FFmpeg 7.1.1
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vaapi_transcode.c
Go to the documentation of this file.
1/*
2 * Permission is hereby granted, free of charge, to any person obtaining a copy
3 * of this software and associated documentation files (the "Software"), to deal
4 * in the Software without restriction, including without limitation the rights
5 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
6 * copies of the Software, and to permit persons to whom the Software is
7 * furnished to do so, subject to the following conditions:
8 *
9 * The above copyright notice and this permission notice shall be included in
10 * all copies or substantial portions of the Software.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
15 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
16 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 transcoding API usage example
23 * @example vaapi_transcode.c
24 *
25 * Perform VAAPI-accelerated transcoding.
26 * Usage: vaapi_transcode input_stream codec output_stream
27 * e.g: - vaapi_transcode input.mp4 h264_vaapi output_h264.mp4
28 * - vaapi_transcode input.mp4 vp9_vaapi output_vp9.ivf
29 */
30
31#include <stdio.h>
32#include <errno.h>
33
34#include <libavutil/hwcontext.h>
35#include <libavcodec/avcodec.h>
37
38static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
40static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL;
41static int video_stream = -1;
42static AVStream *ost;
43static int initialized = 0;
44
46 const enum AVPixelFormat *pix_fmts)
47{
48 const enum AVPixelFormat *p;
49
50 for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {
51 if (*p == AV_PIX_FMT_VAAPI)
52 return *p;
53 }
54
55 fprintf(stderr, "Unable to decode this file using VA-API.\n");
56 return AV_PIX_FMT_NONE;
57}
58
59static int open_input_file(const char *filename)
60{
61 int ret;
62 const AVCodec *decoder = NULL;
63 AVStream *video = NULL;
64
65 if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
66 fprintf(stderr, "Cannot open input file '%s', Error code: %s\n",
67 filename, av_err2str(ret));
68 return ret;
69 }
70
71 if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
72 fprintf(stderr, "Cannot find input stream information. Error code: %s\n",
73 av_err2str(ret));
74 return ret;
75 }
76
77 ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0);
78 if (ret < 0) {
79 fprintf(stderr, "Cannot find a video stream in the input file. "
80 "Error code: %s\n", av_err2str(ret));
81 return ret;
82 }
83 video_stream = ret;
84
85 if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
86 return AVERROR(ENOMEM);
87
89 if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) {
90 fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n",
91 av_err2str(ret));
92 return ret;
93 }
94
97 fprintf(stderr, "A hardware device reference create failed.\n");
98 return AVERROR(ENOMEM);
99 }
101
102 if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0)
103 fprintf(stderr, "Failed to open codec for decoding. Error code: %s\n",
104 av_err2str(ret));
105
106 return ret;
107}
108
109static int encode_write(AVPacket *enc_pkt, AVFrame *frame)
110{
111 int ret = 0;
112
113 av_packet_unref(enc_pkt);
114
115 if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {
116 fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret));
117 goto end;
118 }
119 while (1) {
120 ret = avcodec_receive_packet(encoder_ctx, enc_pkt);
121 if (ret)
122 break;
123
124 enc_pkt->stream_index = 0;
127 ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt);
128 if (ret < 0) {
129 fprintf(stderr, "Error during writing data to output file. "
130 "Error code: %s\n", av_err2str(ret));
131 return -1;
132 }
133 }
134
135end:
136 if (ret == AVERROR_EOF)
137 return 0;
138 ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);
139 return ret;
140}
141
142static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec)
143{
144 AVFrame *frame;
145 int ret = 0;
146
148 if (ret < 0) {
149 fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret));
150 return ret;
151 }
152
153 while (ret >= 0) {
154 if (!(frame = av_frame_alloc()))
155 return AVERROR(ENOMEM);
156
158 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
160 return 0;
161 } else if (ret < 0) {
162 fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret));
163 goto fail;
164 }
165
166 if (!initialized) {
167 /* we need to ref hw_frames_ctx of decoder to initialize encoder's codec.
168 Only after we get a decoded frame, can we obtain its hw_frames_ctx */
171 ret = AVERROR(ENOMEM);
172 goto fail;
173 }
174 /* set AVCodecContext Parameters for encoder, here we keep them stay
175 * the same as decoder.
176 * xxx: now the sample can't handle resolution change case.
177 */
182
183 if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) {
184 fprintf(stderr, "Failed to open encode codec. Error code: %s\n",
185 av_err2str(ret));
186 goto fail;
187 }
188
189 if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {
190 fprintf(stderr, "Failed to allocate stream for output format.\n");
191 ret = AVERROR(ENOMEM);
192 goto fail;
193 }
194
197 if (ret < 0) {
198 fprintf(stderr, "Failed to copy the stream parameters. "
199 "Error code: %s\n", av_err2str(ret));
200 goto fail;
201 }
202
203 /* write the stream header */
204 if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
205 fprintf(stderr, "Error while writing stream header. "
206 "Error code: %s\n", av_err2str(ret));
207 goto fail;
208 }
209
210 initialized = 1;
211 }
212
213 if ((ret = encode_write(pkt, frame)) < 0)
214 fprintf(stderr, "Error during encoding and writing.\n");
215
216fail:
218 }
219 return ret;
220}
221
222int main(int argc, char **argv)
223{
224 const AVCodec *enc_codec;
225 int ret = 0;
226 AVPacket *dec_pkt;
227
228 if (argc != 4) {
229 fprintf(stderr, "Usage: %s <input file> <encode codec> <output file>\n"
230 "The output format is guessed according to the file extension.\n"
231 "\n", argv[0]);
232 return -1;
233 }
234
236 if (ret < 0) {
237 fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(ret));
238 return -1;
239 }
240
241 dec_pkt = av_packet_alloc();
242 if (!dec_pkt) {
243 fprintf(stderr, "Failed to allocate decode packet\n");
244 goto end;
245 }
246
247 if ((ret = open_input_file(argv[1])) < 0)
248 goto end;
249
250 if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
251 fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
252 ret = -1;
253 goto end;
254 }
255
256 if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {
257 fprintf(stderr, "Failed to deduce output format from file extension. Error code: "
258 "%s\n", av_err2str(ret));
259 goto end;
260 }
261
262 if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
263 ret = AVERROR(ENOMEM);
264 goto end;
265 }
266
267 ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
268 if (ret < 0) {
269 fprintf(stderr, "Cannot open output file. "
270 "Error code: %s\n", av_err2str(ret));
271 goto end;
272 }
273
274 /* read all packets and only transcoding video */
275 while (ret >= 0) {
276 if ((ret = av_read_frame(ifmt_ctx, dec_pkt)) < 0)
277 break;
278
279 if (video_stream == dec_pkt->stream_index)
280 ret = dec_enc(dec_pkt, enc_codec);
281
282 av_packet_unref(dec_pkt);
283 }
284
285 /* flush decoder */
286 av_packet_unref(dec_pkt);
287 ret = dec_enc(dec_pkt, enc_codec);
288
289 /* flush encoder */
290 ret = encode_write(dec_pkt, NULL);
291
292 /* write the trailer for output stream */
294
295end:
301 av_packet_free(&dec_pkt);
302 return ret;
303}
Libavcodec external API header.
Main libavformat public API header.
int avformat_alloc_output_context2(AVFormatContext **ctx, const AVOutputFormat *oformat, const char *format_name, const char *filename)
Allocate an AVFormatContext for an output format.
int avio_open(AVIOContext **s, const char *url, int flags)
Create and initialize a AVIOContext for accessing the resource indicated by url.
#define AVIO_FLAG_WRITE
write-only
Definition avio.h:618
int main(int argc, char *argv[])
static int open_input_file(const char *filename)
static AVPacket * pkt
static AVStream * video_stream
static AVFrame * frame
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
int avcodec_parameters_from_context(struct AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
int avcodec_parameters_to_context(AVCodecContext *codec, const struct AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
const AVCodec * avcodec_find_encoder_by_name(const char *name)
Find a registered encoder with the specified name.
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_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder or encoder (when the AV_CODEC_FLAG_RECON_FRAME flag is used...
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
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.
void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst)
Convert valid timing fields (timestamps / durations) in a packet from one timebase to another.
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, const struct AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
av_warn_unused_result int avformat_write_header(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and write the stream header to an output media file.
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file ensuring correct interleaving.
int av_write_trailer(AVFormatContext *s)
Write the stream trailer to an output media file and free the file private data.
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:122
#define AVERROR(e)
Definition error.h:45
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.
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition rational.h:159
@ AVMEDIA_TYPE_VIDEO
Definition avutil.h:201
static AVBufferRef * hw_device_ctx
Definition hw_decode.c:45
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
AVPixelFormat
Pixel format.
Definition pixfmt.h:71
@ AV_PIX_FMT_NONE
Definition pixfmt.h:72
@ AV_PIX_FMT_VAAPI
Hardware acceleration through VA-API, data[3] contains a VASurfaceID.
Definition pixfmt.h:126
A reference to a data buffer.
Definition buffer.h:82
main external API structure.
Definition avcodec.h:451
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition avcodec.h:663
int width
picture width / height.
Definition avcodec.h:624
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Callback to negotiate the pixel format.
Definition avcodec.h:793
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames.
Definition avcodec.h:1485
AVRational framerate
Definition avcodec.h:566
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition avcodec.h:550
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition avcodec.h:1507
AVCodec.
Definition codec.h:187
Format I/O context.
Definition avformat.h:1287
AVIOContext * pb
I/O context.
Definition avformat.h:1329
AVStream ** streams
A list of all streams in the file.
Definition avformat.h:1355
This structure describes decoded (raw) audio or video data.
Definition frame.h:389
This structure stores compressed data.
Definition packet.h:516
int stream_index
Definition packet.h:541
Stream structure.
Definition avformat.h:748
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition avformat.h:771
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition avformat.h:787
static AVFormatContext * ifmt_ctx
Definition transcode.c:42
static AVFormatContext * ofmt_ctx
Definition transcode.c:43
static int encode_write(AVCodecContext *avctx, AVFrame *frame, FILE *fout)
static enum AVPixelFormat get_vaapi_format(AVCodecContext *ctx, const enum AVPixelFormat *pix_fmts)
static AVStream * ost
static AVCodecContext * encoder_ctx
static AVCodecContext * decoder_ctx
static int initialized
static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec)