Move AVFrame from lavc to lavu.

Add AVBuffer-based reference counting API to it.

1 files changed, 401 insertions, 0 deletions

diff --git a/libavutil/frame.c b/libavutil/frame.c
new file mode 100644
index 0000000000..e84052eda0
--- /dev/null
+++ b/libavutil/frame.c
@@ -0,0 +1,401 @@
+/*
+ *
+ * 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 "audioconvert.h"
+#include "buffer.h"
+#include "common.h"
+#include "frame.h"
+#include "imgutils.h"
+#include "mem.h"
+#include "samplefmt.h"
+
+static void get_frame_defaults(AVFrame *frame)
+{
+    if (frame->extended_data != frame->data)
+        av_freep(&frame->extended_data);
+
+    memset(frame, 0, sizeof(*frame));
+
+    frame->pts                 = AV_NOPTS_VALUE;
+    frame->key_frame           = 1;
+    frame->sample_aspect_ratio = (AVRational){ 0, 1 };
+    frame->format              = -1; /* unknown */
+    frame->extended_data       = frame->data;
+}
+
+AVFrame *av_frame_alloc(void)
+{
+    AVFrame *frame = av_mallocz(sizeof(*frame));
+
+    if (!frame)
+        return NULL;
+
+    get_frame_defaults(frame);
+
+    return frame;
+}
+
+void av_frame_free(AVFrame **frame)
+{
+    if (!frame || !*frame)
+        return;
+
+    av_frame_unref(*frame);
+    av_freep(frame);
+}
+
+static int get_video_buffer(AVFrame *frame, int align)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
+    int ret, i;
+
+    if (!desc)
+        return AVERROR(EINVAL);
+
+    if ((ret = av_image_check_size(frame->width, frame->height, 0, NULL)) < 0)
+        return ret;
+
+    if (!frame->linesize[0]) {
+        ret = av_image_fill_linesizes(frame->linesize, frame->format,
+                                      frame->width);
+        if (ret < 0)
+            return ret;
+
+        for (i = 0; i < 4 && frame->linesize[i]; i++)
+            frame->linesize[i] = FFALIGN(frame->linesize[i], align);
+    }
+
+    for (i = 0; i < 4 && frame->linesize[i]; i++) {
+        int h = frame->height;
+        if (i == 1 || i == 2)
+            h = -((-h) >> desc->log2_chroma_h);
+
+        frame->buf[i] = av_buffer_alloc(frame->linesize[i] * h);
+        if (!frame->buf[i])
+            goto fail;
+
+        frame->data[i] = frame->buf[i]->data;
+    }
+    if (desc->flags & PIX_FMT_PAL || desc->flags & PIX_FMT_PSEUDOPAL) {
+        av_buffer_unref(&frame->buf[1]);
+        frame->buf[1] = av_buffer_alloc(1024);
+        if (!frame->buf[1])
+            goto fail;
+        frame->data[1] = frame->buf[1]->data;
+    }
+
+    frame->extended_data = frame->data;
+
+    return 0;
+fail:
+    av_frame_unref(frame);
+    return AVERROR(ENOMEM);
+}
+
+static int get_audio_buffer(AVFrame *frame, int align)
+{
+    int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
+    int planar   = av_sample_fmt_is_planar(frame->format);
+    int planes   = planar ? channels : 1;
+    int ret, i;
+
+    if (!frame->linesize[0]) {
+        ret = av_samples_get_buffer_size(&frame->linesize[0], channels,
+                                         frame->nb_samples, frame->format,
+                                         align);
+        if (ret < 0)
+            return ret;
+    }
+
+    if (planes > AV_NUM_DATA_POINTERS) {
+        frame->extended_data = av_mallocz(planes *
+                                          sizeof(*frame->extended_data));
+        frame->extended_buf  = av_mallocz((planes - AV_NUM_DATA_POINTERS) *
+                                          sizeof(*frame->extended_buf));
+        if (!frame->extended_data || !frame->extended_buf) {
+            av_freep(&frame->extended_data);
+            av_freep(&frame->extended_buf);
+            return AVERROR(ENOMEM);
+        }
+        frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
+    } else
+        frame->extended_data = frame->data;
+
+    for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
+        frame->buf[i] = av_buffer_alloc(frame->linesize[0]);
+        if (!frame->buf[i]) {
+            av_frame_unref(frame);
+            return AVERROR(ENOMEM);
+        }
+        frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
+    }
+    for (i = 0; i < planes - AV_NUM_DATA_POINTERS; i++) {
+        frame->extended_buf[i] = av_buffer_alloc(frame->linesize[0]);
+        if (!frame->extended_buf[i]) {
+            av_frame_unref(frame);
+            return AVERROR(ENOMEM);
+        }
+        frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
+    }
+    return 0;
+
+}
+
+int av_frame_get_buffer(AVFrame *frame, int align)
+{
+    if (frame->format < 0)
+        return AVERROR(EINVAL);
+
+    if (frame->width > 0 && frame->height > 0)
+        return get_video_buffer(frame, align);
+    else if (frame->nb_samples > 0 && frame->channel_layout)
+        return get_audio_buffer(frame, align);
+
+    return AVERROR(EINVAL);
+}
+
+int av_frame_ref(AVFrame *dst, AVFrame *src)
+{
+    int i, ret = 0;
+
+    dst->format         = src->format;
+    dst->width          = src->width;
+    dst->height         = src->height;
+    dst->channel_layout = src->channel_layout;
+    dst->nb_samples     = src->nb_samples;
+
+    ret = av_frame_copy_props(dst, src);
+    if (ret < 0)
+        return ret;
+
+    /* duplicate the frame data if it's not refcounted */
+    if (!src->buf[0]) {
+        ret = av_frame_get_buffer(dst, 32);
+        if (ret < 0)
+            return ret;
+
+        if (src->nb_samples) {
+            int ch = av_get_channel_layout_nb_channels(src->channel_layout);
+            av_samples_copy(dst->extended_data, src->extended_data, 0, 0,
+                            dst->nb_samples, ch, dst->format);
+        } else {
+            av_image_copy(dst->data, dst->linesize, src->data, src->linesize,
+                          dst->format, dst->width, dst->height);
+        }
+        return 0;
+    }
+
+    /* ref the buffers */
+    for (i = 0; i < FF_ARRAY_ELEMS(src->buf) && src->buf[i]; i++) {
+        dst->buf[i] = av_buffer_ref(src->buf[i]);
+        if (!dst->buf[i]) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+    }
+
+    if (src->extended_buf) {
+        dst->extended_buf = av_mallocz(sizeof(*dst->extended_buf) *
+                                       src->nb_extended_buf);
+        if (!dst->extended_buf) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        dst->nb_extended_buf = src->nb_extended_buf;
+
+        for (i = 0; i < src->nb_extended_buf; i++) {
+            dst->extended_buf[i] = av_buffer_ref(src->extended_buf[i]);
+            if (!dst->extended_buf[i]) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
+        }
+    }
+
+    /* duplicate extended data */
+    if (src->extended_data != src->data) {
+        int ch = av_get_channel_layout_nb_channels(src->channel_layout);
+
+        if (!ch) {
+            ret = AVERROR(EINVAL);
+            goto fail;
+        }
+
+        dst->extended_data = av_malloc(sizeof(*dst->extended_data) * ch);
+        if (!dst->extended_data) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        memcpy(dst->extended_data, src->extended_data, sizeof(*src->extended_data) * ch);
+    } else
+        dst->extended_data = dst->data;
+
+    memcpy(dst->data,     src->data,     sizeof(src->data));
+    memcpy(dst->linesize, src->linesize, sizeof(src->linesize));
+
+    return 0;
+
+fail:
+    av_frame_unref(dst);
+    return ret;
+}
+
+AVFrame *av_frame_clone(AVFrame *src)
+{
+    AVFrame *ret = av_frame_alloc();
+
+    if (!ret)
+        return NULL;
+
+    if (av_frame_ref(ret, src) < 0)
+        av_frame_free(&ret);
+
+    return ret;
+}
+
+void av_frame_unref(AVFrame *frame)
+{
+    int i;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
+        av_buffer_unref(&frame->buf[i]);
+    for (i = 0; i < frame->nb_extended_buf; i++)
+        av_buffer_unref(&frame->extended_buf[i]);
+    av_freep(&frame->extended_buf);
+    get_frame_defaults(frame);
+}
+
+void av_frame_move_ref(AVFrame *dst, AVFrame *src)
+{
+    *dst = *src;
+    if (src->extended_data == src->data)
+        dst->extended_data = dst->data;
+    memset(src, 0, sizeof(*src));
+    get_frame_defaults(src);
+}
+
+int av_frame_is_writable(AVFrame *frame)
+{
+    int i, ret = 1;
+
+    /* assume non-refcounted frames are not writable */
+    if (!frame->buf[0])
+        return 0;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++)
+        ret &= !!av_buffer_is_writable(frame->buf[i]);
+    for (i = 0; i < frame->nb_extended_buf; i++)
+        ret &= !!av_buffer_is_writable(frame->extended_buf[i]);
+
+    return ret;
+}
+
+int av_frame_make_writable(AVFrame *frame)
+{
+    AVFrame tmp;
+    int ret;
+
+    if (!frame->buf[0])
+        return AVERROR(EINVAL);
+
+    if (av_frame_is_writable(frame))
+        return 0;
+
+    memset(&tmp, 0, sizeof(tmp));
+    tmp.format         = frame->format;
+    tmp.width          = frame->width;
+    tmp.height         = frame->height;
+    tmp.channel_layout = frame->channel_layout;
+    tmp.nb_samples     = frame->nb_samples;
+    ret = av_frame_get_buffer(&tmp, 32);
+    if (ret < 0)
+        return ret;
+
+    if (tmp.nb_samples) {
+        int ch = av_get_channel_layout_nb_channels(tmp.channel_layout);
+        av_samples_copy(tmp.extended_data, frame->extended_data, 0, 0,
+                        frame->nb_samples, ch, frame->format);
+    } else {
+        av_image_copy(tmp.data, tmp.linesize, frame->data, frame->linesize,
+                      frame->format, frame->width, frame->height);
+    }
+
+    ret = av_frame_copy_props(&tmp, frame);
+    if (ret < 0) {
+        av_frame_unref(&tmp);
+        return ret;
+    }
+
+    av_frame_unref(frame);
+
+    *frame = tmp;
+    if (tmp.data == tmp.extended_data)
+        frame->extended_data = frame->data;
+
+    return 0;
+}
+
+int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
+{
+    dst->key_frame           = src->key_frame;
+    dst->pict_type           = src->pict_type;
+    dst->sample_aspect_ratio = src->sample_aspect_ratio;
+    dst->pts                 = src->pts;
+    dst->interlaced_frame    = src->interlaced_frame;
+    dst->top_field_first     = src->top_field_first;
+    dst->sample_rate         = src->sample_rate;
+    dst->opaque              = src->opaque;
+    dst->pkt_pts             = src->pkt_pts;
+    dst->pkt_dts             = src->pkt_dts;
+    dst->quality             = src->quality;
+    dst->coded_picture_number = src->coded_picture_number;
+    dst->display_picture_number = src->display_picture_number;
+
+    return 0;
+}
+
+AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane)
+{
+    uint8_t *data;
+    int planes, i;
+
+    if (frame->nb_samples) {
+        int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
+        if (!channels)
+            return NULL;
+        planes = av_sample_fmt_is_planar(frame->format) ? channels : 1;
+    } else
+        planes = 4;
+
+    if (plane < 0 || plane >= planes || !frame->extended_data[plane])
+        return NULL;
+    data = frame->extended_data[plane];
+
+    for (i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++) {
+        AVBufferRef *buf = frame->buf[i];
+        if (data >= buf->data && data < buf->data + buf->size)
+            return buf;
+    }
+    for (i = 0; i < frame->nb_extended_buf; i++) {
+        AVBufferRef *buf = frame->extended_buf[i];
+        if (data >= buf->data && data < buf->data + buf->size)
+            return buf;
+    }
+    return NULL;
+}