| 1 | /*
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| 2 | * YUV4MPEG format
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| 3 | * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
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| 4 | *
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| 5 | * This library is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU Lesser General Public
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| 7 | * License as published by the Free Software Foundation; either
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| 8 | * version 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * This library is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | * Lesser General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU Lesser General Public
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| 16 | * License along with this library; if not, write to the Free Software
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| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 18 | */
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| 19 | #include "avformat.h"
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| 20 |
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| 21 | #define Y4M_MAGIC "YUV4MPEG2"
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| 22 | #define Y4M_FRAME_MAGIC "FRAME"
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| 23 | #define Y4M_LINE_MAX 256
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| 24 |
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| 25 | struct frame_attributes {
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| 26 | int interlaced_frame;
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| 27 | int top_field_first;
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| 28 | };
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| 29 |
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| 30 | #ifdef CONFIG_MUXERS
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| 31 |
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| 32 | static int yuv4_generate_header(AVFormatContext *s, char* buf)
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| 33 | {
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| 34 | AVStream *st;
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| 35 | int width, height;
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| 36 | int raten, rated, aspectn, aspectd, n;
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| 37 | char inter;
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| 38 | const char *colorspace = "";
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| 39 |
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| 40 | st = s->streams[0];
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| 41 | width = st->codec->width;
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| 42 | height = st->codec->height;
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| 43 |
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| 44 | av_reduce(&raten, &rated, st->codec->time_base.den, st->codec->time_base.num, (1UL<<31)-1);
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| 45 |
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| 46 | aspectn = st->codec->sample_aspect_ratio.num;
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| 47 | aspectd = st->codec->sample_aspect_ratio.den;
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| 48 |
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| 49 | if ( aspectn == 0 && aspectd == 1 ) aspectd = 0; // 0:0 means unknown
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| 50 |
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| 51 | inter = 'p'; /* progressive is the default */
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| 52 | if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame) {
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| 53 | inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
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| 54 | }
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| 55 |
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| 56 | switch(st->codec->pix_fmt) {
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| 57 | case PIX_FMT_GRAY8:
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| 58 | colorspace = " Cmono";
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| 59 | break;
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| 60 | case PIX_FMT_YUV411P:
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| 61 | colorspace = " C411 XYSCSS=411";
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| 62 | break;
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| 63 | case PIX_FMT_YUV420P:
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| 64 | colorspace = (st->codec->codec_id == CODEC_ID_DVVIDEO)?" C420paldv XYSCSS=420PALDV":" C420mpeg2 XYSCSS=420MPEG2";
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| 65 | break;
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| 66 | case PIX_FMT_YUV422P:
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| 67 | colorspace = " C422 XYSCSS=422";
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| 68 | break;
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| 69 | case PIX_FMT_YUV444P:
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| 70 | colorspace = " C444 XYSCSS=444";
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| 71 | break;
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| 72 | }
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| 73 |
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| 74 | /* construct stream header, if this is the first frame */
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| 75 | n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n",
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| 76 | Y4M_MAGIC,
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| 77 | width,
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| 78 | height,
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| 79 | raten, rated,
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| 80 | inter,
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| 81 | aspectn, aspectd,
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| 82 | colorspace);
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| 83 |
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| 84 | return n;
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| 85 | }
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| 86 |
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| 87 | static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
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| 88 | {
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| 89 | AVStream *st = s->streams[pkt->stream_index];
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| 90 | ByteIOContext *pb = &s->pb;
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| 91 | AVPicture *picture;
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| 92 | int* first_pkt = s->priv_data;
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| 93 | int width, height, h_chroma_shift, v_chroma_shift;
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| 94 | int i, m;
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| 95 | char buf2[Y4M_LINE_MAX+1];
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| 96 | char buf1[20];
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| 97 | uint8_t *ptr, *ptr1, *ptr2;
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| 98 |
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| 99 | picture = (AVPicture *)pkt->data;
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| 100 |
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| 101 | /* for the first packet we have to output the header as well */
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| 102 | if (*first_pkt) {
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| 103 | *first_pkt = 0;
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| 104 | if (yuv4_generate_header(s, buf2) < 0) {
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| 105 | av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n");
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| 106 | return AVERROR_IO;
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| 107 | } else {
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| 108 | put_buffer(pb, buf2, strlen(buf2));
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| 109 | }
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| 110 | }
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| 111 |
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| 112 | /* construct frame header */
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| 113 |
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| 114 | m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
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| 115 | put_buffer(pb, buf1, strlen(buf1));
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| 116 |
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| 117 | width = st->codec->width;
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| 118 | height = st->codec->height;
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| 119 |
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| 120 | ptr = picture->data[0];
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| 121 | for(i=0;i<height;i++) {
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| 122 | put_buffer(pb, ptr, width);
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| 123 | ptr += picture->linesize[0];
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| 124 | }
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| 125 |
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| 126 | if (st->codec->pix_fmt != PIX_FMT_GRAY8){
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| 127 | // Adjust for smaller Cb and Cr planes
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| 128 | avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift, &v_chroma_shift);
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| 129 | width >>= h_chroma_shift;
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| 130 | height >>= v_chroma_shift;
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| 131 |
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| 132 | ptr1 = picture->data[1];
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| 133 | ptr2 = picture->data[2];
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| 134 | for(i=0;i<height;i++) { /* Cb */
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| 135 | put_buffer(pb, ptr1, width);
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| 136 | ptr1 += picture->linesize[1];
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| 137 | }
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| 138 | for(i=0;i<height;i++) { /* Cr */
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| 139 | put_buffer(pb, ptr2, width);
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| 140 | ptr2 += picture->linesize[2];
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| 141 | }
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| 142 | }
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| 143 | put_flush_packet(pb);
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| 144 | return 0;
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| 145 | }
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| 146 |
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| 147 | static int yuv4_write_header(AVFormatContext *s)
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| 148 | {
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| 149 | int* first_pkt = s->priv_data;
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| 150 |
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| 151 | if (s->nb_streams != 1)
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| 152 | return AVERROR_IO;
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| 153 |
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| 154 | if (s->streams[0]->codec->pix_fmt == PIX_FMT_YUV411P) {
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| 155 | av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV stream, some mjpegtools might not work.\n");
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| 156 | }
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| 157 | else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) &&
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| 158 | (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) &&
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| 159 | (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) &&
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| 160 | (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) {
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| 161 | av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, yuv422p, yuv420p, yuv411p and gray pixel formats. Use -pix_fmt to select one.\n");
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| 162 | return AVERROR_IO;
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| 163 | }
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| 164 |
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| 165 | *first_pkt = 1;
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| 166 | return 0;
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| 167 | }
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| 168 |
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| 169 | static int yuv4_write_trailer(AVFormatContext *s)
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| 170 | {
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| 171 | return 0;
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| 172 | }
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| 173 |
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| 174 | AVOutputFormat yuv4mpegpipe_muxer = {
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| 175 | "yuv4mpegpipe",
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| 176 | "YUV4MPEG pipe format",
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| 177 | "",
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| 178 | "y4m",
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| 179 | sizeof(int),
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| 180 | CODEC_ID_NONE,
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| 181 | CODEC_ID_RAWVIDEO,
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| 182 | yuv4_write_header,
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| 183 | yuv4_write_packet,
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| 184 | yuv4_write_trailer,
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| 185 | .flags = AVFMT_RAWPICTURE,
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| 186 | };
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| 187 | #endif //CONFIG_MUXERS
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| 188 |
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| 189 | /* Header size increased to allow room for optional flags */
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| 190 | #define MAX_YUV4_HEADER 80
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| 191 | #define MAX_FRAME_HEADER 80
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| 192 |
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| 193 | static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
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| 194 | {
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| 195 | char header[MAX_YUV4_HEADER+10]; // Include headroom for the longest option
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| 196 | char *tokstart,*tokend,*header_end;
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| 197 | int i;
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| 198 | ByteIOContext *pb = &s->pb;
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| 199 | int width=-1, height=-1, raten=0, rated=0, aspectn=0, aspectd=0;
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| 200 | enum PixelFormat pix_fmt=PIX_FMT_NONE,alt_pix_fmt=PIX_FMT_NONE;
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| 201 | AVStream *st;
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| 202 | struct frame_attributes *s1 = s->priv_data;
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| 203 |
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| 204 | for (i=0; i<MAX_YUV4_HEADER; i++) {
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| 205 | header[i] = get_byte(pb);
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| 206 | if (header[i] == '\n') {
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| 207 | header[i+1] = 0x20; // Add a space after last option. Makes parsing "444" vs "444alpha" easier.
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| 208 | header[i+2] = 0;
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| 209 | break;
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| 210 | }
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| 211 | }
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| 212 | if (i == MAX_YUV4_HEADER) return -1;
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| 213 | if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1;
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| 214 |
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| 215 | s1->interlaced_frame = 0;
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| 216 | s1->top_field_first = 0;
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| 217 | header_end = &header[i+1]; // Include space
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| 218 | for(tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) {
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| 219 | if (*tokstart==0x20) continue;
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| 220 | switch (*tokstart++) {
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| 221 | case 'W': // Width. Required.
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| 222 | width = strtol(tokstart, &tokend, 10);
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| 223 | tokstart=tokend;
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| 224 | break;
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| 225 | case 'H': // Height. Required.
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| 226 | height = strtol(tokstart, &tokend, 10);
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| 227 | tokstart=tokend;
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| 228 | break;
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| 229 | case 'C': // Color space
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| 230 | if (strncmp("420jpeg",tokstart,7)==0)
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| 231 | pix_fmt = PIX_FMT_YUV420P;
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| 232 | else if (strncmp("420mpeg2",tokstart,8)==0)
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| 233 | pix_fmt = PIX_FMT_YUV420P;
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| 234 | else if (strncmp("420paldv", tokstart, 8)==0)
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| 235 | pix_fmt = PIX_FMT_YUV420P;
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| 236 | else if (strncmp("411", tokstart, 3)==0)
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| 237 | pix_fmt = PIX_FMT_YUV411P;
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| 238 | else if (strncmp("422", tokstart, 3)==0)
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| 239 | pix_fmt = PIX_FMT_YUV422P;
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| 240 | else if (strncmp("444alpha", tokstart, 8)==0) {
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| 241 | av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 YUV4MPEG stream.\n");
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| 242 | return -1;
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| 243 | } else if (strncmp("444", tokstart, 3)==0)
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| 244 | pix_fmt = PIX_FMT_YUV444P;
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| 245 | else if (strncmp("mono",tokstart, 4)==0) {
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| 246 | pix_fmt = PIX_FMT_GRAY8;
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| 247 | } else {
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| 248 | av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown pixel format.\n");
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| 249 | return -1;
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| 250 | }
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| 251 | while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
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| 252 | break;
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| 253 | case 'I': // Interlace type
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| 254 | switch (*tokstart++){
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| 255 | case '?':
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| 256 | break;
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| 257 | case 'p':
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| 258 | s1->interlaced_frame=0;
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| 259 | break;
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| 260 | case 't':
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| 261 | s1->interlaced_frame=1;
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| 262 | s1->top_field_first=1;
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| 263 | break;
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| 264 | case 'b':
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| 265 | s1->interlaced_frame=1;
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| 266 | s1->top_field_first=0;
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| 267 | break;
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| 268 | case 'm':
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| 269 | av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed interlaced and non-interlaced frames.\n");
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| 270 | return -1;
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| 271 | default:
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| 272 | av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
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| 273 | return -1;
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| 274 | }
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| 275 | break;
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| 276 | case 'F': // Frame rate
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| 277 | sscanf(tokstart,"%d:%d",&raten,&rated); // 0:0 if unknown
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| 278 | while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
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| 279 | break;
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| 280 | case 'A': // Pixel aspect
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| 281 | sscanf(tokstart,"%d:%d",&aspectn,&aspectd); // 0:0 if unknown
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| 282 | while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
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| 283 | break;
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| 284 | case 'X': // Vendor extensions
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| 285 | if (strncmp("YSCSS=",tokstart,6)==0) {
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| 286 | // Older nonstandard pixel format representation
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| 287 | tokstart+=6;
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| 288 | if (strncmp("420JPEG",tokstart,7)==0)
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| 289 | alt_pix_fmt=PIX_FMT_YUV420P;
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| 290 | else if (strncmp("420MPEG2",tokstart,8)==0)
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| 291 | alt_pix_fmt=PIX_FMT_YUV420P;
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| 292 | else if (strncmp("420PALDV",tokstart,8)==0)
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| 293 | alt_pix_fmt=PIX_FMT_YUV420P;
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| 294 | else if (strncmp("411",tokstart,3)==0)
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| 295 | alt_pix_fmt=PIX_FMT_YUV411P;
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| 296 | else if (strncmp("422",tokstart,3)==0)
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| 297 | alt_pix_fmt=PIX_FMT_YUV422P;
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| 298 | else if (strncmp("444",tokstart,3)==0)
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| 299 | alt_pix_fmt=PIX_FMT_YUV444P;
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| 300 | }
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| 301 | while(tokstart<header_end&&*tokstart!=0x20) tokstart++;
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| 302 | break;
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| 303 | }
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| 304 | }
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| 305 |
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| 306 | if ((width == -1) || (height == -1)) {
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| 307 | av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
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| 308 | return -1;
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| 309 | }
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| 310 |
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| 311 | if (pix_fmt == PIX_FMT_NONE) {
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| 312 | if (alt_pix_fmt == PIX_FMT_NONE)
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| 313 | pix_fmt = PIX_FMT_YUV420P;
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| 314 | else
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| 315 | pix_fmt = alt_pix_fmt;
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| 316 | }
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| 317 |
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| 318 | if (raten == 0 && rated == 0) {
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| 319 | // Frame rate unknown
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| 320 | raten = 25;
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| 321 | rated = 1;
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| 322 | }
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| 323 |
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| 324 | if (aspectn == 0 && aspectd == 0) {
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| 325 | // Pixel aspect unknown
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| 326 | aspectd = 1;
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| 327 | }
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| 328 |
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| 329 | st = av_new_stream(s, 0);
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| 330 | st = s->streams[0];
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| 331 | st->codec->width = width;
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| 332 | st->codec->height = height;
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| 333 | av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);
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| 334 | av_set_pts_info(st, 64, rated, raten);
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| 335 | st->codec->pix_fmt = pix_fmt;
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| 336 | st->codec->codec_type = CODEC_TYPE_VIDEO;
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| 337 | st->codec->codec_id = CODEC_ID_RAWVIDEO;
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| 338 | st->codec->sample_aspect_ratio= (AVRational){aspectn, aspectd};
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| 339 |
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| 340 | return 0;
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| 341 | }
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| 342 |
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| 343 | static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
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| 344 | {
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| 345 | int i;
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| 346 | char header[MAX_FRAME_HEADER+1];
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| 347 | int packet_size, width, height;
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| 348 | AVStream *st = s->streams[0];
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| 349 | struct frame_attributes *s1 = s->priv_data;
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| 350 |
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| 351 | for (i=0; i<MAX_FRAME_HEADER; i++) {
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| 352 | header[i] = get_byte(&s->pb);
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| 353 | if (header[i] == '\n') {
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| 354 | header[i+1] = 0;
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| 355 | break;
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| 356 | }
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| 357 | }
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| 358 | if (i == MAX_FRAME_HEADER) return -1;
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| 359 | if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1;
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| 360 |
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| 361 | width = st->codec->width;
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| 362 | height = st->codec->height;
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| 363 |
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| 364 | packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
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| 365 | if (packet_size < 0)
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| 366 | return -1;
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| 367 |
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| 368 | if (av_get_packet(&s->pb, pkt, packet_size) != packet_size)
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| 369 | return AVERROR_IO;
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| 370 |
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| 371 | if (s->streams[0]->codec->coded_frame) {
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| 372 | s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
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| 373 | s->streams[0]->codec->coded_frame->top_field_first = s1->top_field_first;
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| 374 | }
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| 375 |
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| 376 | pkt->stream_index = 0;
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| 377 | return 0;
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| 378 | }
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| 379 |
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| 380 | static int yuv4_read_close(AVFormatContext *s)
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| 381 | {
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| 382 | return 0;
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| 383 | }
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| 384 |
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| 385 | static int yuv4_probe(AVProbeData *pd)
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| 386 | {
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| 387 | /* check file header */
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| 388 | if (pd->buf_size <= sizeof(Y4M_MAGIC))
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| 389 | return 0;
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| 390 | if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC)-1)==0)
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| 391 | return AVPROBE_SCORE_MAX;
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| 392 | else
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| 393 | return 0;
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| 394 | }
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| 395 |
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| 396 | AVInputFormat yuv4mpegpipe_demuxer = {
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|---|
| 397 | "yuv4mpegpipe",
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| 398 | "YUV4MPEG pipe format",
|
|---|
| 399 | sizeof(struct frame_attributes),
|
|---|
| 400 | yuv4_probe,
|
|---|
| 401 | yuv4_read_header,
|
|---|
| 402 | yuv4_read_packet,
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|---|
| 403 | yuv4_read_close,
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|---|
| 404 | .extensions = "y4m"
|
|---|
| 405 | };
|
|---|
| 406 |
|
|---|
| 407 | int yuv4mpeg_init(void)
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|---|
| 408 | {
|
|---|
| 409 | av_register_input_format(&yuv4mpegpipe_demuxer);
|
|---|
| 410 | #ifdef CONFIG_MUXERS
|
|---|
| 411 | av_register_output_format(&yuv4mpegpipe_muxer);
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|---|
| 412 | #endif //CONFIG_MUXERS
|
|---|
| 413 | return 0;
|
|---|
| 414 | }
|
|---|
| 415 |
|
|---|
