/* * YUV4MPEG format * Copyright (c) 2001, 2002, 2003 Fabrice Bellard. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "avformat.h" #define Y4M_MAGIC "YUV4MPEG2" #define Y4M_FRAME_MAGIC "FRAME" #define Y4M_LINE_MAX 256 #ifdef CONFIG_ENCODERS static int yuv4_generate_header(AVFormatContext *s, char* buf) { AVStream *st; int width, height; int raten, rated, aspectn, aspectd, n; char inter; st = s->streams[0]; width = st->codec.width; height = st->codec.height; av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1); aspectn = st->codec.sample_aspect_ratio.num; aspectd = st->codec.sample_aspect_ratio.den; inter = 'p'; /* progressive is the default */ if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) { inter = st->codec.coded_frame->top_field_first ? 't' : 'b'; } /* construct stream header, if this is the first frame */ n = snprintf(buf, Y4M_LINE_MAX, "%s W%d H%d F%d:%d I%c A%d:%d%s\n", Y4M_MAGIC, width, height, raten, rated, inter, aspectn, aspectd, (st->codec.pix_fmt == PIX_FMT_YUV411P) ? " XYSCSS=411" : ""); return n; } static int yuv4_write_packet(AVFormatContext *s, int stream_index, const uint8_t *buf, int size, int64_t pts) { AVStream *st = s->streams[stream_index]; ByteIOContext *pb = &s->pb; AVPicture *picture; int* first_pkt = s->priv_data; int width, height; int i, m; char buf2[Y4M_LINE_MAX+1]; char buf1[20]; uint8_t *ptr, *ptr1, *ptr2; picture = (AVPicture *)buf; /* for the first packet we have to output the header as well */ if (*first_pkt) { *first_pkt = 0; if (yuv4_generate_header(s, buf2) < 0) { fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n"); return -EIO; } else { put_buffer(pb, buf2, strlen(buf2)); } } /* 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]; } height >>= 1; width >>= 1; ptr1 = picture->data[1]; ptr2 = picture->data[2]; for(i=0;i<height;i++) { /* Cb */ put_buffer(pb, ptr1, width); ptr1 += picture->linesize[1]; } for(i=0;i<height;i++) { /* 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 -EIO; if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) { fprintf(stderr, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n"); } else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) { fprintf(stderr, "ERROR: yuv4mpeg only handles 4:2:0, 4:1:1 YUV data. Use -pix_fmt to select one.\n"); return -EIO; } *first_pkt = 1; return 0; } static int yuv4_write_trailer(AVFormatContext *s) { return 0; } AVOutputFormat yuv4mpegpipe_oformat = { "yuv4mpegpipe", "YUV4MPEG pipe format", "", "yuv4mpeg", sizeof(int), CODEC_ID_NONE, CODEC_ID_RAWVIDEO, yuv4_write_header, yuv4_write_packet, yuv4_write_trailer, .flags = AVFMT_RAWPICTURE, }; #endif //CONFIG_ENCODERS /* Header size increased to allow room for optional flags */ #define MAX_YUV4_HEADER 80 #define MAX_FRAME_HEADER 10 static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap) { char header[MAX_YUV4_HEADER+1]; int i; ByteIOContext *pb = &s->pb; int width, height, raten, rated, aspectn, aspectd; char lacing; AVStream *st; for (i=0; i<MAX_YUV4_HEADER; i++) { header[i] = get_byte(pb); if (header[i] == '\n') { header[i+1] = 0; break; } } if (i == MAX_YUV4_HEADER) return -1; if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1; sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d", &width, &height, &raten, &rated, &lacing, &aspectn, &aspectd); st = av_new_stream(s, 0); st = s->streams[0]; st->codec.width = width; st->codec.height = height; av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1); st->codec.frame_rate = raten; st->codec.frame_rate_base = rated; st->codec.pix_fmt = PIX_FMT_YUV420P; st->codec.codec_type = CODEC_TYPE_VIDEO; st->codec.codec_id = CODEC_ID_RAWVIDEO; st->codec.sample_aspect_ratio= (AVRational){aspectn, aspectd}; return 0; } static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt) { int i; char header[MAX_FRAME_HEADER+1]; int packet_size, ret, width, height; AVStream *st = s->streams[0]; for (i=0; i<MAX_FRAME_HEADER; i++) { header[i] = get_byte(&s->pb); if (header[i] == '\n') { header[i+1] = 0; break; } } 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) av_abort(); if (av_new_packet(pkt, packet_size) < 0) return -EIO; pkt->stream_index = 0; ret = get_buffer(&s->pb, pkt->data, pkt->size); if (ret != pkt->size) { av_free_packet(pkt); return -EIO; } else { return 0; } } static int yuv4_read_close(AVFormatContext *s) { return 0; } AVInputFormat yuv4mpegpipe_iformat = { "yuv4mpegpipe", "YUV4MPEG pipe format", 0, NULL, yuv4_read_header, yuv4_read_packet, yuv4_read_close, .extensions = "yuv4mpeg" }; int yuv4mpeg_init(void) { av_register_input_format(&yuv4mpegpipe_iformat); #ifdef CONFIG_ENCODERS av_register_output_format(&yuv4mpegpipe_oformat); #endif //CONFIG_ENCODERS return 0; }