/* * 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" #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_YUV411P: colorspace = " C411 XYSCSS=411"; break; case PIX_FMT_YUV420P: colorspace = (st->codec->chroma_sample_location == AVCHROMA_LOC_TOPLEFT)?" C420paldv XYSCSS=420PALDV": (st->codec->chroma_sample_location == AVCHROMA_LOC_LEFT) ?" C420mpeg2 XYSCSS=420MPEG2": " C420jpeg XYSCSS=420JPEG"; break; case PIX_FMT_YUV422P: colorspace = " C422 XYSCSS=422"; break; case PIX_FMT_YUV444P: colorspace = " C444 XYSCSS=444"; 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]; ByteIOContext *pb = s->pb; AVPicture *picture; int* first_pkt = s->priv_data; int width, height, h_chroma_shift, v_chroma_shift; int i, m; char buf2[Y4M_LINE_MAX+1]; char buf1[20]; uint8_t *ptr, *ptr1, *ptr2; picture = (AVPicture *)pkt->data; /* 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 { put_buffer(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; ptr = picture->data[0]; for(i=0;i<height;i++) { put_buffer(pb, ptr, width); ptr += picture->linesize[0]; } if (st->codec->pix_fmt != PIX_FMT_GRAY8){ // 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 */ put_buffer(pb, ptr1, width); ptr1 += picture->linesize[1]; } for(i=0;i<height;i++) { /* Cr */ put_buffer(pb, ptr2, width); ptr2 += picture->linesize[2]; } } put_flush_packet(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->pix_fmt == PIX_FMT_YUV411P) { av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV stream, some mjpegtools might not work.\n"); } else if ((s->streams[0]->codec->pix_fmt != PIX_FMT_YUV420P) && (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV422P) && (s->streams[0]->codec->pix_fmt != PIX_FMT_GRAY8) && (s->streams[0]->codec->pix_fmt != PIX_FMT_YUV444P)) { 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"); return AVERROR(EIO); } *first_pkt = 1; return 0; } AVOutputFormat yuv4mpegpipe_muxer = { "yuv4mpegpipe", NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"), "", "y4m", sizeof(int), CODEC_ID_NONE, CODEC_ID_RAWVIDEO, yuv4_write_header, 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, AVFormatParameters *ap) { char header[MAX_YUV4_HEADER+10]; // Include headroom for the longest option char *tokstart,*tokend,*header_end; int i; ByteIOContext *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] = get_byte(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("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("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("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 = av_new_stream(s, 0); if(!st) return AVERROR(ENOMEM); st->codec->width = width; st->codec->height = height; av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1); av_set_pts_info(st, 64, rated, raten); st->codec->pix_fmt = pix_fmt; st->codec->codec_type = CODEC_TYPE_VIDEO; st->codec->codec_id = 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] = get_byte(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 (s->streams[0]->codec->coded_frame) { s->streams[0]->codec->coded_frame->interlaced_frame = s1->interlaced_frame; s->streams[0]->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 yuv4mpegpipe_demuxer = { "yuv4mpegpipe", NULL_IF_CONFIG_SMALL("YUV4MPEG pipe format"), sizeof(struct frame_attributes), yuv4_probe, yuv4_read_header, yuv4_read_packet, .extensions = "y4m" }; #endif