yuv4mpeg: split the demuxer and muxer into separate files

1 files changed, 273 insertions, 0 deletions

diff --git a/libavformat/yuv4mpegdec.c b/libavformat/yuv4mpegdec.c
new file mode 100644
index 0000000000..fb71dcb7e4
--- /dev/null
+++ b/libavformat/yuv4mpegdec.c
@@ -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",
+};