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257 lines
6.9 KiB
257 lines
6.9 KiB
/* |
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* YUV4MPEG format |
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* Copyright (c) 2001, 2002, 2003 Fabrice Bellard. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "avformat.h" |
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#define Y4M_MAGIC "YUV4MPEG2" |
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#define Y4M_FRAME_MAGIC "FRAME" |
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#define Y4M_LINE_MAX 256 |
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#ifdef CONFIG_ENCODERS |
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static int yuv4_generate_header(AVFormatContext *s, char* buf) |
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{ |
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AVStream *st; |
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int width, height; |
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int raten, rated, aspectn, aspectd, n; |
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char inter; |
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st = s->streams[0]; |
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width = st->codec.width; |
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height = st->codec.height; |
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av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1); |
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aspectn = st->codec.sample_aspect_ratio.num; |
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aspectd = st->codec.sample_aspect_ratio.den; |
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inter = 'p'; /* progressive is the default */ |
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if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) { |
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inter = st->codec.coded_frame->top_field_first ? 't' : 'b'; |
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} |
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/* construct stream header, if this is the first frame */ |
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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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Y4M_MAGIC, |
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width, |
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height, |
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raten, rated, |
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inter, |
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aspectn, aspectd, |
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(st->codec.pix_fmt == PIX_FMT_YUV411P) ? " C411 XYSCSS=411" : " C420mpeg2 XYSCSS=420MPEG2"); |
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return n; |
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} |
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static int yuv4_write_packet(AVFormatContext *s, int stream_index, |
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const uint8_t *buf, int size, int64_t pts) |
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{ |
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AVStream *st = s->streams[stream_index]; |
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ByteIOContext *pb = &s->pb; |
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AVPicture *picture; |
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int* first_pkt = s->priv_data; |
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int width, height; |
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int i, m; |
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char buf2[Y4M_LINE_MAX+1]; |
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char buf1[20]; |
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uint8_t *ptr, *ptr1, *ptr2; |
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picture = (AVPicture *)buf; |
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/* for the first packet we have to output the header as well */ |
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if (*first_pkt) { |
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*first_pkt = 0; |
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if (yuv4_generate_header(s, buf2) < 0) { |
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av_log(s, AV_LOG_ERROR, "Error. YUV4MPEG stream header write failed.\n"); |
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return -EIO; |
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} else { |
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put_buffer(pb, buf2, strlen(buf2)); |
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} |
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} |
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/* construct frame header */ |
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m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC); |
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put_buffer(pb, buf1, strlen(buf1)); |
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width = st->codec.width; |
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height = st->codec.height; |
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ptr = picture->data[0]; |
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for(i=0;i<height;i++) { |
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put_buffer(pb, ptr, width); |
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ptr += picture->linesize[0]; |
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} |
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height >>= 1; |
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width >>= 1; |
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ptr1 = picture->data[1]; |
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ptr2 = picture->data[2]; |
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for(i=0;i<height;i++) { /* Cb */ |
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put_buffer(pb, ptr1, width); |
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ptr1 += picture->linesize[1]; |
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} |
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for(i=0;i<height;i++) { /* Cr */ |
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put_buffer(pb, ptr2, width); |
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ptr2 += picture->linesize[2]; |
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} |
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put_flush_packet(pb); |
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return 0; |
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} |
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static int yuv4_write_header(AVFormatContext *s) |
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{ |
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int* first_pkt = s->priv_data; |
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if (s->nb_streams != 1) |
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return -EIO; |
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if (s->streams[0]->codec.pix_fmt == PIX_FMT_YUV411P) { |
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av_log(s, AV_LOG_ERROR, "Warning: generating non-standard 4:1:1 YUV stream, some mjpegtools might not work.\n"); |
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} |
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else if (s->streams[0]->codec.pix_fmt != PIX_FMT_YUV420P) { |
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av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles 4:2:0, 4:1:1 YUV data. Use -pix_fmt to select one.\n"); |
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return -EIO; |
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} |
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*first_pkt = 1; |
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return 0; |
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} |
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static int yuv4_write_trailer(AVFormatContext *s) |
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{ |
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return 0; |
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} |
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AVOutputFormat yuv4mpegpipe_oformat = { |
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"yuv4mpegpipe", |
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"YUV4MPEG pipe format", |
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"", |
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"yuv4mpeg", |
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sizeof(int), |
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CODEC_ID_NONE, |
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CODEC_ID_RAWVIDEO, |
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yuv4_write_header, |
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yuv4_write_packet, |
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yuv4_write_trailer, |
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.flags = AVFMT_RAWPICTURE, |
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}; |
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#endif //CONFIG_ENCODERS |
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/* Header size increased to allow room for optional flags */ |
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#define MAX_YUV4_HEADER 80 |
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#define MAX_FRAME_HEADER 10 |
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static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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char header[MAX_YUV4_HEADER+1]; |
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int i; |
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ByteIOContext *pb = &s->pb; |
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int width, height, raten, rated, aspectn, aspectd; |
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char lacing; |
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AVStream *st; |
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for (i=0; i<MAX_YUV4_HEADER; i++) { |
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header[i] = get_byte(pb); |
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if (header[i] == '\n') { |
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header[i+1] = 0; |
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break; |
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} |
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} |
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if (i == MAX_YUV4_HEADER) return -1; |
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if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1; |
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sscanf(header+strlen(Y4M_MAGIC), " W%d H%d F%d:%d I%c A%d:%d", |
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&width, &height, &raten, &rated, &lacing, &aspectn, &aspectd); |
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st = av_new_stream(s, 0); |
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st = s->streams[0]; |
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st->codec.width = width; |
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st->codec.height = height; |
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av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1); |
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st->codec.frame_rate = raten; |
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st->codec.frame_rate_base = rated; |
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st->codec.pix_fmt = PIX_FMT_YUV420P; |
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st->codec.codec_type = CODEC_TYPE_VIDEO; |
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st->codec.codec_id = CODEC_ID_RAWVIDEO; |
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st->codec.sample_aspect_ratio= (AVRational){aspectn, aspectd}; |
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return 0; |
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} |
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static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int i; |
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char header[MAX_FRAME_HEADER+1]; |
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int packet_size, ret, width, height; |
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AVStream *st = s->streams[0]; |
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for (i=0; i<MAX_FRAME_HEADER; i++) { |
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header[i] = get_byte(&s->pb); |
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if (header[i] == '\n') { |
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header[i+1] = 0; |
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break; |
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} |
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} |
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if (i == MAX_FRAME_HEADER) return -1; |
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if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return -1; |
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width = st->codec.width; |
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height = st->codec.height; |
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packet_size = avpicture_get_size(st->codec.pix_fmt, width, height); |
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if (packet_size < 0) |
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av_abort(); |
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if (av_new_packet(pkt, packet_size) < 0) |
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return -EIO; |
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pkt->stream_index = 0; |
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ret = get_buffer(&s->pb, pkt->data, pkt->size); |
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if (ret != pkt->size) { |
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av_free_packet(pkt); |
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return -EIO; |
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} else { |
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return 0; |
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} |
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} |
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static int yuv4_read_close(AVFormatContext *s) |
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{ |
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return 0; |
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} |
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AVInputFormat yuv4mpegpipe_iformat = { |
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"yuv4mpegpipe", |
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"YUV4MPEG pipe format", |
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0, |
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NULL, |
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yuv4_read_header, |
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yuv4_read_packet, |
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yuv4_read_close, |
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.extensions = "yuv4mpeg" |
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}; |
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int yuv4mpeg_init(void) |
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{ |
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av_register_input_format(&yuv4mpegpipe_iformat); |
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#ifdef CONFIG_ENCODERS |
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av_register_output_format(&yuv4mpegpipe_oformat); |
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#endif //CONFIG_ENCODERS |
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return 0; |
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} |
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