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-rw-r--r--ffmpeg_vaapi.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/ffmpeg_vaapi.c b/ffmpeg_vaapi.c
new file mode 100644
index 0000000000..d011cacef7
--- /dev/null
+++ b/ffmpeg_vaapi.c
@@ -0,0 +1,233 @@
+/*
+ * 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 "config.h"
+
+#include "libavutil/avassert.h"
+#include "libavutil/frame.h"
+#include "libavutil/hwcontext.h"
+#include "libavutil/log.h"
+
+#include "ffmpeg.h"
+
+
+static AVClass vaapi_class = {
+ .class_name = "vaapi",
+ .item_name = av_default_item_name,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+#define DEFAULT_SURFACES 20
+
+typedef struct VAAPIDecoderContext {
+ const AVClass *class;
+
+ AVBufferRef *device_ref;
+ AVHWDeviceContext *device;
+ AVBufferRef *frames_ref;
+ AVHWFramesContext *frames;
+
+ // The output need not have the same format, width and height as the
+ // decoded frames - the copy for non-direct-mapped access is actually
+ // a whole vpp instance which can do arbitrary scaling and format
+ // conversion.
+ enum AVPixelFormat output_format;
+} VAAPIDecoderContext;
+
+
+static int vaapi_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
+{
+ InputStream *ist = avctx->opaque;
+ VAAPIDecoderContext *ctx = ist->hwaccel_ctx;
+ int err;
+
+ err = av_hwframe_get_buffer(ctx->frames_ref, frame, 0);
+ if (err < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to allocate decoder surface.\n");
+ } else {
+ av_log(ctx, AV_LOG_DEBUG, "Decoder given surface %#x.\n",
+ (unsigned int)(uintptr_t)frame->data[3]);
+ }
+ return err;
+}
+
+static int vaapi_retrieve_data(AVCodecContext *avctx, AVFrame *input)
+{
+ InputStream *ist = avctx->opaque;
+ VAAPIDecoderContext *ctx = ist->hwaccel_ctx;
+ AVFrame *output = 0;
+ int err;
+
+ av_assert0(input->format == AV_PIX_FMT_VAAPI);
+
+ if (ctx->output_format == AV_PIX_FMT_VAAPI) {
+ // Nothing to do.
+ return 0;
+ }
+
+ av_log(ctx, AV_LOG_DEBUG, "Retrieve data from surface %#x.\n",
+ (unsigned int)(uintptr_t)input->data[3]);
+
+ output = av_frame_alloc();
+ if (!output)
+ return AVERROR(ENOMEM);
+
+ output->format = ctx->output_format;
+
+ err = av_hwframe_transfer_data(output, input, 0);
+ if (err < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to transfer data to "
+ "output frame: %d.\n", err);
+ goto fail;
+ }
+
+ err = av_frame_copy_props(output, input);
+ if (err < 0) {
+ av_frame_unref(output);
+ goto fail;
+ }
+
+ av_frame_unref(input);
+ av_frame_move_ref(input, output);
+ av_frame_free(&output);
+
+ return 0;
+
+fail:
+ if (output)
+ av_frame_free(&output);
+ return err;
+}
+
+static void vaapi_decode_uninit(AVCodecContext *avctx)
+{
+ InputStream *ist = avctx->opaque;
+ VAAPIDecoderContext *ctx = ist->hwaccel_ctx;
+
+ if (ctx) {
+ av_buffer_unref(&ctx->frames_ref);
+ av_buffer_unref(&ctx->device_ref);
+ av_free(ctx);
+ }
+
+ av_buffer_unref(&ist->hw_frames_ctx);
+
+ ist->hwaccel_ctx = NULL;
+ ist->hwaccel_uninit = NULL;
+ ist->hwaccel_get_buffer = NULL;
+ ist->hwaccel_retrieve_data = NULL;
+}
+
+int vaapi_decode_init(AVCodecContext *avctx)
+{
+ InputStream *ist = avctx->opaque;
+ VAAPIDecoderContext *ctx;
+ int err;
+ int loglevel = (ist->hwaccel_id != HWACCEL_VAAPI ? AV_LOG_VERBOSE
+ : AV_LOG_ERROR);
+
+ if (ist->hwaccel_ctx)
+ vaapi_decode_uninit(avctx);
+
+ // We have -hwaccel without -vaapi_device, so just initialise here with
+ // the device passed as -hwaccel_device (if -vaapi_device was passed, it
+ // will always have been called before now).
+ if (!hw_device_ctx) {
+ err = vaapi_device_init(ist->hwaccel_device);
+ if (err < 0)
+ return err;
+ }
+
+ ctx = av_mallocz(sizeof(*ctx));
+ if (!ctx)
+ return AVERROR(ENOMEM);
+ ctx->class = &vaapi_class;
+ ist->hwaccel_ctx = ctx;
+
+ ctx->device_ref = av_buffer_ref(hw_device_ctx);
+ ctx->device = (AVHWDeviceContext*)ctx->device_ref->data;
+
+ ctx->output_format = ist->hwaccel_output_format;
+ avctx->pix_fmt = ctx->output_format;
+
+ ctx->frames_ref = av_hwframe_ctx_alloc(ctx->device_ref);
+ if (!ctx->frames_ref) {
+ av_log(ctx, loglevel, "Failed to create VAAPI frame context.\n");
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ ctx->frames = (AVHWFramesContext*)ctx->frames_ref->data;
+
+ ctx->frames->format = AV_PIX_FMT_VAAPI;
+ ctx->frames->width = avctx->coded_width;
+ ctx->frames->height = avctx->coded_height;
+
+ // It would be nice if we could query the available formats here,
+ // but unfortunately we don't have a VAConfigID to do it with.
+ // For now, just assume an NV12 format (or P010 if 10-bit).
+ ctx->frames->sw_format = (avctx->sw_pix_fmt == AV_PIX_FMT_YUV420P10 ?
+ AV_PIX_FMT_P010 : AV_PIX_FMT_NV12);
+
+ // For frame-threaded decoding, at least one additional surface
+ // is needed for each thread.
+ ctx->frames->initial_pool_size = DEFAULT_SURFACES;
+ if (avctx->active_thread_type & FF_THREAD_FRAME)
+ ctx->frames->initial_pool_size += avctx->thread_count;
+
+ err = av_hwframe_ctx_init(ctx->frames_ref);
+ if (err < 0) {
+ av_log(ctx, loglevel, "Failed to initialise VAAPI frame "
+ "context: %d\n", err);
+ goto fail;
+ }
+
+ ist->hw_frames_ctx = av_buffer_ref(ctx->frames_ref);
+ if (!ist->hw_frames_ctx) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ ist->hwaccel_uninit = &vaapi_decode_uninit;
+ ist->hwaccel_get_buffer = &vaapi_get_buffer;
+ ist->hwaccel_retrieve_data = &vaapi_retrieve_data;
+
+ return 0;
+
+fail:
+ vaapi_decode_uninit(avctx);
+ return err;
+}
+
+static AVClass *vaapi_log = &vaapi_class;
+
+av_cold int vaapi_device_init(const char *device)
+{
+ int err;
+
+ av_buffer_unref(&hw_device_ctx);
+
+ err = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI,
+ device, NULL, 0);
+ if (err < 0) {
+ av_log(&vaapi_log, AV_LOG_ERROR, "Failed to create a VAAPI device\n");
+ return err;
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-13 12:34:04 +0000