[FFmpeg-devel] [PATCH V2] examples/vaapi_encode: Add a VA-API encode example.

Jun Zhao mypopydev at gmail.com
Tue Nov 7 05:15:37 EET 2017


V2: Fix the build error (avfiltergraph.h have been remove with merge
99ba85a0).
-------------- next part --------------
From 48fa48129de4f81812c2c11faf30fff7312640d4 Mon Sep 17 00:00:00 2001
From: Jun Zhao <jun.zhao at intel.com>
Date: Mon, 6 Nov 2017 14:45:27 +0800
Subject: [PATCH V2] examples/vaapi_encode: Add a VA-API encode example.

add a VA-API encode example, only support NV12 input, usage like:
./vaapi_encode 1920 1080 test.yuv test.h264

Signed-off-by: Jun Zhao <jun.zhao at intel.com>
Signed-off-by: Liu, Kaixuan <kaixuan.liu at intel.com>
---
 configure                   |   2 +
 doc/examples/Makefile       |   1 +
 doc/examples/vaapi_encode.c | 308 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 311 insertions(+)
 create mode 100644 doc/examples/vaapi_encode.c

diff --git a/configure b/configure
index 83b4cc9364..a4d39712c3 100755
--- a/configure
+++ b/configure
@@ -1524,6 +1524,7 @@ EXAMPLE_LIST="
     scaling_video_example
     transcode_aac_example
     transcoding_example
+    vaapi_encode_example
 "
 
 EXTERNAL_AUTODETECT_LIBRARY_LIST="
@@ -3294,6 +3295,7 @@ resampling_audio_example_deps="avutil swresample"
 scaling_video_example_deps="avutil swscale"
 transcode_aac_example_deps="avcodec avformat swresample"
 transcoding_example_deps="avfilter avcodec avformat avutil"
+vaapi_encode_example_deps="avfilter avcodec avformat avutil"
 
 # EXTRALIBS_LIST
 cpu_init_extralibs="pthreads_extralibs"
diff --git a/doc/examples/Makefile b/doc/examples/Makefile
index 58afd71b85..da5af36532 100644
--- a/doc/examples/Makefile
+++ b/doc/examples/Makefile
@@ -19,6 +19,7 @@ EXAMPLES-$(CONFIG_RESAMPLING_AUDIO_EXAMPLE)  += resampling_audio
 EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE)     += scaling_video
 EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE)     += transcode_aac
 EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE)       += transcoding
+EXAMPLES-$(CONFIG_VAAPI_ENCODE_EXAMPLE)      += vaapi_encode
 
 EXAMPLES       := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF))
 EXAMPLES_G     := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)_g$(EXESUF))
diff --git a/doc/examples/vaapi_encode.c b/doc/examples/vaapi_encode.c
new file mode 100644
index 0000000000..462ae47b5a
--- /dev/null
+++ b/doc/examples/vaapi_encode.c
@@ -0,0 +1,308 @@
+/*
+ * Video Acceleration API (video encoding) encode sample
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Intel VAAPI-accelerated encoding example.
+ *
+ * @example vaapi_encode.c
+ * This example shows how to do VAAPI-accelerated encoding. now only support NV12
+ * raw file, usage like: vaapi_enc 1920 1080 input.yuv output.h264
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libavfilter/avfilter.h>
+#include <libavfilter/buffersink.h>
+#include <libavfilter/buffersrc.h>
+#include <libavutil/pixdesc.h>
+#include <libavutil/hwcontext.h>
+
+typedef struct FilterContext {
+    AVFilterContext *buffersink_ctx;
+    AVFilterContext *buffersrc_ctx;
+    AVFilterGraph   *filter_graph;
+} FilterContext;
+
+static int width, height;
+static AVBufferRef *hw_device_ctx = NULL;
+
+static int init_filter(FilterContext *filter_ctx, char *args, AVBufferRef *hw_device_ctx)
+{
+    char filter_spec[] = "format=nv12,hwupload";
+    int  ret = 0, i = 0;
+    const AVFilter *buffersrc, *buffersink;
+    AVFilterContext *buffersrc_ctx, *buffersink_ctx;
+    AVFilterInOut *outputs = avfilter_inout_alloc();
+    AVFilterInOut *inputs  = avfilter_inout_alloc();
+    AVFilterGraph *filter_graph = avfilter_graph_alloc();
+
+    buffersrc = avfilter_get_by_name("buffer");
+    buffersink = avfilter_get_by_name("buffersink");
+    if (!buffersrc || !buffersink) {
+        av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
+        ret = AVERROR_UNKNOWN;
+        goto fail;
+    }
+
+    ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
+                                       args, NULL, filter_graph);
+    if (ret < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source. Error code:%s\n", av_err2str(ret));
+        goto fail;
+    }
+    ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
+                                       NULL, NULL, filter_graph);
+    if (ret < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink. Error code:%s\n", av_err2str(ret));
+        goto fail;
+    }
+
+    outputs->name       = av_strdup("in");
+    outputs->filter_ctx = buffersrc_ctx;
+    outputs->pad_idx    = 0;
+    outputs->next       = NULL;
+    inputs->name        = av_strdup("out");
+    inputs->filter_ctx  = buffersink_ctx;
+    inputs->pad_idx     = 0;
+    inputs->next        = NULL;
+    if (!outputs->name || !inputs->name) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
+                                        &inputs, &outputs, NULL)) < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Error code: %s\n", av_err2str(ret));
+        goto fail;
+    }
+
+    if (hw_device_ctx) {
+        for (i = 0; i < filter_graph->nb_filters; i++) {
+            filter_graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
+        }
+    }
+
+    if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Fail to config filter graph. Error code: %s\n", av_err2str(ret));
+        goto fail;
+    }
+
+    filter_ctx->buffersrc_ctx  = buffersrc_ctx;
+    filter_ctx->buffersink_ctx = buffersink_ctx;
+    filter_ctx->filter_graph   = filter_graph;
+
+fail:
+    avfilter_inout_free(&inputs);
+    avfilter_inout_free(&outputs);
+    return ret;
+}
+
+static int encode_write(AVCodecContext *avctx, AVFrame *frame, FILE *fout)
+{
+    int ret = 0;
+    AVPacket enc_pkt;
+
+    av_init_packet(&enc_pkt);
+    enc_pkt.data = NULL;
+    enc_pkt.size = 0;
+
+    if ((ret = avcodec_send_frame(avctx, frame)) < 0) {
+        fprintf(stderr, "Error code: %s\n", av_err2str(ret));
+        goto end;
+    }
+    while (1) {
+        ret = avcodec_receive_packet(avctx, &enc_pkt);
+        if (ret)
+            break;
+
+        enc_pkt.stream_index = 0;
+        ret = fwrite(enc_pkt.data, enc_pkt.size, 1, fout);
+    }
+
+end:
+    ret = ((ret == AVERROR(EAGAIN)) ? 0 : -1);
+    return ret;
+}
+
+int main(int argc, char *argv[])
+{
+    int ret, size;
+    FILE *fin = NULL, *fout = NULL;
+    AVFrame *sw_frame = NULL, *hw_frame = NULL;
+    AVCodecContext *avctx = NULL;
+    FilterContext *filter_ctx = NULL;
+    AVCodec *codec = NULL;
+    const char *enc_name = "h264_vaapi";
+    char args[512];
+
+    if (argc < 4) {
+        fprintf(stderr, "Usage: %s <width> <height> <input file> <output file>\n", argv[0]);
+        return -1;
+    }
+
+    width  = atoi(argv[1]);
+    height = atoi(argv[2]);
+    size   = width * height;
+
+    if (!(fin = fopen(argv[3], "r"))) {
+        fprintf(stderr, "Fail to open input file : %s\n", strerror(errno));
+        ret = -1;
+        goto close;
+    }
+    if (!(fout = fopen(argv[4], "w+b"))) {
+        fprintf(stderr, "Fail to open output file : %s\n", strerror(errno));
+        ret = -1;
+        goto close;
+    }
+
+    av_register_all();
+    avfilter_register_all();
+
+    ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI,
+                                 NULL, NULL, 0);
+    if (ret < 0) {
+        fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(ret));
+        goto close;
+    }
+
+    if (!(codec = avcodec_find_encoder_by_name(enc_name))) {
+        fprintf(stderr, "Could not find encoder.\n");
+        ret = -1;
+        goto close;
+    }
+
+    if (!(avctx = avcodec_alloc_context3(codec))) {
+        ret = AVERROR(ENOMEM);
+        goto close;
+    }
+
+    avctx->width     = width;
+    avctx->height    = height;
+    avctx->time_base = (AVRational){1, 25};
+    avctx->framerate = (AVRational){25, 1};
+    avctx->sample_aspect_ratio = (AVRational){1, 1};
+    avctx->pix_fmt   = AV_PIX_FMT_VAAPI;
+
+    /* create filters and binding HWDevice */
+    snprintf(args, sizeof(args),
+             "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d:frame_rate=%d/%d",
+             avctx->width, avctx->height, AV_PIX_FMT_NV12,
+             avctx->time_base.num, avctx->time_base.den,
+             avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den,
+             avctx->framerate.num, avctx->framerate.den);
+
+    if (!(filter_ctx = av_malloc(sizeof(*filter_ctx)))) {
+        ret = AVERROR(ENOMEM);
+        goto close;
+    }
+
+    if ((ret = init_filter(filter_ctx, args, hw_device_ctx)) < 0) {
+        fprintf(stderr, "Failed to initialize the filtering context.\n");
+        goto close;
+    }
+
+    avctx->hw_frames_ctx = av_buffer_ref(av_buffersink_get_hw_frames_ctx
+                                         (filter_ctx->buffersink_ctx));
+    if (!avctx->hw_frames_ctx) {
+        ret = AVERROR(ENOMEM);
+        goto close;
+    }
+
+    if ((ret = avcodec_open2(avctx, codec, NULL)) < 0) {
+        fprintf(stderr, "Cannot open video encoder codec. Error code: %s\n", av_err2str(ret));
+        goto close;
+    }
+
+    while (1) {
+        if (!(sw_frame = av_frame_alloc())) {
+            ret = AVERROR(ENOMEM);
+            goto close;
+        }
+        sw_frame->width  = width;
+        sw_frame->height = height;
+        sw_frame->format = AV_PIX_FMT_NV12;
+        if ((ret = av_frame_get_buffer(sw_frame, 32)) < 0)
+            goto close;
+        if ((ret = fread((uint8_t*)(sw_frame->data[0]), size, 1, fin)) <= 0)
+            break;
+        if ((ret = fread((uint8_t*)(sw_frame->data[1]), size/2, 1, fin)) <= 0)
+            break;
+        /* push the sw frame into the filtergraph */
+        ret = av_buffersrc_add_frame_flags(filter_ctx->buffersrc_ctx, sw_frame, 0);
+        if (ret < 0) {
+            fprintf(stderr, "Error while feeding the filtergraph. Error code: %s\n", av_err2str(ret));
+            goto close;
+        }
+        /* pull hw frames from the filtergraph */
+        while (1) {
+            if (!(hw_frame = av_frame_alloc())) {
+                ret = AVERROR(ENOMEM);
+                goto close;
+            }
+            if ((ret = (av_buffersink_get_frame(filter_ctx->buffersink_ctx, hw_frame))) < 0) {
+                /* if no more frames for output - returns AVERROR(EAGAIN)
+                 * if flushed and no more frames for output - returns AVERROR_EOF
+                 * rewrite retcode to 0 to show it as normal procedure completion
+                 */
+                if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+                    ret = 0;
+                av_frame_free(&hw_frame);
+                break;
+            }
+
+            if ((ret = (encode_write(avctx, hw_frame, fout))) < 0) {
+                fprintf(stderr, "Failed to encode.\n");
+                goto close;
+            }
+            av_frame_free(&hw_frame);
+        }
+        av_frame_free(&sw_frame);
+    }
+
+    /* flush encode */
+    ret = encode_write(avctx, NULL, fout);
+
+close:
+    if (fin)
+        fclose(fin);
+    if (fout)
+        fclose(fout);
+    if (sw_frame)
+        av_frame_free(&sw_frame);
+    if (hw_frame)
+        av_frame_free(&hw_frame);
+    if (avctx)
+        avcodec_free_context(&avctx);
+    if (filter_ctx) {
+        avfilter_free(filter_ctx->buffersrc_ctx);
+        avfilter_free(filter_ctx->buffersink_ctx);
+        avfilter_graph_free(&(filter_ctx->filter_graph));
+        av_free(filter_ctx);
+    }
+    if (hw_device_ctx)
+        av_buffer_unref(&hw_device_ctx);
+
+    return ret;
+}
-- 
2.14.1



More information about the ffmpeg-devel mailing list