FFmpeg
vaapi_encode.c
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1 /*
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7  * furnished to do so, subject to the following conditions:
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9  * The above copyright notice and this permission notice shall be included in
10  * all copies or substantial portions of the Software.
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13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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17  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
18  * THE SOFTWARE.
19  */
20 
21 /**
22  * @file Intel VAAPI-accelerated encoding API usage example
23  * @example vaapi_encode.c
24  *
25  * Perform VAAPI-accelerated encoding. Read input from an NV12 raw
26  * file, and write the H.264 encoded data to an output raw file.
27  * Usage: vaapi_encode 1920 1080 input.yuv output.h264
28  */
29 
30 #include <stdio.h>
31 #include <string.h>
32 #include <errno.h>
33 
34 #include <libavcodec/avcodec.h>
35 #include <libavutil/pixdesc.h>
36 #include <libavutil/hwcontext.h>
37 
38 static int width, height;
39 static AVBufferRef *hw_device_ctx = NULL;
40 
42 {
43  AVBufferRef *hw_frames_ref;
44  AVHWFramesContext *frames_ctx = NULL;
45  int err = 0;
46 
47  if (!(hw_frames_ref = av_hwframe_ctx_alloc(hw_device_ctx))) {
48  fprintf(stderr, "Failed to create VAAPI frame context.\n");
49  return -1;
50  }
51  frames_ctx = (AVHWFramesContext *)(hw_frames_ref->data);
52  frames_ctx->format = AV_PIX_FMT_VAAPI;
53  frames_ctx->sw_format = AV_PIX_FMT_NV12;
54  frames_ctx->width = width;
55  frames_ctx->height = height;
56  frames_ctx->initial_pool_size = 20;
57  if ((err = av_hwframe_ctx_init(hw_frames_ref)) < 0) {
58  fprintf(stderr, "Failed to initialize VAAPI frame context."
59  "Error code: %s\n",av_err2str(err));
60  av_buffer_unref(&hw_frames_ref);
61  return err;
62  }
63  ctx->hw_frames_ctx = av_buffer_ref(hw_frames_ref);
64  if (!ctx->hw_frames_ctx)
65  err = AVERROR(ENOMEM);
66 
67  av_buffer_unref(&hw_frames_ref);
68  return err;
69 }
70 
71 static int encode_write(AVCodecContext *avctx, AVFrame *frame, FILE *fout)
72 {
73  int ret = 0;
74  AVPacket *enc_pkt;
75 
76  if (!(enc_pkt = av_packet_alloc()))
77  return AVERROR(ENOMEM);
78 
79  if ((ret = avcodec_send_frame(avctx, frame)) < 0) {
80  fprintf(stderr, "Error code: %s\n", av_err2str(ret));
81  goto end;
82  }
83  while (1) {
84  ret = avcodec_receive_packet(avctx, enc_pkt);
85  if (ret)
86  break;
87 
88  enc_pkt->stream_index = 0;
89  ret = fwrite(enc_pkt->data, enc_pkt->size, 1, fout);
90  av_packet_unref(enc_pkt);
91  }
92 
93 end:
94  av_packet_free(&enc_pkt);
95  ret = ((ret == AVERROR(EAGAIN)) ? 0 : -1);
96  return ret;
97 }
98 
99 int main(int argc, char *argv[])
100 {
101  int size, err;
102  FILE *fin = NULL, *fout = NULL;
103  AVFrame *sw_frame = NULL, *hw_frame = NULL;
104  AVCodecContext *avctx = NULL;
105  const AVCodec *codec = NULL;
106  const char *enc_name = "h264_vaapi";
107 
108  if (argc < 5) {
109  fprintf(stderr, "Usage: %s <width> <height> <input file> <output file>\n", argv[0]);
110  return -1;
111  }
112 
113  width = atoi(argv[1]);
114  height = atoi(argv[2]);
115  size = width * height;
116 
117  if (!(fin = fopen(argv[3], "r"))) {
118  fprintf(stderr, "Fail to open input file : %s\n", strerror(errno));
119  return -1;
120  }
121  if (!(fout = fopen(argv[4], "w+b"))) {
122  fprintf(stderr, "Fail to open output file : %s\n", strerror(errno));
123  err = -1;
124  goto close;
125  }
126 
128  NULL, NULL, 0);
129  if (err < 0) {
130  fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(err));
131  goto close;
132  }
133 
134  if (!(codec = avcodec_find_encoder_by_name(enc_name))) {
135  fprintf(stderr, "Could not find encoder.\n");
136  err = -1;
137  goto close;
138  }
139 
140  if (!(avctx = avcodec_alloc_context3(codec))) {
141  err = AVERROR(ENOMEM);
142  goto close;
143  }
144 
145  avctx->width = width;
146  avctx->height = height;
147  avctx->time_base = (AVRational){1, 25};
148  avctx->framerate = (AVRational){25, 1};
149  avctx->sample_aspect_ratio = (AVRational){1, 1};
150  avctx->pix_fmt = AV_PIX_FMT_VAAPI;
151 
152  /* set hw_frames_ctx for encoder's AVCodecContext */
153  if ((err = set_hwframe_ctx(avctx, hw_device_ctx)) < 0) {
154  fprintf(stderr, "Failed to set hwframe context.\n");
155  goto close;
156  }
157 
158  if ((err = avcodec_open2(avctx, codec, NULL)) < 0) {
159  fprintf(stderr, "Cannot open video encoder codec. Error code: %s\n", av_err2str(err));
160  goto close;
161  }
162 
163  while (1) {
164  if (!(sw_frame = av_frame_alloc())) {
165  err = AVERROR(ENOMEM);
166  goto close;
167  }
168  /* read data into software frame, and transfer them into hw frame */
169  sw_frame->width = width;
170  sw_frame->height = height;
171  sw_frame->format = AV_PIX_FMT_NV12;
172  if ((err = av_frame_get_buffer(sw_frame, 0)) < 0)
173  goto close;
174  if ((err = fread((uint8_t*)(sw_frame->data[0]), size, 1, fin)) <= 0)
175  break;
176  if ((err = fread((uint8_t*)(sw_frame->data[1]), size/2, 1, fin)) <= 0)
177  break;
178 
179  if (!(hw_frame = av_frame_alloc())) {
180  err = AVERROR(ENOMEM);
181  goto close;
182  }
183  if ((err = av_hwframe_get_buffer(avctx->hw_frames_ctx, hw_frame, 0)) < 0) {
184  fprintf(stderr, "Error code: %s.\n", av_err2str(err));
185  goto close;
186  }
187  if (!hw_frame->hw_frames_ctx) {
188  err = AVERROR(ENOMEM);
189  goto close;
190  }
191  if ((err = av_hwframe_transfer_data(hw_frame, sw_frame, 0)) < 0) {
192  fprintf(stderr, "Error while transferring frame data to surface."
193  "Error code: %s.\n", av_err2str(err));
194  goto close;
195  }
196 
197  if ((err = (encode_write(avctx, hw_frame, fout))) < 0) {
198  fprintf(stderr, "Failed to encode.\n");
199  goto close;
200  }
201  av_frame_free(&hw_frame);
202  av_frame_free(&sw_frame);
203  }
204 
205  /* flush encoder */
206  err = encode_write(avctx, NULL, fout);
207  if (err == AVERROR_EOF)
208  err = 0;
209 
210 close:
211  if (fin)
212  fclose(fin);
213  if (fout)
214  fclose(fout);
215  av_frame_free(&sw_frame);
216  av_frame_free(&hw_frame);
217  avcodec_free_context(&avctx);
219 
220  return err;
221 }
Libavcodec external API header.
static AVFrame * frame
Definition: demux_decode.c:54
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
const AVCodec * avcodec_find_encoder_by_name(const char *name)
Find a registered encoder with the specified name.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
unsigned size
allocated memory
Definition: bprint.h:99
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
AVBufferRef * av_buffer_ref(const AVBufferRef *buf)
Create a new reference to an AVBuffer.
#define AVERROR_EOF
End of file.
Definition: error.h:57
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:121
#define AVERROR(e)
Definition: error.h:45
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
int av_hwframe_get_buffer(AVBufferRef *hwframe_ctx, AVFrame *frame, int flags)
Allocate a new frame attached to the given AVHWFramesContext.
AVBufferRef * av_hwframe_ctx_alloc(AVBufferRef *device_ctx)
Allocate an AVHWFramesContext tied to a given device context.
int av_hwframe_ctx_init(AVBufferRef *ref)
Finalize the context before use.
int av_hwframe_transfer_data(AVFrame *dst, const AVFrame *src, int flags)
Copy data to or from a hw surface.
int av_hwdevice_ctx_create(AVBufferRef **device_ctx, enum AVHWDeviceType type, const char *device, AVDictionary *opts, int flags)
Open a device of the specified type and create an AVHWDeviceContext for it.
@ AV_HWDEVICE_TYPE_VAAPI
Definition: hwcontext.h:31
@ AV_PIX_FMT_NV12
planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (firs...
Definition: pixfmt.h:89
@ AV_PIX_FMT_VAAPI
Hardware acceleration through VA-API, data[3] contains a VASurfaceID.
Definition: pixfmt.h:119
A reference to a data buffer.
Definition: buffer.h:82
uint8_t * data
The data buffer.
Definition: buffer.h:90
main external API structure.
Definition: avcodec.h:426
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:635
int width
picture width / height.
Definition: avcodec.h:598
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames.
Definition: avcodec.h:1887
AVRational framerate
Definition: avcodec.h:1750
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel.
Definition: avcodec.h:795
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avcodec.h:548
AVCodec.
Definition: codec.h:184
This structure describes decoded (raw) audio or video data.
Definition: frame.h:330
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:351
int width
Definition: frame.h:402
int height
Definition: frame.h:402
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:417
This struct describes a set or pool of "hardware" frames (i.e.
Definition: hwcontext.h:124
enum AVPixelFormat format
The pixel format identifying the underlying HW surface type.
Definition: hwcontext.h:209
enum AVPixelFormat sw_format
The pixel format identifying the actual data layout of the hardware frames.
Definition: hwcontext.h:222
int initial_pool_size
Initial size of the frame pool.
Definition: hwcontext.h:199
int width
The allocated dimensions of the frames in this pool.
Definition: hwcontext.h:229
This structure stores compressed data.
Definition: packet.h:351
int stream_index
Definition: packet.h:376
int size
Definition: packet.h:375
uint8_t * data
Definition: packet.h:374
Rational number (pair of numerator and denominator).
Definition: rational.h:58
static AVBufferRef * hw_device_ctx
Definition: vaapi_encode.c:39
int main(int argc, char *argv[])
Definition: vaapi_encode.c:99
static int width
Definition: vaapi_encode.c:38
static int encode_write(AVCodecContext *avctx, AVFrame *frame, FILE *fout)
Definition: vaapi_encode.c:71
static int set_hwframe_ctx(AVCodecContext *ctx, AVBufferRef *hw_device_ctx)
Definition: vaapi_encode.c:41
static int height
Definition: vaapi_encode.c:38