@@ -15,6 +15,9 @@ libavutil:     2017-10-21

 API changes, most recent first:

+2017-xx-xx - xxxxxxx - lavc 58.3.100 - avcodec.h

+  Add avcodec_get_hw_frames_parameters().

+

 -------- 8< --------- FFmpeg 3.4 was cut here -------- 8< ---------

 2017-09-28 - b6cf66ae1c - lavc 57.106.104 - avcodec.h

@@ -3534,6 +3534,16 @@ typedef struct AVHWAccel {

     int caps_internal;

     /**

+     * Fill the given hw_frames context with current codec parameters. Called

+     * from get_format. Refer to avcodec_get_hw_frames_parameters() for

+     * details.

+     *

+     * This CAN be called before AVHWAccel.init is called, and you must assume

+     * that avctx->hwaccel_priv_data is invalid.

+     */

+    int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);

+

+    /**

      * Some hwaccels are ambiguous if only the id and pix_fmt fields are used.

      * If non-NULL, the associated AVCodec must have

      * FF_CODEC_CAP_HWACCEL_REQUIRE_CLASS set.

@@ -4674,6 +4684,109 @@ int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);

  */

 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);

+/**

+ * Create and return a AVHWFramesContext with values adequate for hardware

+ * decoding. This is meant to get called from the get_format callback, and is

+ * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.

+ * This API is for decoding with certain hardware acceleration modes/APIs only.

+ *

+ * The returned AVHWFramesContext is not initialized. The caller must do this

+ * with av_hwframe_ctx_init().

+ *

+ * Calling this function is not a requirement, but makes it simpler to avoid

+ * codec or hardware API specific details when manually allocating frames.

+ *

+ * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,

+ * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes

+ * it unnecessary to call this function or having to care about

+ * AVHWFramesContext initialization at all.

+ *

+ * There are a number of requirements for calling this function:

+ *

+ * - It must be called from get_format with the same avctx parameter that was

+ *   passed to get_format. Calling it outside of get_format is not allowed, and

+ *   can trigger undefined behavior.

+ * - The function is not always supported (see description of return values).

+ *   Even if this function returns successfully, hwaccel initialization could

+ *   fail later. (The degree to which implementations check whether the stream

+ *   is actually supported varies. Some do this check only after the user's

+ *   get_format callback returns.)

+ * - The hw_pix_fmt must be one of the choices suggested by get_format. If the

+ *   user decides to use a AVHWFramesContext prepared with this API function,

+ *   the user must return the same hw_pix_fmt from get_format.

+ * - The device_ref passed to this function must support the given hw_pix_fmt.

+ * - After calling this API function, it is the user's responsibility to

+ *   initialize the AVHWFramesContext (returned by the out_frames_ref parameter),

+ *   and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done

+ *   before returning from get_format (this is implied by the normal

+ *   AVCodecContext.hw_frames_ctx API rules).

+ * - The AVHWFramesContext parameters may change every time time get_format is

+ *   called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So

+ *   you are inherently required to go through this process again on every

+ *   get_format call.

+ * - It is perfectly possible to call this function without actually using

+ *   the resulting AVHWFramesContext. One use-case might be trying to reuse a

+ *   previously initialized AVHWFramesContext, and calling this API function

+ *   only to test whether the required frame parameters have changed.

+ * - Fields that use dynamically allocated values of any kind must not be set

+ *   by the user unless setting them is explicitly allowed by the documentation.

+ *   If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,

+ *   the new free callback must call the potentially set previous free callback.

+ *   This API call may set any dynamically allocated fields, including the free

+ *   callback.

+ *

+ * The function will set at least the following fields on AVHWFramesContext

+ * (potentially more, depending on hwaccel API):

+ *

+ * - All fields set by av_hwframe_ctx_alloc().

+ * - Set the format field to hw_pix_fmt.

+ * - Set the sw_format field to the most suited and most versatile format. (An

+ *   implication is that this will prefer generic formats over opaque formats

+ *   with arbitrary restrictions, if possible.)

+ * - Set the width/height fields to the coded frame size, rounded up to the

+ *   API-specific minimum alignment.

+ * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size

+ *   field to the number of maximum reference surfaces possible with the codec,

+ *   plus 1 surface for the user to work (meaning the user can safely reference

+ *   at most 1 decoded surface at a time), plus additional buffering introduced

+ *   by frame threading. If the hwaccel does not require pre-allocation, the

+ *   field is left to 0, and the decoder will allocate new surfaces on demand

+ *   during decoding.

+ * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying

+ *   hardware API.

+ *

+ * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but

+ * with basic frame parameters set.

+ *

+ * The function is stateless, and does not change the AVCodecContext or the

+ * device_ref AVHWDeviceContext.

+ *

+ * @param avctx The context which is currently calling get_format, and which

+ *              implicitly contains all state needed for filling the returned

+ *              AVHWFramesContext properly.

+ * @param device_ref A reference to the AVHWDeviceContext describing the device

+ *                   which will be used by the hardware decoder.

+ * @param hw_pix_fmt The hwaccel format you are going to return from get_format.

+ * @param out_frames_ref On success, set to a reference to an _uninitialized_

+ *                       AVHWFramesContext, created from the given device_ref.

+ *                       Fields will be set to values required for decoding.

+ *                       Not changed if an error is returned.

+ * @return zero on success, a negative value on error. The following error codes

+ *         have special semantics:

+ *      AVERROR(ENOENT): the decoder does not support this functionality. Setup

+ *                       is always manual, or it is a decoder which does not

+ *                       support setting AVCodecContext.hw_frames_ctx at all,

+ *                       or it is a software format.

+ *      AVERROR(EINVAL): it is known that hardware decoding is not supported for

+ *                       this configuration, or the device_ref is not supported

+ *                       for the hwaccel referenced by hw_pix_fmt.

+ */

+int avcodec_get_hw_frames_parameters(AVCodecContext *avctx,

+                                     AVBufferRef *device_ref,

+                                     enum AVPixelFormat hw_pix_fmt,

+                                     AVBufferRef **out_frames_ref);

+

+

 /**

  * @defgroup lavc_parsing Frame parsing

@@ -1106,6 +1106,86 @@ static AVHWAccel *find_hwaccel(AVCodecContext *avctx,

     return NULL;

 }

+int ff_decode_get_hw_frames_ctx(AVCodecContext *avctx,

+                                enum AVHWDeviceType dev_type)

+{

+    AVHWDeviceContext *device_ctx;

+    AVHWFramesContext *frames_ctx;

+    int ret;

+

+    if (!avctx->hwaccel)

+        return AVERROR(ENOSYS);

+

+    if (avctx->hw_frames_ctx)

+        return 0;

+    if (!avctx->hw_device_ctx) {

+        av_log(avctx, AV_LOG_ERROR, "A hardware frames or device context is "

+                "required for hardware accelerated decoding.\n");

+        return AVERROR(EINVAL);

+    }

+

+    device_ctx = (AVHWDeviceContext *)avctx->hw_device_ctx->data;

+    if (device_ctx->type != dev_type) {

+        av_log(avctx, AV_LOG_ERROR, "Device type %s expected for hardware "

+               "decoding, but got %s.\n", av_hwdevice_get_type_name(dev_type),

+               av_hwdevice_get_type_name(device_ctx->type));

+        return AVERROR(EINVAL);

+    }

+

+    ret = avcodec_get_hw_frames_parameters(avctx,

+                                           avctx->hw_device_ctx,

+                                           avctx->hwaccel->pix_fmt,

+                                           &avctx->hw_frames_ctx);

+    if (ret < 0)

+        return ret;

+

+    frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;

+

+

+    if (frames_ctx->initial_pool_size) {

+        // We guarantee 4 base work surfaces. The function above guarantees 1

+        // (the absolute minimum), so add the missing count.

+        frames_ctx->initial_pool_size += 3;

+

+        // Add an additional surface per thread is frame threading is enabled.

+        if (avctx->active_thread_type & FF_THREAD_FRAME)

+            frames_ctx->initial_pool_size += avctx->thread_count;

+    }

+

+    ret = av_hwframe_ctx_init(avctx->hw_frames_ctx);

+    if (ret < 0) {

+        av_buffer_unref(&avctx->hw_frames_ctx);

+        return ret;

+    }

+

+    return 0;

+}

+

+int avcodec_get_hw_frames_parameters(AVCodecContext *avctx,

+                                     AVBufferRef *device_ref,

+                                     enum AVPixelFormat hw_pix_fmt,

+                                     AVBufferRef **out_frames_ref)

+{

+    AVBufferRef *frames_ref = NULL;

+    AVHWAccel *hwa = find_hwaccel(avctx, hw_pix_fmt);

+    int ret;

+

+    if (!hwa || !hwa->frame_params)

+        return AVERROR(ENOENT);

+

+    frames_ref = av_hwframe_ctx_alloc(device_ref);

+    if (!frames_ref)

+        return AVERROR(ENOMEM);

+

+    ret = hwa->frame_params(avctx, frames_ref);

+    if (ret >= 0) {

+        *out_frames_ref = frames_ref;

+    } else {

+        av_buffer_unref(&frames_ref);

+    }

+    return ret;

+}

+

 static int setup_hwaccel(AVCodecContext *avctx,

                          const enum AVPixelFormat fmt,

                          const char *name)

@@ -24,6 +24,10 @@

 #include "libavutil/buffer.h"

 #include "libavutil/frame.h"

+#include "libavutil/buffer.h"

+#include "libavutil/frame.h"

+#include "libavutil/hwcontext.h"

+

 #include "avcodec.h"

 /**

@@ -65,6 +69,14 @@ int ff_decode_get_packet(AVCodecContext *avctx, AVPacket *pkt);

 void ff_decode_bsfs_uninit(AVCodecContext *avctx);

+/**

+ * Make sure avctx.hw_frames_ctx is set. If it's not set, the function will

+ * try to allocate it from hw_device_ctx. If that is not possible, an error

+ * message is printed, and an error code is returned.

+ */

+int ff_decode_get_hw_frames_ctx(AVCodecContext *avctx,

+                                enum AVHWDeviceType dev_type);

+

 int ff_attach_decode_data(AVFrame *frame);

 #endif /* AVCODEC_DECODE_H */

@@ -29,6 +29,7 @@

 #include "libavutil/time.h"

 #include "avcodec.h"

+#include "decode.h"

 #include "dxva2_internal.h"

 /* define all the GUIDs used directly here,

@@ -576,14 +577,20 @@ static void ff_dxva2_unlock(AVCodecContext *avctx)

 #endif

 }

-// This must work before the decoder is created.

-// This somehow needs to be exported to the user.

-static void dxva_adjust_hwframes(AVCodecContext *avctx, AVHWFramesContext *frames_ctx)

+int ff_dxva2_common_frame_params(AVCodecContext *avctx,

+                                 AVBufferRef *hw_frames_ctx)

 {

-    FFDXVASharedContext *sctx = DXVA_SHARED_CONTEXT(avctx);

+    AVHWFramesContext *frames_ctx = (AVHWFramesContext *)hw_frames_ctx->data;

+    AVHWDeviceContext *device_ctx = frames_ctx->device_ctx;

     int surface_alignment, num_surfaces;

-    frames_ctx->format = sctx->pix_fmt;

+    if (device_ctx->type == AV_HWDEVICE_TYPE_DXVA2) {

+        frames_ctx->format = AV_PIX_FMT_DXVA2_VLD;

+    } else if (device_ctx->type == AV_HWDEVICE_TYPE_D3D11VA) {

+        frames_ctx->format = AV_PIX_FMT_D3D11;

+    } else {

+        return AVERROR(EINVAL);

+    }

     /* decoding MPEG-2 requires additional alignment on some Intel GPUs,

     but it causes issues for H.264 on certain AMD GPUs..... */

@@ -596,8 +603,8 @@ static void dxva_adjust_hwframes(AVCodecContext *avctx, AVHWFramesContext *frame

     else

         surface_alignment = 16;

-    /* 4 base work surfaces */

-    num_surfaces = 4;

+    /* 1 base work surface */

+    num_surfaces = 1;

     /* add surfaces based on number of possible refs */

     if (avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_HEVC)

@@ -633,12 +640,16 @@ static void dxva_adjust_hwframes(AVCodecContext *avctx, AVHWFramesContext *frame

         frames_hwctx->BindFlags |= D3D11_BIND_DECODER;

     }

 #endif

+

+    return 0;

 }

 int ff_dxva2_decode_init(AVCodecContext *avctx)

 {

     FFDXVASharedContext *sctx = DXVA_SHARED_CONTEXT(avctx);

-    AVHWFramesContext *frames_ctx = NULL;

+    AVHWFramesContext *frames_ctx;

+    enum AVHWDeviceType dev_type = avctx->hwaccel->pix_fmt == AV_PIX_FMT_DXVA2_VLD

+                            ? AV_HWDEVICE_TYPE_DXVA2 : AV_HWDEVICE_TYPE_D3D11VA;

     int ret = 0;

     // Old API.

@@ -648,32 +659,14 @@ int ff_dxva2_decode_init(AVCodecContext *avctx)

     // (avctx->pix_fmt is not updated yet at this point)

     sctx->pix_fmt = avctx->hwaccel->pix_fmt;

-    if (!avctx->hw_frames_ctx && !avctx->hw_device_ctx) {

-        av_log(avctx, AV_LOG_ERROR, "Either a hw_frames_ctx or a hw_device_ctx needs to be set for hardware decoding.\n");

-        return AVERROR(EINVAL);

-    }

-

-    if (avctx->hw_frames_ctx) {

-        frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;

-    } else {

-        avctx->hw_frames_ctx = av_hwframe_ctx_alloc(avctx->hw_device_ctx);

-        if (!avctx->hw_frames_ctx)

-            return AVERROR(ENOMEM);

-

-        frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;

-

-        dxva_adjust_hwframes(avctx, frames_ctx);

-

-        ret = av_hwframe_ctx_init(avctx->hw_frames_ctx);

-        if (ret < 0)

-            goto fail;

-    }

+    ret = ff_decode_get_hw_frames_ctx(avctx, dev_type);

+    if (ret < 0)

+        return ret;

+    frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;

     sctx->device_ctx = frames_ctx->device_ctx;

-    if (frames_ctx->format != sctx->pix_fmt ||

-        !((sctx->pix_fmt == AV_PIX_FMT_D3D11 && CONFIG_D3D11VA) ||

-          (sctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD && CONFIG_DXVA2))) {

+    if (frames_ctx->format != sctx->pix_fmt) {

         av_log(avctx, AV_LOG_ERROR, "Invalid pixfmt for hwaccel!\n");

         ret = AVERROR(EINVAL);

         goto fail;

@@ -528,6 +528,7 @@ AVHWAccel ff_h264_dxva2_hwaccel = {

     .start_frame    = dxva2_h264_start_frame,

     .decode_slice   = dxva2_h264_decode_slice,

     .end_frame      = dxva2_h264_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -544,6 +545,7 @@ AVHWAccel ff_h264_d3d11va_hwaccel = {

     .start_frame    = dxva2_h264_start_frame,

     .decode_slice   = dxva2_h264_decode_slice,

     .end_frame      = dxva2_h264_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -560,6 +562,7 @@ AVHWAccel ff_h264_d3d11va2_hwaccel = {

     .start_frame    = dxva2_h264_start_frame,

     .decode_slice   = dxva2_h264_decode_slice,

     .end_frame      = dxva2_h264_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -432,6 +432,7 @@ AVHWAccel ff_hevc_dxva2_hwaccel = {

     .start_frame    = dxva2_hevc_start_frame,

     .decode_slice   = dxva2_hevc_decode_slice,

     .end_frame      = dxva2_hevc_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct hevc_dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -448,6 +449,7 @@ AVHWAccel ff_hevc_d3d11va_hwaccel = {

     .start_frame    = dxva2_hevc_start_frame,

     .decode_slice   = dxva2_hevc_decode_slice,

     .end_frame      = dxva2_hevc_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct hevc_dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -464,6 +466,7 @@ AVHWAccel ff_hevc_d3d11va2_hwaccel = {

     .start_frame    = dxva2_hevc_start_frame,

     .decode_slice   = dxva2_hevc_decode_slice,

     .end_frame      = dxva2_hevc_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct hevc_dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -156,6 +156,9 @@ int ff_dxva2_decode_init(AVCodecContext *avctx);

 int ff_dxva2_decode_uninit(AVCodecContext *avctx);

+int ff_dxva2_common_frame_params(AVCodecContext *avctx,

+                                 AVBufferRef *hw_frames_ctx);

+

 int ff_dxva2_is_d3d11(const AVCodecContext *avctx);

 #endif /* AVCODEC_DXVA2_INTERNAL_H */

@@ -327,6 +327,7 @@ AVHWAccel ff_mpeg2_dxva2_hwaccel = {

     .start_frame    = dxva2_mpeg2_start_frame,

     .decode_slice   = dxva2_mpeg2_decode_slice,

     .end_frame      = dxva2_mpeg2_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -343,6 +344,7 @@ AVHWAccel ff_mpeg2_d3d11va_hwaccel = {

     .start_frame    = dxva2_mpeg2_start_frame,

     .decode_slice   = dxva2_mpeg2_decode_slice,

     .end_frame      = dxva2_mpeg2_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -359,6 +361,7 @@ AVHWAccel ff_mpeg2_d3d11va2_hwaccel = {

     .start_frame    = dxva2_mpeg2_start_frame,

     .decode_slice   = dxva2_mpeg2_decode_slice,

     .end_frame      = dxva2_mpeg2_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -388,6 +388,7 @@ AVHWAccel ff_wmv3_dxva2_hwaccel = {

     .start_frame    = dxva2_vc1_start_frame,

     .decode_slice   = dxva2_vc1_decode_slice,

     .end_frame      = dxva2_vc1_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -404,6 +405,7 @@ AVHWAccel ff_vc1_dxva2_hwaccel = {

     .start_frame    = dxva2_vc1_start_frame,

     .decode_slice   = dxva2_vc1_decode_slice,

     .end_frame      = dxva2_vc1_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -420,6 +422,7 @@ AVHWAccel ff_wmv3_d3d11va_hwaccel = {

     .start_frame    = dxva2_vc1_start_frame,

     .decode_slice   = dxva2_vc1_decode_slice,

     .end_frame      = dxva2_vc1_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -436,6 +439,7 @@ AVHWAccel ff_wmv3_d3d11va2_hwaccel = {

     .start_frame    = dxva2_vc1_start_frame,

     .decode_slice   = dxva2_vc1_decode_slice,

     .end_frame      = dxva2_vc1_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -452,6 +456,7 @@ AVHWAccel ff_vc1_d3d11va_hwaccel = {

     .start_frame    = dxva2_vc1_start_frame,

     .decode_slice   = dxva2_vc1_decode_slice,

     .end_frame      = dxva2_vc1_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -319,6 +319,7 @@ AVHWAccel ff_vp9_dxva2_hwaccel = {

     .start_frame    = dxva2_vp9_start_frame,

     .decode_slice   = dxva2_vp9_decode_slice,

     .end_frame      = dxva2_vp9_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct vp9_dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -335,6 +336,7 @@ AVHWAccel ff_vp9_d3d11va_hwaccel = {

     .start_frame    = dxva2_vp9_start_frame,

     .decode_slice   = dxva2_vp9_decode_slice,

     .end_frame      = dxva2_vp9_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct vp9_dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -351,6 +353,7 @@ AVHWAccel ff_vp9_d3d11va2_hwaccel = {

     .start_frame    = dxva2_vp9_start_frame,

     .decode_slice   = dxva2_vp9_decode_slice,

     .end_frame      = dxva2_vp9_end_frame,

+    .frame_params   = ff_dxva2_common_frame_params,

     .frame_priv_data_size = sizeof(struct vp9_dxva2_picture_context),

     .priv_data_size = sizeof(FFDXVASharedContext),

 };

@@ -21,6 +21,7 @@

 #include "libavutil/pixdesc.h"

 #include "avcodec.h"

+#include "decode.h"

 #include "internal.h"

 #include "vaapi_decode.h"

@@ -272,10 +273,15 @@ static const struct {

 #undef MAP

 };

-static int vaapi_decode_make_config(AVCodecContext *avctx)

+/*

+ * Set *va_config and the frames_ref fields from the current codec parameters

+ * in avctx.

+ */

+static int vaapi_decode_make_config(AVCodecContext *avctx,

+                                    AVBufferRef *device_ref,

+                                    VAConfigID *va_config,

+                                    AVBufferRef *frames_ref)

 {

-    VAAPIDecodeContext *ctx = avctx->internal->hwaccel_priv_data;

-

     AVVAAPIHWConfig       *hwconfig    = NULL;

     AVHWFramesConstraints *constraints = NULL;

     VAStatus vas;

@@ -285,13 +291,16 @@ static int vaapi_decode_make_config(AVCodecContext *avctx)

     int profile_count, exact_match, alt_profile;

     const AVPixFmtDescriptor *sw_desc, *desc;

+    AVHWDeviceContext    *device = (AVHWDeviceContext*)device_ref->data;

+    AVVAAPIDeviceContext *hwctx = device->hwctx;

+

     codec_desc = avcodec_descriptor_get(avctx->codec_id);

     if (!codec_desc) {

         err = AVERROR(EINVAL);

         goto fail;

     }

-    profile_count = vaMaxNumProfiles(ctx->hwctx->display);

+    profile_count = vaMaxNumProfiles(hwctx->display);

     profile_list  = av_malloc_array(profile_count,

                                     sizeof(VAProfile));

     if (!profile_list) {

@@ -299,7 +308,7 @@ static int vaapi_decode_make_config(AVCodecContext *avctx)

         goto fail;

     }

-    vas = vaQueryConfigProfiles(ctx->hwctx->display,

+    vas = vaQueryConfigProfiles(hwctx->display,

                                 profile_list, &profile_count);

     if (vas != VA_STATUS_SUCCESS) {

         av_log(avctx, AV_LOG_ERROR, "Failed to query profiles: "

@@ -358,12 +367,9 @@ static int vaapi_decode_make_config(AVCodecContext *avctx)

         }

     }

-    ctx->va_profile    = profile;

-    ctx->va_entrypoint = VAEntrypointVLD;

-

-    vas = vaCreateConfig(ctx->hwctx->display, ctx->va_profile,

-                         ctx->va_entrypoint, NULL, 0,

-                         &ctx->va_config);

+    vas = vaCreateConfig(hwctx->display, profile,

+                         VAEntrypointVLD, NULL, 0,

+                         va_config);

     if (vas != VA_STATUS_SUCCESS) {

         av_log(avctx, AV_LOG_ERROR, "Failed to create decode "

                "configuration: %d (%s).\n", vas, vaErrorStr(vas));

@@ -371,20 +377,15 @@ static int vaapi_decode_make_config(AVCodecContext *avctx)

         goto fail;

     }

-    hwconfig = av_hwdevice_hwconfig_alloc(avctx->hw_device_ctx ?

-                                          avctx->hw_device_ctx :

-                                          ctx->frames->device_ref);

+    hwconfig = av_hwdevice_hwconfig_alloc(device_ref);

     if (!hwconfig) {

         err = AVERROR(ENOMEM);

         goto fail;

     }

-    hwconfig->config_id = ctx->va_config;

+    hwconfig->config_id = *va_config;

     constraints =

-        av_hwdevice_get_hwframe_constraints(avctx->hw_device_ctx ?

-                                            avctx->hw_device_ctx :

-                                            ctx->frames->device_ref,

-                                            hwconfig);

+        av_hwdevice_get_hwframe_constraints(device_ref, hwconfig);

     if (!constraints) {

         err = AVERROR(ENOMEM);

         goto fail;

@@ -410,48 +411,52 @@ static int vaapi_decode_make_config(AVCodecContext *avctx)

         goto fail;

     }

-    // Find the first format in the list which matches the expected

-    // bit depth and subsampling.  If none are found (this can happen

-    // when 10-bit streams are decoded to 8-bit surfaces, for example)

-    // then just take the first format on the list.

-    ctx->surface_format = constraints->valid_sw_formats[0];

-    sw_desc = av_pix_fmt_desc_get(avctx->sw_pix_fmt);

-    for (i = 0; constraints->valid_sw_formats[i] != AV_PIX_FMT_NONE; i++) {

-        desc = av_pix_fmt_desc_get(constraints->valid_sw_formats[i]);

-        if (desc->nb_components != sw_desc->nb_components ||

-            desc->log2_chroma_w != sw_desc->log2_chroma_w ||

-            desc->log2_chroma_h != sw_desc->log2_chroma_h)

-            continue;

-        for (j = 0; j < desc->nb_components; j++) {

-            if (desc->comp[j].depth != sw_desc->comp[j].depth)

-                break;

+    if (frames_ref) {

+        AVHWFramesContext *frames = (AVHWFramesContext *)frames_ref->data;

+

+        frames->format = AV_PIX_FMT_VAAPI;

+        frames->width = avctx->coded_width;

+        frames->height = avctx->coded_height;

+

+        // Find the first format in the list which matches the expected

+        // bit depth and subsampling.  If none are found (this can happen

+        // when 10-bit streams are decoded to 8-bit surfaces, for example)

+        // then just take the first format on the list.

+        frames->sw_format = constraints->valid_sw_formats[0];

+        sw_desc = av_pix_fmt_desc_get(avctx->sw_pix_fmt);

+        for (i = 0; constraints->valid_sw_formats[i] != AV_PIX_FMT_NONE; i++) {

+            desc = av_pix_fmt_desc_get(constraints->valid_sw_formats[i]);

+            if (desc->nb_components != sw_desc->nb_components ||

+                desc->log2_chroma_w != sw_desc->log2_chroma_w ||

+                desc->log2_chroma_h != sw_desc->log2_chroma_h)

+                continue;

+            for (j = 0; j < desc->nb_components; j++) {

+                if (desc->comp[j].depth != sw_desc->comp[j].depth)

+                    break;

+            }

+            if (j < desc->nb_components)

+                continue;

+            frames->sw_format = constraints->valid_sw_formats[i];

+            break;

         }

-        if (j < desc->nb_components)

-            continue;

-        ctx->surface_format = constraints->valid_sw_formats[i];

-        break;

-    }

-    // Start with at least four surfaces.

-    ctx->surface_count = 4;

-    // Add per-codec number of surfaces used for storing reference frames.

-    switch (avctx->codec_id) {

-    case AV_CODEC_ID_H264:

-    case AV_CODEC_ID_HEVC:

-        ctx->surface_count += 16;

-        break;

-    case AV_CODEC_ID_VP9:

-        ctx->surface_count += 8;

-        break;

-    case AV_CODEC_ID_VP8:

-        ctx->surface_count += 3;

-        break;

-    default:

-        ctx->surface_count += 2;

+        frames->initial_pool_size = 1;

+        // Add per-codec number of surfaces used for storing reference frames.

+        switch (avctx->codec_id) {

+        case AV_CODEC_ID_H264:

+        case AV_CODEC_ID_HEVC:

+            frames->initial_pool_size += 16;

+            break;

+        case AV_CODEC_ID_VP9:

+            frames->initial_pool_size += 8;

+            break;

+        case AV_CODEC_ID_VP8:

+            frames->initial_pool_size += 3;

+            break;

+        default:

+            frames->initial_pool_size += 2;

+        }

     }

-    // Add an additional surface per thread is frame threading is enabled.

-    if (avctx->active_thread_type & FF_THREAD_FRAME)

-        ctx->surface_count += avctx->thread_count;

     av_hwframe_constraints_free(&constraints);

     av_freep(&hwconfig);

@@ -461,14 +466,38 @@ static int vaapi_decode_make_config(AVCodecContext *avctx)

 fail:

     av_hwframe_constraints_free(&constraints);

     av_freep(&hwconfig);

-    if (ctx->va_config != VA_INVALID_ID) {

-        vaDestroyConfig(ctx->hwctx->display, ctx->va_config);

-        ctx->va_config = VA_INVALID_ID;

+    if (*va_config != VA_INVALID_ID) {

+        vaDestroyConfig(hwctx->display, *va_config);

+        *va_config = VA_INVALID_ID;

     }

     av_freep(&profile_list);

     return err;

 }

+int ff_vaapi_common_frame_params(AVCodecContext *avctx,

+                                 AVBufferRef *hw_frames_ctx)

+{

+    AVHWFramesContext *hw_frames = (AVHWFramesContext *)hw_frames_ctx->data;

+    AVHWDeviceContext *device_ctx = hw_frames->device_ctx;

+    AVVAAPIDeviceContext *hwctx;

+    VAConfigID va_config = VA_INVALID_ID;

+    int err;

+

+    if (device_ctx->type != AV_HWDEVICE_TYPE_VAAPI)

+        return AVERROR(EINVAL);

+    hwctx = device_ctx->hwctx;

+

+    err = vaapi_decode_make_config(avctx, hw_frames->device_ref, &va_config,

+                                   hw_frames_ctx);

+    if (err)

+        return err;

+

+    if (va_config != VA_INVALID_ID)

+        vaDestroyConfig(hwctx->display, va_config);

+

+    return 0;

+}

+

 int ff_vaapi_decode_init(AVCodecContext *avctx)

 {

     VAAPIDecodeContext *ctx = avctx->internal->hwaccel_priv_data;

@@ -505,36 +534,8 @@ int ff_vaapi_decode_init(AVCodecContext *avctx)

         ctx->hwctx->driver_quirks =

             AV_VAAPI_DRIVER_QUIRK_RENDER_PARAM_BUFFERS;

-    } else

-#endif

-    if (avctx->hw_frames_ctx) {

-        // This structure has a shorter lifetime than the enclosing

-        // AVCodecContext, so we inherit the references from there

-        // and do not need to make separate ones.

-

-        ctx->frames = (AVHWFramesContext*)avctx->hw_frames_ctx->data;

-        ctx->hwfc   = ctx->frames->hwctx;

-        ctx->device = ctx->frames->device_ctx;

-        ctx->hwctx  = ctx->device->hwctx;

-

-    } else if (avctx->hw_device_ctx) {

-        ctx->device = (AVHWDeviceContext*)avctx->hw_device_ctx->data;

-        ctx->hwctx  = ctx->device->hwctx;

-

-        if (ctx->device->type != AV_HWDEVICE_TYPE_VAAPI) {

-            av_log(avctx, AV_LOG_ERROR, "Device supplied for VAAPI "

-                   "decoding must be a VAAPI device (not %d).\n",

-                   ctx->device->type);

-            err = AVERROR(EINVAL);

-            goto fail;

-        }

-

-    } else {

-        av_log(avctx, AV_LOG_ERROR, "A hardware device or frames context "

-               "is required for VAAPI decoding.\n");

-        err = AVERROR(EINVAL);

-        goto fail;

     }

+#endif

 #if FF_API_STRUCT_VAAPI_CONTEXT

     if (ctx->have_old_context) {

@@ -546,34 +547,19 @@ int ff_vaapi_decode_init(AVCodecContext *avctx)

     } else {

 #endif

-    err = vaapi_decode_make_config(avctx);

-    if (err)

+    err = ff_decode_get_hw_frames_ctx(avctx, AV_HWDEVICE_TYPE_VAAPI);

+    if (err < 0)

         goto fail;

-    if (!avctx->hw_frames_ctx) {

-        avctx->hw_frames_ctx = av_hwframe_ctx_alloc(avctx->hw_device_ctx);

-        if (!avctx->hw_frames_ctx) {

-            err = AVERROR(ENOMEM);

-            goto fail;

-        }

-        ctx->frames = (AVHWFramesContext*)avctx->hw_frames_ctx->data;

-

-        ctx->frames->format = AV_PIX_FMT_VAAPI;

-        ctx->frames->width  = avctx->coded_width;

-        ctx->frames->height = avctx->coded_height;

-

-        ctx->frames->sw_format         = ctx->surface_format;

-        ctx->frames->initial_pool_size = ctx->surface_count;

+    ctx->frames = (AVHWFramesContext*)avctx->hw_frames_ctx->data;

+    ctx->hwfc   = ctx->frames->hwctx;

+    ctx->device = ctx->frames->device_ctx;

+    ctx->hwctx  = ctx->device->hwctx;

-        err = av_hwframe_ctx_init(avctx->hw_frames_ctx);

-        if (err < 0) {

-            av_log(avctx, AV_LOG_ERROR, "Failed to initialise internal "

-                   "frames context: %d.\n", err);

-            goto fail;

-        }

-

-        ctx->hwfc = ctx->frames->hwctx;

-    }

+    err = vaapi_decode_make_config(avctx, ctx->frames->device_ref,

+                                   &ctx->va_config, avctx->hw_frames_ctx);

+    if (err)

+        goto fail;

     vas = vaCreateContext(ctx->hwctx->display, ctx->va_config,

                           avctx->coded_width, avctx->coded_height,

@@ -53,8 +53,6 @@ typedef struct VAAPIDecodePicture {

 } VAAPIDecodePicture;

 typedef struct VAAPIDecodeContext {

-    VAProfile             va_profile;

-    VAEntrypoint          va_entrypoint;

     VAConfigID            va_config;

     VAContextID           va_context;

@@ -98,4 +96,7 @@ int ff_vaapi_decode_cancel(AVCodecContext *avctx,

 int ff_vaapi_decode_init(AVCodecContext *avctx);

 int ff_vaapi_decode_uninit(AVCodecContext *avctx);

+int ff_vaapi_common_frame_params(AVCodecContext *avctx,

+                                 AVBufferRef *hw_frames_ctx);

+

 #endif /* AVCODEC_VAAPI_DECODE_H */

@@ -399,6 +399,7 @@ AVHWAccel ff_h264_vaapi_hwaccel = {

     .frame_priv_data_size = sizeof(VAAPIDecodePicture),

     .init                 = &ff_vaapi_decode_init,

     .uninit               = &ff_vaapi_decode_uninit,

+    .frame_params         = &ff_vaapi_common_frame_params,

     .priv_data_size       = sizeof(VAAPIDecodeContext),

     .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,

 };

@@ -434,6 +434,7 @@ AVHWAccel ff_hevc_vaapi_hwaccel = {

     .frame_priv_data_size = sizeof(VAAPIDecodePictureHEVC),

     .init                 = ff_vaapi_decode_init,

     .uninit               = ff_vaapi_decode_uninit,

+    .frame_params         = ff_vaapi_common_frame_params,

     .priv_data_size       = sizeof(VAAPIDecodeContext),

     .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,

 };

@@ -183,6 +183,7 @@ AVHWAccel ff_mpeg2_vaapi_hwaccel = {

     .frame_priv_data_size = sizeof(VAAPIDecodePicture),

     .init                 = &ff_vaapi_decode_init,

     .uninit               = &ff_vaapi_decode_uninit,

+    .frame_params         = &ff_vaapi_common_frame_params,

     .priv_data_size       = sizeof(VAAPIDecodeContext),

     .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,

 };

@@ -189,6 +189,7 @@ AVHWAccel ff_mpeg4_vaapi_hwaccel = {

     .frame_priv_data_size = sizeof(VAAPIDecodePicture),

     .init                 = &ff_vaapi_decode_init,

     .uninit               = &ff_vaapi_decode_uninit,

+    .frame_params         = &ff_vaapi_common_frame_params,

     .priv_data_size       = sizeof(VAAPIDecodeContext),

     .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,

 };

@@ -206,6 +207,7 @@ AVHWAccel ff_h263_vaapi_hwaccel = {

     .frame_priv_data_size = sizeof(VAAPIDecodePicture),

     .init                 = &ff_vaapi_decode_init,

     .uninit               = &ff_vaapi_decode_uninit,

+    .frame_params         = &ff_vaapi_common_frame_params,

     .priv_data_size       = sizeof(VAAPIDecodeContext),

     .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,

 };