yuv4mpeg: split the demuxer and muxer into separate files
authorAnton Khirnov <anton@khirnov.net>
Sat, 3 May 2014 09:04:50 +0000 (11:04 +0200)
committerAnton Khirnov <anton@khirnov.net>
Sun, 18 May 2014 08:21:31 +0000 (10:21 +0200)
libavformat/Makefile
libavformat/yuv4mpeg.c [deleted file]
libavformat/yuv4mpeg.h [new file with mode: 0644]
libavformat/yuv4mpegdec.c [new file with mode: 0644]
libavformat/yuv4mpegenc.c [new file with mode: 0644]

index 2a68120..ae3bcbd 100644 (file)
@@ -355,8 +355,8 @@ OBJS-$(CONFIG_XA_DEMUXER)                += xa.o
 OBJS-$(CONFIG_XMV_DEMUXER)               += xmv.o
 OBJS-$(CONFIG_XWMA_DEMUXER)              += xwma.o
 OBJS-$(CONFIG_YOP_DEMUXER)               += yop.o
-OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER)        += yuv4mpeg.o
-OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER)      += yuv4mpeg.o
+OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER)        += yuv4mpegenc.o
+OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER)      += yuv4mpegdec.o
 
 # external libraries
 OBJS-$(CONFIG_LIBRTMP)                   += librtmp.o
diff --git a/libavformat/yuv4mpeg.c b/libavformat/yuv4mpeg.c
deleted file mode 100644 (file)
index f793a0e..0000000
+++ /dev/null
@@ -1,440 +0,0 @@
-/*
- * YUV4MPEG format
- * 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"
-
-#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 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,
-};
-#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)
-{
-    char header[MAX_YUV4_HEADER + 10];  // Include headroom for
-                                        // the longest option
-    char *tokstart, *tokend, *header_end;
-    int i;
-    AVIOContext *pb = s->pb;
-    int width = -1, height  = -1, raten   = 0,
-        rated =  0, aspectn =  0, aspectd = 0;
-    enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_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] = avio_r8(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 = AV_PIX_FMT_YUV420P;
-                chroma_sample_location = AVCHROMA_LOC_CENTER;
-            } else if (strncmp("420mpeg2", tokstart, 8) == 0) {
-                pix_fmt = AV_PIX_FMT_YUV420P;
-                chroma_sample_location = AVCHROMA_LOC_LEFT;
-            } else if (strncmp("420paldv", tokstart, 8) == 0) {
-                pix_fmt = AV_PIX_FMT_YUV420P;
-                chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
-            } else if (strncmp("420", tokstart, 3) == 0) {
-                pix_fmt = AV_PIX_FMT_YUV420P;
-                chroma_sample_location = AVCHROMA_LOC_CENTER;
-            } else if (strncmp("411", tokstart, 3) == 0)
-                pix_fmt = AV_PIX_FMT_YUV411P;
-            else if (strncmp("422", tokstart, 3) == 0)
-                pix_fmt = AV_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 = AV_PIX_FMT_YUV444P;
-            else if (strncmp("mono", tokstart, 4) == 0) {
-                pix_fmt = AV_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 = AV_PIX_FMT_YUV420P;
-                else if (strncmp("420MPEG2", tokstart, 8) == 0)
-                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
-                else if (strncmp("420PALDV", tokstart, 8) == 0)
-                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
-                else if (strncmp("411", tokstart, 3) == 0)
-                    alt_pix_fmt = AV_PIX_FMT_YUV411P;
-                else if (strncmp("422", tokstart, 3) == 0)
-                    alt_pix_fmt = AV_PIX_FMT_YUV422P;
-                else if (strncmp("444", tokstart, 3) == 0)
-                    alt_pix_fmt = AV_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 == AV_PIX_FMT_NONE) {
-        if (alt_pix_fmt == AV_PIX_FMT_NONE)
-            pix_fmt = AV_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 = avformat_new_stream(s, NULL);
-    if (!st)
-        return AVERROR(ENOMEM);
-    st->codec->width  = width;
-    st->codec->height = height;
-    av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
-    avpriv_set_pts_info(st, 64, rated, raten);
-    st->avg_frame_rate                = av_inv_q(st->time_base);
-    st->codec->pix_fmt                = pix_fmt;
-    st->codec->codec_type             = AVMEDIA_TYPE_VIDEO;
-    st->codec->codec_id               = AV_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, ret;
-    AVStream *st = s->streams[0];
-    struct frame_attributes *s1 = s->priv_data;
-
-    for (i = 0; i < MAX_FRAME_HEADER; i++) {
-        header[i] = avio_r8(s->pb);
-        if (header[i] == '\n') {
-            header[i + 1] = 0;
-            break;
-        }
-    }
-    if (s->pb->error)
-        return s->pb->error;
-    else if (s->pb->eof_reached)
-        return AVERROR_EOF;
-    else if (i == MAX_FRAME_HEADER)
-        return AVERROR_INVALIDDATA;
-
-    if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
-        return AVERROR_INVALIDDATA;
-
-    width  = st->codec->width;
-    height = st->codec->height;
-
-    packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
-    if (packet_size < 0)
-        return packet_size;
-
-    ret = av_get_packet(s->pb, pkt, packet_size);
-    if (ret < 0)
-        return ret;
-    else if (ret != packet_size)
-        return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
-
-    if (st->codec->coded_frame) {
-        st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
-        st->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 ff_yuv4mpegpipe_demuxer = {
-    .name           = "yuv4mpegpipe",
-    .long_name      = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
-    .priv_data_size = sizeof(struct frame_attributes),
-    .read_probe     = yuv4_probe,
-    .read_header    = yuv4_read_header,
-    .read_packet    = yuv4_read_packet,
-    .extensions     = "y4m",
-};
-#endif
diff --git a/libavformat/yuv4mpeg.h b/libavformat/yuv4mpeg.h
new file mode 100644 (file)
index 0000000..7891ed6
--- /dev/null
@@ -0,0 +1,27 @@
+/*
+ * YUV4MPEG common definitions
+ *
+ * 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
+ */
+
+#ifndef AVFORMAT_YUV4MPEG_H
+#define AVFORMAT_YUV4MPEG_H
+
+#define Y4M_MAGIC "YUV4MPEG2"
+#define Y4M_FRAME_MAGIC "FRAME"
+
+#endif /* AVFORMAT_YUV4MPEG_H */
diff --git a/libavformat/yuv4mpegdec.c b/libavformat/yuv4mpegdec.c
new file mode 100644 (file)
index 0000000..fb71dcb
--- /dev/null
@@ -0,0 +1,273 @@
+/*
+ * YUV4MPEG demuxer
+ * 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 "avformat.h"
+#include "internal.h"
+#include "yuv4mpeg.h"
+
+/* Header size increased to allow room for optional flags */
+#define MAX_YUV4_HEADER 80
+#define MAX_FRAME_HEADER 80
+
+struct frame_attributes {
+    int interlaced_frame;
+    int top_field_first;
+};
+
+static int yuv4_read_header(AVFormatContext *s)
+{
+    char header[MAX_YUV4_HEADER + 10];  // Include headroom for
+                                        // the longest option
+    char *tokstart, *tokend, *header_end;
+    int i;
+    AVIOContext *pb = s->pb;
+    int width = -1, height  = -1, raten   = 0,
+        rated =  0, aspectn =  0, aspectd = 0;
+    enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_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] = avio_r8(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 = AV_PIX_FMT_YUV420P;
+                chroma_sample_location = AVCHROMA_LOC_CENTER;
+            } else if (strncmp("420mpeg2", tokstart, 8) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P;
+                chroma_sample_location = AVCHROMA_LOC_LEFT;
+            } else if (strncmp("420paldv", tokstart, 8) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P;
+                chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
+            } else if (strncmp("420", tokstart, 3) == 0) {
+                pix_fmt = AV_PIX_FMT_YUV420P;
+                chroma_sample_location = AVCHROMA_LOC_CENTER;
+            } else if (strncmp("411", tokstart, 3) == 0)
+                pix_fmt = AV_PIX_FMT_YUV411P;
+            else if (strncmp("422", tokstart, 3) == 0)
+                pix_fmt = AV_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 = AV_PIX_FMT_YUV444P;
+            else if (strncmp("mono", tokstart, 4) == 0) {
+                pix_fmt = AV_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 = AV_PIX_FMT_YUV420P;
+                else if (strncmp("420MPEG2", tokstart, 8) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
+                else if (strncmp("420PALDV", tokstart, 8) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV420P;
+                else if (strncmp("411", tokstart, 3) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV411P;
+                else if (strncmp("422", tokstart, 3) == 0)
+                    alt_pix_fmt = AV_PIX_FMT_YUV422P;
+                else if (strncmp("444", tokstart, 3) == 0)
+                    alt_pix_fmt = AV_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 == AV_PIX_FMT_NONE) {
+        if (alt_pix_fmt == AV_PIX_FMT_NONE)
+            pix_fmt = AV_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 = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    st->codec->width  = width;
+    st->codec->height = height;
+    av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
+    avpriv_set_pts_info(st, 64, rated, raten);
+    st->avg_frame_rate                = av_inv_q(st->time_base);
+    st->codec->pix_fmt                = pix_fmt;
+    st->codec->codec_type             = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id               = AV_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, ret;
+    AVStream *st = s->streams[0];
+    struct frame_attributes *s1 = s->priv_data;
+
+    for (i = 0; i < MAX_FRAME_HEADER; i++) {
+        header[i] = avio_r8(s->pb);
+        if (header[i] == '\n') {
+            header[i + 1] = 0;
+            break;
+        }
+    }
+    if (s->pb->error)
+        return s->pb->error;
+    else if (s->pb->eof_reached)
+        return AVERROR_EOF;
+    else if (i == MAX_FRAME_HEADER)
+        return AVERROR_INVALIDDATA;
+
+    if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
+        return AVERROR_INVALIDDATA;
+
+    width  = st->codec->width;
+    height = st->codec->height;
+
+    packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
+    if (packet_size < 0)
+        return packet_size;
+
+    ret = av_get_packet(s->pb, pkt, packet_size);
+    if (ret < 0)
+        return ret;
+    else if (ret != packet_size)
+        return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
+
+    if (st->codec->coded_frame) {
+        st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
+        st->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;
+}
+
+AVInputFormat ff_yuv4mpegpipe_demuxer = {
+    .name           = "yuv4mpegpipe",
+    .long_name      = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
+    .priv_data_size = sizeof(struct frame_attributes),
+    .read_probe     = yuv4_probe,
+    .read_header    = yuv4_read_header,
+    .read_packet    = yuv4_read_packet,
+    .extensions     = "y4m",
+};
diff --git a/libavformat/yuv4mpegenc.c b/libavformat/yuv4mpegenc.c
new file mode 100644 (file)
index 0000000..ed1ffea
--- /dev/null
@@ -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,
+};