yuv4mpeg: split the demuxer and muxer into separate files

1 files changed, 186 insertions, 0 deletions

diff --git a/libavformat/yuv4mpegenc.c b/libavformat/yuv4mpegenc.c
new file mode 100644
index 0000000000..ed1ffea87d
--- /dev/null
+++ b/libavformat/yuv4mpegenc.c
@@ -0,0 +1,186 @@
+/*
+ * YUV4MPEG muxer
+ * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/pixdesc.h"
+#include "avformat.h"
+#include "internal.h"
+#include "yuv4mpeg.h"
+
+#define Y4M_LINE_MAX 256
+
+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 AV_PIX_FMT_GRAY8:
+        colorspace = " Cmono";
+        break;
+    case AV_PIX_FMT_YUV411P:
+        colorspace = " C411 XYSCSS=411";
+        break;
+    case AV_PIX_FMT_YUV420P:
+        switch (st->codec->chroma_sample_location) {
+        case AVCHROMA_LOC_TOPLEFT: colorspace = " C420paldv XYSCSS=420PALDV"; break;
+        case AVCHROMA_LOC_LEFT:    colorspace = " C420mpeg2 XYSCSS=420MPEG2"; break;
+        default:                   colorspace = " C420jpeg XYSCSS=420JPEG";   break;
+        }
+        break;
+    case AV_PIX_FMT_YUV422P:
+        colorspace = " C422 XYSCSS=422";
+        break;
+    case AV_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];
+    AVIOContext *pb = s->pb;
+    AVPicture *picture;
+    int* first_pkt = s->priv_data;
+    int width, height, h_chroma_shift, v_chroma_shift;
+    int i;
+    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 {
+            avio_write(pb, buf2, strlen(buf2));
+        }
+    }
+
+    /* construct frame header */
+
+    snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
+    avio_write(pb, buf1, strlen(buf1));
+
+    width  = st->codec->width;
+    height = st->codec->height;
+
+    ptr = picture->data[0];
+    for (i = 0; i < height; i++) {
+        avio_write(pb, ptr, width);
+        ptr += picture->linesize[0];
+    }
+
+    if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8) {
+        // Adjust for smaller Cb and Cr planes
+        av_pix_fmt_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
+                                         &v_chroma_shift);
+        // Shift right, rounding up
+        width  = -(-width  >> h_chroma_shift);
+        height = -(-height >> v_chroma_shift);
+
+        ptr1 = picture->data[1];
+        ptr2 = picture->data[2];
+        for (i = 0; i < height; i++) {     /* Cb */
+            avio_write(pb, ptr1, width);
+            ptr1 += picture->linesize[1];
+        }
+        for (i = 0; i < height; i++) {     /* Cr */
+            avio_write(pb, ptr2, width);
+            ptr2 += picture->linesize[2];
+        }
+    }
+    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->codec_id != AV_CODEC_ID_RAWVIDEO) {
+        av_log(s, AV_LOG_ERROR, "ERROR: Only rawvideo supported.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (s->streams[0]->codec->pix_fmt == AV_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 != AV_PIX_FMT_YUV420P) &&
+               (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_YUV422P) &&
+               (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_GRAY8)   &&
+               (s->streams[0]->codec->pix_fmt != AV_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 ff_yuv4mpegpipe_muxer = {
+    .name              = "yuv4mpegpipe",
+    .long_name         = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
+    .mime_type         = "",
+    .extensions        = "y4m",
+    .priv_data_size    = sizeof(int),
+    .audio_codec       = AV_CODEC_ID_NONE,
+    .video_codec       = AV_CODEC_ID_RAWVIDEO,
+    .write_header      = yuv4_write_header,
+    .write_packet      = yuv4_write_packet,
+    .flags             = AVFMT_RAWPICTURE,
+};