1 files changed, 304 insertions, 0 deletions

diff --git a/media/ffvpx/libavcodec/get_buffer.c b/media/ffvpx/libavcodec/get_buffer.c
new file mode 100644
index 0000000000..a04fd878de
--- /dev/null
+++ b/media/ffvpx/libavcodec/get_buffer.c
@@ -0,0 +1,304 @@
+/*
+ * The default get_buffer2() implementation
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#include "libavutil/avassert.h"
+#include "libavutil/avutil.h"
+#include "libavutil/buffer.h"
+#include "libavutil/frame.h"
+#include "libavutil/hwcontext.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/mem.h"
+#include "libavutil/samplefmt.h"
+#include "libavutil/version.h"
+
+#include "avcodec.h"
+#include "internal.h"
+
+typedef struct FramePool {
+    /**
+     * Pools for each data plane. For audio all the planes have the same size,
+     * so only pools[0] is used.
+     */
+    AVBufferPool *pools[4];
+
+    /*
+     * Pool parameters
+     */
+    int format;
+    int width, height;
+    int stride_align[AV_NUM_DATA_POINTERS];
+    int linesize[4];
+    int planes;
+    int channels;
+    int samples;
+} FramePool;
+
+static void frame_pool_free(void *opaque, uint8_t *data)
+{
+    FramePool *pool = (FramePool*)data;
+    int i;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(pool->pools); i++)
+        av_buffer_pool_uninit(&pool->pools[i]);
+
+    av_freep(&data);
+}
+
+static AVBufferRef *frame_pool_alloc(void)
+{
+    FramePool *pool = av_mallocz(sizeof(*pool));
+    AVBufferRef *buf;
+
+    if (!pool)
+        return NULL;
+
+    buf = av_buffer_create((uint8_t*)pool, sizeof(*pool),
+                           frame_pool_free, NULL, 0);
+    if (!buf) {
+        av_freep(&pool);
+        return NULL;
+    }
+
+    return buf;
+}
+
+static int update_frame_pool(AVCodecContext *avctx, AVFrame *frame)
+{
+    FramePool *pool = avctx->internal->pool ?
+                      (FramePool*)avctx->internal->pool->data : NULL;
+    AVBufferRef *pool_buf;
+    int i, ret, ch, planes;
+
+    if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
+        int planar = av_sample_fmt_is_planar(frame->format);
+        ch     = frame->ch_layout.nb_channels;
+#if FF_API_OLD_CHANNEL_LAYOUT
+FF_DISABLE_DEPRECATION_WARNINGS
+        if (!ch)
+            ch = frame->channels;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+        planes = planar ? ch : 1;
+    }
+
+    if (pool && pool->format == frame->format) {
+        if (avctx->codec_type == AVMEDIA_TYPE_VIDEO &&
+            pool->width == frame->width && pool->height == frame->height)
+            return 0;
+        if (avctx->codec_type == AVMEDIA_TYPE_AUDIO && pool->planes == planes &&
+            pool->channels == ch && frame->nb_samples == pool->samples)
+            return 0;
+    }
+
+    pool_buf = frame_pool_alloc();
+    if (!pool_buf)
+        return AVERROR(ENOMEM);
+    pool = (FramePool*)pool_buf->data;
+
+    switch (avctx->codec_type) {
+    case AVMEDIA_TYPE_VIDEO: {
+        int linesize[4];
+        int w = frame->width;
+        int h = frame->height;
+        int unaligned;
+        ptrdiff_t linesize1[4];
+        size_t size[4];
+
+        avcodec_align_dimensions2(avctx, &w, &h, pool->stride_align);
+
+        do {
+            // NOTE: do not align linesizes individually, this breaks e.g. assumptions
+            // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
+            ret = av_image_fill_linesizes(linesize, avctx->pix_fmt, w);
+            if (ret < 0)
+                goto fail;
+            // increase alignment of w for next try (rhs gives the lowest bit set in w)
+            w += w & ~(w - 1);
+
+            unaligned = 0;
+            for (i = 0; i < 4; i++)
+                unaligned |= linesize[i] % pool->stride_align[i];
+        } while (unaligned);
+
+        for (i = 0; i < 4; i++)
+            linesize1[i] = linesize[i];
+        ret = av_image_fill_plane_sizes(size, avctx->pix_fmt, h, linesize1);
+        if (ret < 0)
+            goto fail;
+
+        for (i = 0; i < 4; i++) {
+            pool->linesize[i] = linesize[i];
+            if (size[i]) {
+                if (size[i] > INT_MAX - (16 + STRIDE_ALIGN - 1)) {
+                    ret = AVERROR(EINVAL);
+                    goto fail;
+                }
+                pool->pools[i] = av_buffer_pool_init(size[i] + 16 + STRIDE_ALIGN - 1,
+                                                     CONFIG_MEMORY_POISONING ?
+                                                        NULL :
+                                                        av_buffer_allocz);
+                if (!pool->pools[i]) {
+                    ret = AVERROR(ENOMEM);
+                    goto fail;
+                }
+            }
+        }
+        pool->format = frame->format;
+        pool->width  = frame->width;
+        pool->height = frame->height;
+
+        break;
+        }
+    case AVMEDIA_TYPE_AUDIO: {
+        ret = av_samples_get_buffer_size(&pool->linesize[0], ch,
+                                         frame->nb_samples, frame->format, 0);
+        if (ret < 0)
+            goto fail;
+
+        pool->pools[0] = av_buffer_pool_init(pool->linesize[0], NULL);
+        if (!pool->pools[0]) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        pool->format     = frame->format;
+        pool->planes     = planes;
+        pool->channels   = ch;
+        pool->samples = frame->nb_samples;
+        break;
+        }
+    default: av_assert0(0);
+    }
+
+    av_buffer_unref(&avctx->internal->pool);
+    avctx->internal->pool = pool_buf;
+
+    return 0;
+fail:
+    av_buffer_unref(&pool_buf);
+    return ret;
+}
+
+static int audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
+{
+    FramePool *pool = (FramePool*)avctx->internal->pool->data;
+    int planes = pool->planes;
+    int i;
+
+    frame->linesize[0] = pool->linesize[0];
+
+    if (planes > AV_NUM_DATA_POINTERS) {
+        frame->extended_data = av_calloc(planes, sizeof(*frame->extended_data));
+        frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
+        frame->extended_buf  = av_calloc(frame->nb_extended_buf,
+                                          sizeof(*frame->extended_buf));
+        if (!frame->extended_data || !frame->extended_buf) {
+            av_freep(&frame->extended_data);
+            av_freep(&frame->extended_buf);
+            return AVERROR(ENOMEM);
+        }
+    } else {
+        frame->extended_data = frame->data;
+        av_assert0(frame->nb_extended_buf == 0);
+    }
+
+    for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
+        frame->buf[i] = av_buffer_pool_get(pool->pools[0]);
+        if (!frame->buf[i])
+            goto fail;
+        frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
+    }
+    for (i = 0; i < frame->nb_extended_buf; i++) {
+        frame->extended_buf[i] = av_buffer_pool_get(pool->pools[0]);
+        if (!frame->extended_buf[i])
+            goto fail;
+        frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
+    }
+
+    if (avctx->debug & FF_DEBUG_BUFFERS)
+        av_log(avctx, AV_LOG_DEBUG, "default_get_buffer called on frame %p", frame);
+
+    return 0;
+fail:
+    av_frame_unref(frame);
+    return AVERROR(ENOMEM);
+}
+
+static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
+{
+    FramePool *pool = (FramePool*)s->internal->pool->data;
+    int i;
+
+    if (pic->data[0] || pic->data[1] || pic->data[2] || pic->data[3]) {
+        av_log(s, AV_LOG_ERROR, "pic->data[*]!=NULL in avcodec_default_get_buffer\n");
+        return -1;
+    }
+
+    memset(pic->data, 0, sizeof(pic->data));
+    pic->extended_data = pic->data;
+
+    for (i = 0; i < 4 && pool->pools[i]; i++) {
+        pic->linesize[i] = pool->linesize[i];
+
+        pic->buf[i] = av_buffer_pool_get(pool->pools[i]);
+        if (!pic->buf[i])
+            goto fail;
+
+        pic->data[i] = pic->buf[i]->data;
+    }
+    for (; i < AV_NUM_DATA_POINTERS; i++) {
+        pic->data[i] = NULL;
+        pic->linesize[i] = 0;
+    }
+
+    if (s->debug & FF_DEBUG_BUFFERS)
+        av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p\n", pic);
+
+    return 0;
+fail:
+    av_frame_unref(pic);
+    return AVERROR(ENOMEM);
+}
+
+int avcodec_default_get_buffer2(AVCodecContext *avctx, AVFrame *frame, int flags)
+{
+    int ret;
+
+    if (avctx->hw_frames_ctx) {
+        ret = av_hwframe_get_buffer(avctx->hw_frames_ctx, frame, 0);
+        frame->width  = avctx->coded_width;
+        frame->height = avctx->coded_height;
+        return ret;
+    }
+
+    if ((ret = update_frame_pool(avctx, frame)) < 0)
+        return ret;
+
+    switch (avctx->codec_type) {
+    case AVMEDIA_TYPE_VIDEO:
+        return video_get_buffer(avctx, frame);
+    case AVMEDIA_TYPE_AUDIO:
+        return audio_get_buffer(avctx, frame);
+    default:
+        return -1;
+    }
+}