lavfi: rename vsrc_buffer.c to buffersrc.c

Most of the code will be shared for both audio and video version.

1 files changed, 215 insertions, 0 deletions

diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
new file mode 100644
index 0000000000..1ace368413
--- /dev/null
+++ b/libavfilter/buffersrc.c
@@ -0,0 +1,215 @@
+/*
+ * Copyright (c) 2008 Vitor Sessak
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * memory buffer source filter
+ */
+
+#include "avfilter.h"
+#include "buffersrc.h"
+#include "vsrc_buffer.h"
+#include "libavutil/fifo.h"
+#include "libavutil/imgutils.h"
+
+typedef struct {
+    AVFifoBuffer     *fifo;
+    int               h, w;
+    enum PixelFormat  pix_fmt;
+    AVRational        time_base;     ///< time_base to set in the output link
+    AVRational        pixel_aspect;
+    int eof;
+} BufferSourceContext;
+
+#define CHECK_PARAM_CHANGE(s, c, width, height, format)\
+    if (c->w != width || c->h != height || c->pix_fmt != format) {\
+        av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
+        return AVERROR(EINVAL);\
+    }
+
+int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
+                             int64_t pts, AVRational pixel_aspect)
+{
+    BufferSourceContext *c = buffer_filter->priv;
+    AVFilterBufferRef *buf;
+    int ret;
+
+    if (!frame) {
+        c->eof = 1;
+        return 0;
+    } else if (c->eof)
+        return AVERROR(EINVAL);
+
+    if (!av_fifo_space(c->fifo) &&
+        (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
+                                         sizeof(buf))) < 0)
+        return ret;
+
+    CHECK_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height, frame->format);
+
+    buf = avfilter_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
+                                    c->w, c->h);
+    av_image_copy(buf->data, buf->linesize, frame->data, frame->linesize,
+                  c->pix_fmt, c->w, c->h);
+
+    avfilter_copy_frame_props(buf, frame);
+    buf->pts                    = pts;
+    buf->video->pixel_aspect    = pixel_aspect;
+
+    if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
+        avfilter_unref_buffer(buf);
+        return ret;
+    }
+
+    return 0;
+}
+
+int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
+{
+    BufferSourceContext *c = s->priv;
+    int ret;
+
+    if (!buf) {
+        c->eof = 1;
+        return 0;
+    } else if (c->eof)
+        return AVERROR(EINVAL);
+
+    if (!av_fifo_space(c->fifo) &&
+        (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
+                                         sizeof(buf))) < 0)
+        return ret;
+
+    CHECK_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
+
+    if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0)
+        return ret;
+
+    return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+    BufferSourceContext *c = ctx->priv;
+    char pix_fmt_str[128];
+    int n = 0;
+
+    if (!args ||
+        (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
+                    &c->time_base.num, &c->time_base.den,
+                    &c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
+        av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
+        return AVERROR(EINVAL);
+    }
+    if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
+        char *tail;
+        c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
+        if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
+            av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
+            return AVERROR(EINVAL);
+        }
+    }
+
+    if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*))))
+        return AVERROR(ENOMEM);
+
+    av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name);
+    return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    BufferSourceContext *s = ctx->priv;
+    while (av_fifo_size(s->fifo)) {
+        AVFilterBufferRef *buf;
+        av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
+        avfilter_unref_buffer(buf);
+    }
+    av_fifo_free(s->fifo);
+    s->fifo = NULL;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    BufferSourceContext *c = ctx->priv;
+    enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
+
+    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
+    return 0;
+}
+
+static int config_props(AVFilterLink *link)
+{
+    BufferSourceContext *c = link->src->priv;
+
+    link->w = c->w;
+    link->h = c->h;
+    link->sample_aspect_ratio = c->pixel_aspect;
+    link->time_base = c->time_base;
+
+    return 0;
+}
+
+static int request_frame(AVFilterLink *link)
+{
+    BufferSourceContext *c = link->src->priv;
+    AVFilterBufferRef *buf;
+
+    if (!av_fifo_size(c->fifo)) {
+        if (c->eof)
+            return AVERROR_EOF;
+        return AVERROR(EAGAIN);
+    }
+    av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
+
+    avfilter_start_frame(link, avfilter_ref_buffer(buf, ~0));
+    avfilter_draw_slice(link, 0, link->h, 1);
+    avfilter_end_frame(link);
+    avfilter_unref_buffer(buf);
+
+    return 0;
+}
+
+static int poll_frame(AVFilterLink *link)
+{
+    BufferSourceContext *c = link->src->priv;
+    int size = av_fifo_size(c->fifo);
+    if (!size && c->eof)
+        return AVERROR_EOF;
+    return size/sizeof(AVFilterBufferRef*);
+}
+
+AVFilter avfilter_vsrc_buffer = {
+    .name      = "buffer",
+    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
+    .priv_size = sizeof(BufferSourceContext),
+    .query_formats = query_formats,
+
+    .init      = init,
+    .uninit    = uninit,
+
+    .inputs    = (AVFilterPad[]) {{ .name = NULL }},
+    .outputs   = (AVFilterPad[]) {{ .name            = "default",
+                                    .type            = AVMEDIA_TYPE_VIDEO,
+                                    .request_frame   = request_frame,
+                                    .poll_frame      = poll_frame,
+                                    .config_props    = config_props, },
+                                  { .name = NULL}},
+};