1 /*
2 * Video Acceleration API (video transcoding) transcode sample
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20 * THE SOFTWARE.
21 */
22
23 /**
24 * @file
25 * Intel VAAPI-accelerated transcoding example.
26 *
27 * @example vaapi_transcode.c
28 * This example shows how to do VAAPI-accelerated transcoding.
29 * Usage: vaapi_transcode input_stream codec output_stream
30 * e.g: - vaapi_transcode input.mp4 h264_vaapi output_h264.mp4
31 * - vaapi_transcode input.mp4 vp9_vaapi output_vp9.ivf
32 */
33
34 #include <stdio.h>
35 #include <errno.h>
36
37 #include <libavutil/hwcontext.h>
38 #include <libavcodec/avcodec.h>
39 #include <libavformat/avformat.h>
40
41 static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
42 static AVBufferRef *hw_device_ctx = NULL;
43 static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL;
44 static int video_stream = -1;
45 static AVStream *ost;
46 static int initialized = 0;
47
get_vaapi_format(AVCodecContext * ctx,const enum AVPixelFormat * pix_fmts)48 static enum AVPixelFormat get_vaapi_format(AVCodecContext *ctx,
49 const enum AVPixelFormat *pix_fmts)
50 {
51 const enum AVPixelFormat *p;
52
53 for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {
54 if (*p == AV_PIX_FMT_VAAPI)
55 return *p;
56 }
57
58 fprintf(stderr, "Unable to decode this file using VA-API.\n");
59 return AV_PIX_FMT_NONE;
60 }
61
open_input_file(const char * filename)62 static int open_input_file(const char *filename)
63 {
64 int ret;
65 AVCodec *decoder = NULL;
66 AVStream *video = NULL;
67
68 if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
69 fprintf(stderr, "Cannot open input file '%s', Error code: %s\n",
70 filename, av_err2str(ret));
71 return ret;
72 }
73
74 if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
75 fprintf(stderr, "Cannot find input stream information. Error code: %s\n",
76 av_err2str(ret));
77 return ret;
78 }
79
80 ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0);
81 if (ret < 0) {
82 fprintf(stderr, "Cannot find a video stream in the input file. "
83 "Error code: %s\n", av_err2str(ret));
84 return ret;
85 }
86 video_stream = ret;
87
88 if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
89 return AVERROR(ENOMEM);
90
91 video = ifmt_ctx->streams[video_stream];
92 if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) {
93 fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n",
94 av_err2str(ret));
95 return ret;
96 }
97
98 decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);
99 if (!decoder_ctx->hw_device_ctx) {
100 fprintf(stderr, "A hardware device reference create failed.\n");
101 return AVERROR(ENOMEM);
102 }
103 decoder_ctx->get_format = get_vaapi_format;
104
105 if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0)
106 fprintf(stderr, "Failed to open codec for decoding. Error code: %s\n",
107 av_err2str(ret));
108
109 return ret;
110 }
111
encode_write(AVFrame * frame)112 static int encode_write(AVFrame *frame)
113 {
114 int ret = 0;
115 AVPacket enc_pkt;
116
117 av_init_packet(&enc_pkt);
118 enc_pkt.data = NULL;
119 enc_pkt.size = 0;
120
121 if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {
122 fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret));
123 goto end;
124 }
125 while (1) {
126 ret = avcodec_receive_packet(encoder_ctx, &enc_pkt);
127 if (ret)
128 break;
129
130 enc_pkt.stream_index = 0;
131 av_packet_rescale_ts(&enc_pkt, ifmt_ctx->streams[video_stream]->time_base,
132 ofmt_ctx->streams[0]->time_base);
133 ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);
134 if (ret < 0) {
135 fprintf(stderr, "Error during writing data to output file. "
136 "Error code: %s\n", av_err2str(ret));
137 return -1;
138 }
139 }
140
141 end:
142 if (ret == AVERROR_EOF)
143 return 0;
144 ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);
145 return ret;
146 }
147
dec_enc(AVPacket * pkt,AVCodec * enc_codec)148 static int dec_enc(AVPacket *pkt, AVCodec *enc_codec)
149 {
150 AVFrame *frame;
151 int ret = 0;
152
153 ret = avcodec_send_packet(decoder_ctx, pkt);
154 if (ret < 0) {
155 fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret));
156 return ret;
157 }
158
159 while (ret >= 0) {
160 if (!(frame = av_frame_alloc()))
161 return AVERROR(ENOMEM);
162
163 ret = avcodec_receive_frame(decoder_ctx, frame);
164 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
165 av_frame_free(&frame);
166 return 0;
167 } else if (ret < 0) {
168 fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret));
169 goto fail;
170 }
171
172 if (!initialized) {
173 /* we need to ref hw_frames_ctx of decoder to initialize encoder's codec.
174 Only after we get a decoded frame, can we obtain its hw_frames_ctx */
175 encoder_ctx->hw_frames_ctx = av_buffer_ref(decoder_ctx->hw_frames_ctx);
176 if (!encoder_ctx->hw_frames_ctx) {
177 ret = AVERROR(ENOMEM);
178 goto fail;
179 }
180 /* set AVCodecContext Parameters for encoder, here we keep them stay
181 * the same as decoder.
182 * xxx: now the sample can't handle resolution change case.
183 */
184 encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate);
185 encoder_ctx->pix_fmt = AV_PIX_FMT_VAAPI;
186 encoder_ctx->width = decoder_ctx->width;
187 encoder_ctx->height = decoder_ctx->height;
188
189 if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) {
190 fprintf(stderr, "Failed to open encode codec. Error code: %s\n",
191 av_err2str(ret));
192 goto fail;
193 }
194
195 if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {
196 fprintf(stderr, "Failed to allocate stream for output format.\n");
197 ret = AVERROR(ENOMEM);
198 goto fail;
199 }
200
201 ost->time_base = encoder_ctx->time_base;
202 ret = avcodec_parameters_from_context(ost->codecpar, encoder_ctx);
203 if (ret < 0) {
204 fprintf(stderr, "Failed to copy the stream parameters. "
205 "Error code: %s\n", av_err2str(ret));
206 goto fail;
207 }
208
209 /* write the stream header */
210 if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
211 fprintf(stderr, "Error while writing stream header. "
212 "Error code: %s\n", av_err2str(ret));
213 goto fail;
214 }
215
216 initialized = 1;
217 }
218
219 if ((ret = encode_write(frame)) < 0)
220 fprintf(stderr, "Error during encoding and writing.\n");
221
222 fail:
223 av_frame_free(&frame);
224 if (ret < 0)
225 return ret;
226 }
227 return 0;
228 }
229
main(int argc,char ** argv)230 int main(int argc, char **argv)
231 {
232 int ret = 0;
233 AVPacket dec_pkt;
234 AVCodec *enc_codec;
235
236 if (argc != 4) {
237 fprintf(stderr, "Usage: %s <input file> <encode codec> <output file>\n"
238 "The output format is guessed according to the file extension.\n"
239 "\n", argv[0]);
240 return -1;
241 }
242
243 ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI, NULL, NULL, 0);
244 if (ret < 0) {
245 fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(ret));
246 return -1;
247 }
248
249 if ((ret = open_input_file(argv[1])) < 0)
250 goto end;
251
252 if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
253 fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
254 ret = -1;
255 goto end;
256 }
257
258 if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {
259 fprintf(stderr, "Failed to deduce output format from file extension. Error code: "
260 "%s\n", av_err2str(ret));
261 goto end;
262 }
263
264 if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
265 ret = AVERROR(ENOMEM);
266 goto end;
267 }
268
269 ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
270 if (ret < 0) {
271 fprintf(stderr, "Cannot open output file. "
272 "Error code: %s\n", av_err2str(ret));
273 goto end;
274 }
275
276 /* read all packets and only transcoding video */
277 while (ret >= 0) {
278 if ((ret = av_read_frame(ifmt_ctx, &dec_pkt)) < 0)
279 break;
280
281 if (video_stream == dec_pkt.stream_index)
282 ret = dec_enc(&dec_pkt, enc_codec);
283
284 av_packet_unref(&dec_pkt);
285 }
286
287 /* flush decoder */
288 dec_pkt.data = NULL;
289 dec_pkt.size = 0;
290 ret = dec_enc(&dec_pkt, enc_codec);
291 av_packet_unref(&dec_pkt);
292
293 /* flush encoder */
294 ret = encode_write(NULL);
295
296 /* write the trailer for output stream */
297 av_write_trailer(ofmt_ctx);
298
299 end:
300 avformat_close_input(&ifmt_ctx);
301 avformat_close_input(&ofmt_ctx);
302 avcodec_free_context(&decoder_ctx);
303 avcodec_free_context(&encoder_ctx);
304 av_buffer_unref(&hw_device_ctx);
305 return ret;
306 }
307