mirror of https://github.com/FFmpeg/FFmpeg.git
Anton Khirnov
11 years ago
parent
3ef6c5264b
commit
e4dc1000d7
4 changed files with 220 additions and 174 deletions
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/*
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* YUV4MPEG common definitions |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav 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 Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVFORMAT_YUV4MPEG_H |
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#define AVFORMAT_YUV4MPEG_H |
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#define Y4M_MAGIC "YUV4MPEG2" |
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#define Y4M_FRAME_MAGIC "FRAME" |
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#endif /* AVFORMAT_YUV4MPEG_H */ |
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@ -0,0 +1,186 @@ |
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/*
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* YUV4MPEG muxer |
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* Copyright (c) 2001, 2002, 2003 Fabrice Bellard |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav 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 Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/pixdesc.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "yuv4mpeg.h" |
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#define Y4M_LINE_MAX 256 |
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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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const char *colorspace = ""; |
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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->time_base.den, |
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st->codec->time_base.num, (1UL << 31) - 1); |
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aspectn = st->sample_aspect_ratio.num; |
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aspectd = st->sample_aspect_ratio.den; |
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if (aspectn == 0 && aspectd == 1) |
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aspectd = 0; // 0:0 means unknown
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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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switch (st->codec->pix_fmt) { |
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case AV_PIX_FMT_GRAY8: |
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colorspace = " Cmono"; |
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break; |
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case AV_PIX_FMT_YUV411P: |
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colorspace = " C411 XYSCSS=411"; |
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break; |
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case AV_PIX_FMT_YUV420P: |
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switch (st->codec->chroma_sample_location) { |
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case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break; |
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case AVCHROMA_LOC_LEFT: colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break; |
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default: colorspace = " C420jpeg XYSCSS=420JPEG"; break; |
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} |
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break; |
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case AV_PIX_FMT_YUV422P: |
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colorspace = " C422 XYSCSS=422"; |
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break; |
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case AV_PIX_FMT_YUV444P: |
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colorspace = " C444 XYSCSS=444"; |
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break; |
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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, width, height, raten, rated, inter, |
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aspectn, aspectd, colorspace); |
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return n; |
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} |
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static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVStream *st = s->streams[pkt->stream_index]; |
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AVIOContext *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, h_chroma_shift, v_chroma_shift; |
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int i; |
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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 *)pkt->data; |
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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, |
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"Error. YUV4MPEG stream header write failed.\n"); |
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return AVERROR(EIO); |
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} else { |
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avio_write(pb, buf2, strlen(buf2)); |
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} |
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} |
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/* construct frame header */ |
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snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC); |
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avio_write(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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avio_write(pb, ptr, width); |
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ptr += picture->linesize[0]; |
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} |
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if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8) { |
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// Adjust for smaller Cb and Cr planes
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av_pix_fmt_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift, |
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&v_chroma_shift); |
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// Shift right, rounding up
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width = -(-width >> h_chroma_shift); |
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height = -(-height >> v_chroma_shift); |
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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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avio_write(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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avio_write(pb, ptr2, width); |
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ptr2 += picture->linesize[2]; |
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} |
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} |
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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 AVERROR(EIO); |
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if (s->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) { |
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av_log(s, AV_LOG_ERROR, "ERROR: Only rawvideo supported.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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if (s->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUV411P) { |
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av_log(s, AV_LOG_ERROR, "Warning: generating rarely used 4:1:1 YUV " |
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"stream, some mjpegtools might not work.\n"); |
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} else if ((s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV420P) && |
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(s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV422P) && |
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(s->streams[0]->codec->pix_fmt != AV_PIX_FMT_GRAY8) && |
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(s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV444P)) { |
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av_log(s, AV_LOG_ERROR, "ERROR: yuv4mpeg only handles yuv444p, " |
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"yuv422p, yuv420p, yuv411p and gray pixel formats. " |
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"Use -pix_fmt to select one.\n"); |
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return AVERROR(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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AVOutputFormat ff_yuv4mpegpipe_muxer = { |
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.name = "yuv4mpegpipe", |
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.long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"), |
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.mime_type = "", |
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.extensions = "y4m", |
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.priv_data_size = sizeof(int), |
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.audio_codec = AV_CODEC_ID_NONE, |
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.video_codec = AV_CODEC_ID_RAWVIDEO, |
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.write_header = yuv4_write_header, |
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.write_packet = yuv4_write_packet, |
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.flags = AVFMT_RAWPICTURE, |
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}; |
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