[FFmpeg-cvslog] lavu: add a framework for handling hwaccel frames
Anton Khirnov
git at videolan.org
Wed Feb 17 17:13:34 CET 2016
ffmpeg | branch: master | Anton Khirnov <anton at khirnov.net> | Fri Nov 20 19:47:29 2015 +0100| [89923e418b494e337683442ab896d754bc07341a] | committer: Anton Khirnov
lavu: add a framework for handling hwaccel frames
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=89923e418b494e337683442ab896d754bc07341a
---
doc/APIchanges | 2 +
libavutil/Makefile | 2 +
libavutil/frame.c | 11 ++
libavutil/frame.h | 6 +
libavutil/hwcontext.c | 396 ++++++++++++++++++++++++++++++++++++++++
libavutil/hwcontext.h | 328 +++++++++++++++++++++++++++++++++
libavutil/hwcontext_internal.h | 89 +++++++++
7 files changed, 834 insertions(+)
diff --git a/doc/APIchanges b/doc/APIchanges
index 5bc5968..84d5e90 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,8 @@ API changes, most recent first:
2016-xx-xx - lavu 55.6.0
xxxxxxx buffer.h - Add av_buffer_pool_init2().
+ xxxxxxx hwcontext.h - Add a new installed header hwcontext.h with a new API
+ for handling hwaccel frames.
2016-xx-xx - xxxxxxx - lavf 57.3.0 - avformat.h
Add AVFormatContext.opaque, io_open and io_close, allowing custom IO
diff --git a/libavutil/Makefile b/libavutil/Makefile
index 17bd57e..2c0b7b5 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -23,6 +23,7 @@ HEADERS = adler32.h \
file.h \
frame.h \
hmac.h \
+ hwcontext.h \
imgutils.h \
intfloat.h \
intreadwrite.h \
@@ -78,6 +79,7 @@ OBJS = adler32.o \
float_dsp.o \
frame.o \
hmac.o \
+ hwcontext.o \
imgutils.o \
intmath.o \
lfg.o \
diff --git a/libavutil/frame.c b/libavutil/frame.c
index 15276fe..542215a 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -251,6 +251,14 @@ int av_frame_ref(AVFrame *dst, const AVFrame *src)
}
}
+ if (src->hw_frames_ctx) {
+ dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
+ if (!dst->hw_frames_ctx) {
+ 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);
@@ -303,6 +311,9 @@ void av_frame_unref(AVFrame *frame)
for (i = 0; i < frame->nb_extended_buf; i++)
av_buffer_unref(&frame->extended_buf[i]);
av_freep(&frame->extended_buf);
+
+ av_buffer_unref(&frame->hw_frames_ctx);
+
get_frame_defaults(frame);
}
diff --git a/libavutil/frame.h b/libavutil/frame.h
index c723cb0..5398b89 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -354,6 +354,12 @@ typedef struct AVFrame {
enum AVColorSpace colorspace;
enum AVChromaLocation chroma_location;
+
+ /**
+ * For hwaccel-format frames, this should be a reference to the
+ * AVHWFramesContext describing the frame.
+ */
+ AVBufferRef *hw_frames_ctx;
} AVFrame;
/**
diff --git a/libavutil/hwcontext.c b/libavutil/hwcontext.c
new file mode 100644
index 0000000..bec8f61
--- /dev/null
+++ b/libavutil/hwcontext.c
@@ -0,0 +1,396 @@
+/*
+ * 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 "config.h"
+
+#include "buffer.h"
+#include "common.h"
+#include "hwcontext.h"
+#include "hwcontext_internal.h"
+#include "imgutils.h"
+#include "log.h"
+#include "mem.h"
+#include "pixdesc.h"
+#include "pixfmt.h"
+
+static const HWContextType *hw_table[] = {
+ NULL,
+};
+
+static const AVClass hwdevice_ctx_class = {
+ .class_name = "AVHWDeviceContext",
+ .item_name = av_default_item_name,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+static void hwdevice_ctx_free(void *opaque, uint8_t *data)
+{
+ AVHWDeviceContext *ctx = (AVHWDeviceContext*)data;
+
+ /* uninit might still want access the hw context and the user
+ * free() callback might destroy it, so uninit has to be called first */
+ if (ctx->internal->hw_type->device_uninit)
+ ctx->internal->hw_type->device_uninit(ctx);
+
+ if (ctx->free)
+ ctx->free(ctx);
+
+ av_freep(&ctx->hwctx);
+ av_freep(&ctx->internal->priv);
+ av_freep(&ctx->internal);
+ av_freep(&ctx);
+}
+
+AVBufferRef *av_hwdevice_ctx_alloc(enum AVHWDeviceType type)
+{
+ AVHWDeviceContext *ctx;
+ AVBufferRef *buf;
+ const HWContextType *hw_type = NULL;
+ int i;
+
+ for (i = 0; hw_table[i]; i++) {
+ if (hw_table[i]->type == type) {
+ hw_type = hw_table[i];
+ break;
+ }
+ }
+ if (!hw_type)
+ return NULL;
+
+ ctx = av_mallocz(sizeof(*ctx));
+ if (!ctx)
+ return NULL;
+
+ ctx->internal = av_mallocz(sizeof(*ctx->internal));
+ if (!ctx->internal)
+ goto fail;
+
+ if (hw_type->device_priv_size) {
+ ctx->internal->priv = av_mallocz(hw_type->device_priv_size);
+ if (!ctx->internal->priv)
+ goto fail;
+ }
+
+ if (hw_type->device_hwctx_size) {
+ ctx->hwctx = av_mallocz(hw_type->device_hwctx_size);
+ if (!ctx->hwctx)
+ goto fail;
+ }
+
+ buf = av_buffer_create((uint8_t*)ctx, sizeof(*ctx),
+ hwdevice_ctx_free, NULL,
+ AV_BUFFER_FLAG_READONLY);
+ if (!buf)
+ goto fail;
+
+ ctx->type = type;
+ ctx->av_class = &hwdevice_ctx_class;
+
+ ctx->internal->hw_type = hw_type;
+
+ return buf;
+
+fail:
+ if (ctx->internal)
+ av_freep(&ctx->internal->priv);
+ av_freep(&ctx->internal);
+ av_freep(&ctx->hwctx);
+ av_freep(&ctx);
+ return NULL;
+}
+
+int av_hwdevice_ctx_init(AVBufferRef *ref)
+{
+ AVHWDeviceContext *ctx = (AVHWDeviceContext*)ref->data;
+ int ret;
+
+ if (ctx->internal->hw_type->device_init) {
+ ret = ctx->internal->hw_type->device_init(ctx);
+ if (ret < 0)
+ goto fail;
+ }
+
+ return 0;
+fail:
+ if (ctx->internal->hw_type->device_uninit)
+ ctx->internal->hw_type->device_uninit(ctx);
+ return ret;
+}
+
+static const AVClass hwframe_ctx_class = {
+ .class_name = "AVHWFramesContext",
+ .item_name = av_default_item_name,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+static void hwframe_ctx_free(void *opaque, uint8_t *data)
+{
+ AVHWFramesContext *ctx = (AVHWFramesContext*)data;
+
+ if (ctx->internal->pool_internal)
+ av_buffer_pool_uninit(&ctx->internal->pool_internal);
+
+ if (ctx->internal->hw_type->frames_uninit)
+ ctx->internal->hw_type->frames_uninit(ctx);
+
+ if (ctx->free)
+ ctx->free(ctx);
+
+ av_buffer_unref(&ctx->device_ref);
+
+ av_freep(&ctx->hwctx);
+ av_freep(&ctx->internal->priv);
+ av_freep(&ctx->internal);
+ av_freep(&ctx);
+}
+
+AVBufferRef *av_hwframe_ctx_alloc(AVBufferRef *device_ref_in)
+{
+ AVHWDeviceContext *device_ctx = (AVHWDeviceContext*)device_ref_in->data;
+ const HWContextType *hw_type = device_ctx->internal->hw_type;
+ AVHWFramesContext *ctx;
+ AVBufferRef *buf, *device_ref = NULL;;
+
+ ctx = av_mallocz(sizeof(*ctx));
+ if (!ctx)
+ return NULL;
+
+ ctx->internal = av_mallocz(sizeof(*ctx->internal));
+ if (!ctx->internal)
+ goto fail;
+
+ if (hw_type->frames_priv_size) {
+ ctx->internal->priv = av_mallocz(hw_type->frames_priv_size);
+ if (!ctx->internal->priv)
+ goto fail;
+ }
+
+ if (hw_type->frames_hwctx_size) {
+ ctx->hwctx = av_mallocz(hw_type->frames_hwctx_size);
+ if (!ctx->hwctx)
+ goto fail;
+ }
+
+ device_ref = av_buffer_ref(device_ref_in);
+ if (!device_ref)
+ goto fail;
+
+ buf = av_buffer_create((uint8_t*)ctx, sizeof(*ctx),
+ hwframe_ctx_free, NULL,
+ AV_BUFFER_FLAG_READONLY);
+ if (!buf)
+ goto fail;
+
+ ctx->av_class = &hwframe_ctx_class;
+ ctx->device_ref = device_ref;
+ ctx->device_ctx = device_ctx;
+ ctx->format = AV_PIX_FMT_NONE;
+
+ ctx->internal->hw_type = hw_type;
+
+ return buf;
+
+fail:
+ if (device_ref)
+ av_buffer_unref(&device_ref);
+ if (ctx->internal)
+ av_freep(&ctx->internal->priv);
+ av_freep(&ctx->internal);
+ av_freep(&ctx->hwctx);
+ av_freep(&ctx);
+ return NULL;
+}
+
+static int hwframe_pool_prealloc(AVBufferRef *ref)
+{
+ AVHWFramesContext *ctx = (AVHWFramesContext*)ref->data;
+ AVFrame **frames;
+ int i, ret = 0;
+
+ frames = av_mallocz_array(ctx->initial_pool_size, sizeof(*frames));
+ if (!frames)
+ return AVERROR(ENOMEM);
+
+ for (i = 0; i < ctx->initial_pool_size; i++) {
+ frames[i] = av_frame_alloc();
+ if (!frames[i])
+ goto fail;
+
+ ret = av_hwframe_get_buffer(ref, frames[i], 0);
+ if (ret < 0)
+ goto fail;
+ }
+
+fail:
+ for (i = 0; i < ctx->initial_pool_size; i++)
+ av_frame_free(&frames[i]);
+ av_freep(&frames);
+
+ return ret;
+}
+
+int av_hwframe_ctx_init(AVBufferRef *ref)
+{
+ AVHWFramesContext *ctx = (AVHWFramesContext*)ref->data;
+ const enum AVPixelFormat *pix_fmt;
+ int ret;
+
+ /* validate the pixel format */
+ for (pix_fmt = ctx->internal->hw_type->pix_fmts; *pix_fmt != AV_PIX_FMT_NONE; pix_fmt++) {
+ if (*pix_fmt == ctx->format)
+ break;
+ }
+ if (*pix_fmt == AV_PIX_FMT_NONE) {
+ av_log(ctx, AV_LOG_ERROR,
+ "The hardware pixel format '%s' is not supported by the device type '%s'\n",
+ av_get_pix_fmt_name(ctx->format), ctx->internal->hw_type->name);
+ return AVERROR(ENOSYS);
+ }
+
+ /* validate the dimensions */
+ ret = av_image_check_size(ctx->width, ctx->height, 0, ctx);
+ if (ret < 0)
+ return ret;
+
+ /* format-specific init */
+ if (ctx->internal->hw_type->frames_init) {
+ ret = ctx->internal->hw_type->frames_init(ctx);
+ if (ret < 0)
+ goto fail;
+ }
+
+ if (ctx->internal->pool_internal && !ctx->pool)
+ ctx->pool = ctx->internal->pool_internal;
+
+ /* preallocate the frames in the pool, if requested */
+ if (ctx->initial_pool_size > 0) {
+ ret = hwframe_pool_prealloc(ref);
+ if (ret < 0)
+ goto fail;
+ }
+
+ return 0;
+fail:
+ if (ctx->internal->hw_type->frames_uninit)
+ ctx->internal->hw_type->frames_uninit(ctx);
+ return ret;
+}
+
+int av_hwframe_transfer_get_formats(AVBufferRef *hwframe_ref,
+ enum AVHWFrameTransferDirection dir,
+ enum AVPixelFormat **formats, int flags)
+{
+ AVHWFramesContext *ctx = (AVHWFramesContext*)hwframe_ref->data;
+
+ if (!ctx->internal->hw_type->transfer_get_formats)
+ return AVERROR(ENOSYS);
+
+ return ctx->internal->hw_type->transfer_get_formats(ctx, dir, formats);
+}
+
+static int transfer_data_alloc(AVFrame *dst, const AVFrame *src, int flags)
+{
+ AVFrame *frame_tmp;
+ int ret = 0;
+
+ frame_tmp = av_frame_alloc();
+ if (!frame_tmp)
+ return AVERROR(ENOMEM);
+
+ /* if the format is set, use that
+ * otherwise pick the first supported one */
+ if (dst->format >= 0) {
+ frame_tmp->format = dst->format;
+ } else {
+ enum AVPixelFormat *formats;
+
+ ret = av_hwframe_transfer_get_formats(src->hw_frames_ctx,
+ AV_HWFRAME_TRANSFER_DIRECTION_FROM,
+ &formats, 0);
+ if (ret < 0)
+ goto fail;
+ frame_tmp->format = formats[0];
+ av_freep(&formats);
+ }
+ frame_tmp->width = src->width;
+ frame_tmp->height = src->height;
+
+ ret = av_frame_get_buffer(frame_tmp, 32);
+ if (ret < 0)
+ goto fail;
+
+ ret = av_hwframe_transfer_data(frame_tmp, src, flags);
+ if (ret < 0)
+ goto fail;
+
+ av_frame_move_ref(dst, frame_tmp);
+
+fail:
+ av_frame_free(&frame_tmp);
+ return ret;
+}
+
+int av_hwframe_transfer_data(AVFrame *dst, const AVFrame *src, int flags)
+{
+ AVHWFramesContext *ctx;
+ int ret;
+
+ if (!dst->buf[0])
+ return transfer_data_alloc(dst, src, flags);
+
+ if (src->hw_frames_ctx) {
+ ctx = (AVHWFramesContext*)src->hw_frames_ctx->data;
+
+ ret = ctx->internal->hw_type->transfer_data_from(ctx, dst, src);
+ if (ret < 0)
+ return ret;
+ } else if (dst->hw_frames_ctx) {
+ ctx = (AVHWFramesContext*)dst->hw_frames_ctx->data;
+
+ ret = ctx->internal->hw_type->transfer_data_to(ctx, dst, src);
+ if (ret < 0)
+ return ret;
+ } else
+ return AVERROR(ENOSYS);
+
+ return 0;
+}
+
+int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags)
+{
+ AVHWFramesContext *ctx = (AVHWFramesContext*)hwframe_ref->data;
+ int ret;
+
+ if (!ctx->internal->hw_type->frames_get_buffer)
+ return AVERROR(ENOSYS);
+
+ if (!ctx->pool)
+ return AVERROR(EINVAL);
+
+ frame->hw_frames_ctx = av_buffer_ref(hwframe_ref);
+ if (!frame->hw_frames_ctx)
+ return AVERROR(ENOMEM);
+
+ ret = ctx->internal->hw_type->frames_get_buffer(ctx, frame);
+ if (ret < 0) {
+ av_buffer_unref(&frame->hw_frames_ctx);
+ return ret;
+ }
+
+ return 0;
+}
diff --git a/libavutil/hwcontext.h b/libavutil/hwcontext.h
new file mode 100644
index 0000000..b30a20a
--- /dev/null
+++ b/libavutil/hwcontext.h
@@ -0,0 +1,328 @@
+/*
+ * 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 AVUTIL_HWCONTEXT_H
+#define AVUTIL_HWCONTEXT_H
+
+#include "buffer.h"
+#include "frame.h"
+#include "log.h"
+#include "pixfmt.h"
+
+enum AVHWDeviceType {
+ AV_HWDEVICE_TYPE_VDPAU,
+};
+
+typedef struct AVHWDeviceInternal AVHWDeviceInternal;
+
+/**
+ * This struct aggregates all the (hardware/vendor-specific) "high-level" state,
+ * i.e. state that is not tied to a concrete processing configuration.
+ * E.g., in an API that supports hardware-accelerated encoding and decoding,
+ * this struct will (if possible) wrap the state that is common to both encoding
+ * and decoding and from which specific instances of encoders or decoders can be
+ * derived.
+ *
+ * This struct is reference-counted with the AVBuffer mechanism. The
+ * av_hwdevice_ctx_alloc() constructor yields a reference, whose data field
+ * points to the actual AVHWDeviceContext. Further objects derived from
+ * AVHWDeviceContext (such as AVHWFramesContext, describing a frame pool with
+ * specific properties) will hold an internal reference to it. After all the
+ * references are released, the AVHWDeviceContext itself will be freed,
+ * optionally invoking a user-specified callback for uninitializing the hardware
+ * state.
+ */
+typedef struct AVHWDeviceContext {
+ /**
+ * A class for logging. Set by av_hwdevice_ctx_alloc().
+ */
+ const AVClass *av_class;
+
+ /**
+ * Private data used internally by libavutil. Must not be accessed in any
+ * way by the caller.
+ */
+ AVHWDeviceInternal *internal;
+
+ /**
+ * This field identifies the underlying API used for hardware access.
+ *
+ * This field is set when this struct is allocated and never changed
+ * afterwards.
+ */
+ enum AVHWDeviceType type;
+
+ /**
+ * The format-specific data, allocated and freed by libavutil along with
+ * this context.
+ *
+ * Should be cast by the user to the format-specific context defined in the
+ * corresponding header (hwcontext_*.h) and filled as described in the
+ * documentation before calling av_hwdevice_ctx_init().
+ *
+ * After calling av_hwdevice_ctx_init() this struct should not be modified
+ * by the caller.
+ */
+ void *hwctx;
+
+ /**
+ * This field may be set by the caller before calling av_hwdevice_ctx_init().
+ *
+ * If non-NULL, this callback will be called when the last reference to
+ * this context is unreferenced, immediately before it is freed.
+ *
+ * @note when other objects (e.g an AVHWFramesContext) are derived from this
+ * struct, this callback will be invoked after all such child objects
+ * are fully uninitialized and their respective destructors invoked.
+ */
+ void (*free)(struct AVHWDeviceContext *ctx);
+
+ /**
+ * Arbitrary user data, to be used e.g. by the free() callback.
+ */
+ void *user_opaque;
+} AVHWDeviceContext;
+
+typedef struct AVHWFramesInternal AVHWFramesInternal;
+
+/**
+ * This struct describes a set or pool of "hardware" frames (i.e. those with
+ * data not located in normal system memory). All the frames in the pool are
+ * assumed to be allocated in the same way and interchangeable.
+ *
+ * This struct is reference-counted with the AVBuffer mechanism and tied to a
+ * given AVHWDeviceContext instance. The av_hwframe_ctx_alloc() constructor
+ * yields a reference, whose data field points to the actual AVHWFramesContext
+ * struct.
+ */
+typedef struct AVHWFramesContext {
+ /**
+ * A class for logging.
+ */
+ const AVClass *av_class;
+
+ /**
+ * Private data used internally by libavutil. Must not be accessed in any
+ * way by the caller.
+ */
+ AVHWFramesInternal *internal;
+
+ /**
+ * A reference to the parent AVHWDeviceContext. This reference is owned and
+ * managed by the enclosing AVHWFramesContext, but the caller may derive
+ * additional references from it.
+ */
+ AVBufferRef *device_ref;
+
+ /**
+ * The parent AVHWDeviceContext. This is simply a pointer to
+ * device_ref->data provided for convenience.
+ *
+ * Set by libavutil in av_hwframe_ctx_init().
+ */
+ AVHWDeviceContext *device_ctx;
+
+ /**
+ * The format-specific data, allocated and freed automatically along with
+ * this context.
+ *
+ * Should be cast by the user to the format-specific context defined in the
+ * corresponding header (hwframe_*.h) and filled as described in the
+ * documentation before calling av_hwframe_ctx_init().
+ *
+ * After any frames using this context are created, the contents of this
+ * struct should not be modified by the caller.
+ */
+ void *hwctx;
+
+ /**
+ * This field may be set by the caller before calling av_hwframe_ctx_init().
+ *
+ * If non-NULL, this callback will be called when the last reference to
+ * this context is unreferenced, immediately before it is freed.
+ */
+ void (*free)(struct AVHWFramesContext *ctx);
+
+ /**
+ * Arbitrary user data, to be used e.g. by the free() callback.
+ */
+ void *user_opaque;
+
+ /**
+ * A pool from which the frames are allocated by av_hwframe_get_buffer().
+ * This field may be set by the caller before calling av_hwframe_ctx_init().
+ * The buffers returned by calling av_buffer_pool_get() on this pool must
+ * have the properties described in the documentation in the correponding hw
+ * type's header (hwcontext_*.h). The pool will be freed strictly before
+ * this struct's free() callback is invoked.
+ *
+ * This field may be NULL, then libavutil will attempt to allocate a pool
+ * internally. Note that certain device types enforce pools allocated at
+ * fixed size (frame count), which cannot be extended dynamically. In such a
+ * case, initial_pool_size must be set appropriately.
+ */
+ AVBufferPool *pool;
+
+ /**
+ * Initial size of the frame pool. If a device type does not support
+ * dynamically resizing the pool, then this is also the maximum pool size.
+ *
+ * May be set by the caller before calling av_hwframe_ctx_init(). Must be
+ * set if pool is NULL and the device type does not support dynamic pools.
+ */
+ int initial_pool_size;
+
+ /**
+ * The pixel format identifying the underlying HW surface type.
+ *
+ * Must be a hwaccel format, i.e. the corresponding descriptor must have the
+ * AV_PIX_FMT_FLAG_HWACCEL flag set.
+ *
+ * Must be set by the user before calling av_hwframe_ctx_init().
+ */
+ enum AVPixelFormat format;
+
+ /**
+ * The pixel format identifying the actual data layout of the hardware
+ * frames.
+ *
+ * Must be set by the caller before calling av_hwframe_ctx_init().
+ *
+ * @note when the underlying API does not provide the exact data layout, but
+ * only the colorspace/bit depth, this field should be set to the fully
+ * planar version of that format (e.g. for 8-bit 420 YUV it should be
+ * AV_PIX_FMT_YUV420P, not AV_PIX_FMT_NV12 or anything else).
+ */
+ enum AVPixelFormat sw_format;
+
+ /**
+ * The allocated dimensions of the frames in this pool.
+ *
+ * Must be set by the user before calling av_hwframe_ctx_init().
+ */
+ int width, height;
+} AVHWFramesContext;
+
+/**
+ * Allocate an AVHWDeviceContext for a given pixel format.
+ *
+ * @param format a hwaccel pixel format (AV_PIX_FMT_FLAG_HWACCEL must be set
+ * on the corresponding format descriptor)
+ * @return a reference to the newly created AVHWDeviceContext on success or NULL
+ * on failure.
+ */
+AVBufferRef *av_hwdevice_ctx_alloc(enum AVHWDeviceType type);
+
+/**
+ * Finalize the device context before use. This function must be called after
+ * the context is filled with all the required information and before it is
+ * used in any way.
+ *
+ * @param ref a reference to the AVHWDeviceContext
+ * @return 0 on success, a negative AVERROR code on failure
+ */
+int av_hwdevice_ctx_init(AVBufferRef *ref);
+
+/**
+ * Allocate an AVHWFramesContext tied to a given device context.
+ *
+ * @param device_ctx a reference to a AVHWDeviceContext. This function will make
+ * a new reference for internal use, the one passed to the
+ * function remains owned by the caller.
+ * @return a reference to the newly created AVHWFramesContext on success or NULL
+ * on failure.
+ */
+AVBufferRef *av_hwframe_ctx_alloc(AVBufferRef *device_ctx);
+
+/**
+ * Finalize the context before use. This function must be called after the
+ * context is filled with all the required information and before it is attached
+ * to any frames.
+ *
+ * @param ref a reference to the AVHWFramesContext
+ * @return 0 on success, a negative AVERROR code on failure
+ */
+int av_hwframe_ctx_init(AVBufferRef *ref);
+
+/**
+ * Allocate a new frame attached to the given AVHWFramesContext.
+ *
+ * @param hwframe_ctx a reference to an AVHWFramesContext
+ * @param frame an empty (freshly allocated or unreffed) frame to be filled with
+ * newly allocated buffers.
+ * @param flags currently unused, should be set to zero
+ * @return 0 on success, a negative AVERROR code on failure
+ */
+int av_hwframe_get_buffer(AVBufferRef *hwframe_ctx, AVFrame *frame, int flags);
+
+/**
+ * Copy data to or from a hw surface. At least one of dst/src must have an
+ * AVHWFramesContext attached.
+ *
+ * If src has an AVHWFramesContext attached, then the format of dst (if set)
+ * must use one of the formats returned by av_hwframe_transfer_get_formats(src,
+ * AV_HWFRAME_TRANSFER_DIRECTION_FROM).
+ * If dst has an AVHWFramesContext attached, then the format of src must use one
+ * of the formats returned by av_hwframe_transfer_get_formats(dst,
+ * AV_HWFRAME_TRANSFER_DIRECTION_TO)
+ *
+ * dst may be "clean" (i.e. with data/buf pointers unset), in which case the
+ * data buffers will be allocated by this function using av_frame_get_buffer().
+ * If dst->format is set, then this format will be used, otherwise (when
+ * dst->format is AV_PIX_FMT_NONE) the first acceptable format will be chosen.
+ *
+ * @param dst the destination frame. dst is not touched on failure.
+ * @param src the source frame.
+ * @param flags currently unused, should be set to zero
+ * @return 0 on success, a negative AVERROR error code on failure.
+ */
+int av_hwframe_transfer_data(AVFrame *dst, const AVFrame *src, int flags);
+
+enum AVHWFrameTransferDirection {
+ /**
+ * Transfer the data from the queried hw frame.
+ */
+ AV_HWFRAME_TRANSFER_DIRECTION_FROM,
+
+ /**
+ * Transfer the data to the queried hw frame.
+ */
+ AV_HWFRAME_TRANSFER_DIRECTION_TO,
+};
+
+/**
+ * Get a list of possible source or target formats usable in
+ * av_hwframe_transfer_data().
+ *
+ * @param hwframe_ctx the frame context to obtain the information for
+ * @param dir the direction of the transfer
+ * @param formats the pointer to the output format list will be written here.
+ * The list is terminated with AV_PIX_FMT_NONE and must be freed
+ * by the caller when no longer needed using av_free().
+ * If this function returns successfully, the format list will
+ * have at least one item (not counting the terminator).
+ * On failure, the contents of this pointer are unspecified.
+ * @param flags currently unused, should be set to zero
+ * @return 0 on success, a negative AVERROR code on failure.
+ */
+int av_hwframe_transfer_get_formats(AVBufferRef *hwframe_ctx,
+ enum AVHWFrameTransferDirection dir,
+ enum AVPixelFormat **formats, int flags);
+
+
+#endif /* AVUTIL_HWCONTEXT_H */
diff --git a/libavutil/hwcontext_internal.h b/libavutil/hwcontext_internal.h
new file mode 100644
index 0000000..acc775c
--- /dev/null
+++ b/libavutil/hwcontext_internal.h
@@ -0,0 +1,89 @@
+/*
+ * 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 AVUTIL_HWCONTEXT_INTERNAL_H
+#define AVUTIL_HWCONTEXT_INTERNAL_H
+
+#include <stddef.h>
+
+#include "buffer.h"
+#include "hwcontext.h"
+#include "frame.h"
+#include "pixfmt.h"
+
+typedef struct HWContextType {
+ enum AVHWDeviceType type;
+ const char *name;
+
+ /**
+ * An array of pixel formats supported by the AVHWFramesContext instances
+ * Terminated by AV_PIX_FMT_NONE.
+ */
+ const enum AVPixelFormat *pix_fmts;
+
+ /**
+ * size of the public hardware-specific context,
+ * i.e. AVHWDeviceContext.hwctx
+ */
+ size_t device_hwctx_size;
+ /**
+ * size of the private data, i.e.
+ * AVHWDeviceInternal.priv
+ */
+ size_t device_priv_size;
+
+ /**
+ * size of the public frame pool hardware-specific context,
+ * i.e. AVHWFramesContext.hwctx
+ */
+ size_t frames_hwctx_size;
+ /**
+ * size of the private data, i.e.
+ * AVHWFramesInternal.priv
+ */
+ size_t frames_priv_size;
+
+ int (*device_init)(AVHWDeviceContext *ctx);
+ void (*device_uninit)(AVHWDeviceContext *ctx);
+
+ int (*frames_init)(AVHWFramesContext *ctx);
+ void (*frames_uninit)(AVHWFramesContext *ctx);
+
+ int (*frames_get_buffer)(AVHWFramesContext *ctx, AVFrame *frame);
+ int (*transfer_get_formats)(AVHWFramesContext *ctx,
+ enum AVHWFrameTransferDirection dir,
+ enum AVPixelFormat **formats);
+ int (*transfer_data_to)(AVHWFramesContext *ctx, AVFrame *dst,
+ const AVFrame *src);
+ int (*transfer_data_from)(AVHWFramesContext *ctx, AVFrame *dst,
+ const AVFrame *src);
+} HWContextType;
+
+struct AVHWDeviceInternal {
+ const HWContextType *hw_type;
+ void *priv;
+};
+
+struct AVHWFramesInternal {
+ const HWContextType *hw_type;
+ void *priv;
+
+ AVBufferPool *pool_internal;
+};
+
+#endif /* AVUTIL_HWCONTEXT_INTERNAL_H */
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