                 pix_fmt = PIX_FMT_YUV444P16;
             } else if (strncmp("420p10", tokstart, 6) == 0) {
                 pix_fmt = PIX_FMT_YUV420P10;
             } else if (strncmp("422p10", tokstart, 6) == 0) {
                 pix_fmt = PIX_FMT_YUV422P10;
             } else if (strncmp("444p10", tokstart, 6) == 0) {
                 pix_fmt = PIX_FMT_YUV444P10;
             } else if (strncmp("420p9", tokstart, 5) == 0) {
                 pix_fmt = PIX_FMT_YUV420P9;
             } else if (strncmp("422p9", tokstart, 5) == 0) {
                 pix_fmt = PIX_FMT_YUV422P9;
             } else if (strncmp("444p9", tokstart, 5) == 0) {
                 pix_fmt = PIX_FMT_YUV444P9;

             } else if (strncmp("420", tokstart, 3) == 0) {
                 pix_fmt = PIX_FMT_YUV420P;
                 chroma_sample_location = AVCHROMA_LOC_CENTER;

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

                 pix_fmt = PIX_FMT_YUV411P;

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

                 pix_fmt = 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 = PIX_FMT_YUV444P;

             } else if (strncmp("mono16", tokstart, 6) == 0) {
                 pix_fmt = PIX_FMT_GRAY16;

             } else if (strncmp("mono", tokstart, 4) == 0) {
                 pix_fmt = 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
             switch (*tokstart++){
             case '?':
                 break;
             case 'p':

                 s1->interlaced_frame = 0;

                 break;
             case 't':

                 s1->interlaced_frame = 1;
                 s1->top_field_first = 1;

                 break;
             case 'b':

                 s1->interlaced_frame = 1;
                 s1->top_field_first = 0;

                 break;
             case 'm':

                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
                        "interlaced and non-interlaced frames.\n");

                 return -1;
             default:
                 av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
                 return -1;
             }
             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 = PIX_FMT_YUV420P;
                 else if (strncmp("420MPEG2", tokstart, 8) == 0)
                     alt_pix_fmt = PIX_FMT_YUV420P;
                 else if (strncmp("420PALDV", tokstart, 8) == 0)
                     alt_pix_fmt = PIX_FMT_YUV420P;

                 else if (strncmp("420P9", tokstart, 5) == 0)
                     alt_pix_fmt = PIX_FMT_YUV420P9;
                 else if (strncmp("422P9", tokstart, 5) == 0)
                     alt_pix_fmt = PIX_FMT_YUV422P9;
                 else if (strncmp("444P9", tokstart, 5) == 0)
                     alt_pix_fmt = PIX_FMT_YUV444P9;
                 else if (strncmp("420P10", tokstart, 6) == 0)
                     alt_pix_fmt = PIX_FMT_YUV420P10;
                 else if (strncmp("422P10", tokstart, 6) == 0)
                     alt_pix_fmt = PIX_FMT_YUV422P10;
                 else if (strncmp("444P10", tokstart, 6) == 0)
                     alt_pix_fmt = PIX_FMT_YUV444P10;
                 else if (strncmp("420P16", tokstart, 6) == 0)
                     alt_pix_fmt = PIX_FMT_YUV420P16;
                 else if (strncmp("422P16", tokstart, 6) == 0)
                     alt_pix_fmt = PIX_FMT_YUV422P16;
                 else if (strncmp("444P16", tokstart, 6) == 0)
                     alt_pix_fmt = PIX_FMT_YUV444P16;

                 else if (strncmp("411", tokstart, 3) == 0)
                     alt_pix_fmt = PIX_FMT_YUV411P;
                 else if (strncmp("422", tokstart, 3) == 0)
                     alt_pix_fmt = PIX_FMT_YUV422P;
                 else if (strncmp("444", tokstart, 3) == 0)
                     alt_pix_fmt = 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 == PIX_FMT_NONE) {
         if (alt_pix_fmt == PIX_FMT_NONE)

             pix_fmt = 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;

 
     return 0;
 }
 
 static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     int i;
     char header[MAX_FRAME_HEADER+1];

     int packet_size, width, height;

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

     struct frame_attributes *s1 = s->priv_data;

     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;

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

     if (packet_size < 0)

         return -1;

     if (av_get_packet(s->pb, pkt, packet_size) != packet_size)

         return AVERROR(EIO);

     if (st->codec->coded_frame) {
         st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
         st->codec->coded_frame->top_field_first  = s1->top_field_first;

     }
 

     pkt->stream_index = 0;

     return 0;

 }
 

 static int yuv4_probe(AVProbeData *pd)
 {
     /* 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"),

     .priv_data_size = sizeof(struct frame_attributes),
     .read_probe     = yuv4_probe,
     .read_header    = yuv4_read_header,
     .read_packet    = yuv4_read_packet,

     .extensions     = "y4m",

 };

 #endif