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 const 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(AVPacket * enc_pkt,AVFrame * frame)112 static int encode_write(AVPacket *enc_pkt, AVFrame *frame)
113 {
114 int ret = 0;
115
116 av_packet_unref(enc_pkt);
117
118 if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {
119 fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret));
120 goto end;
121 }
122 while (1) {
123 ret = avcodec_receive_packet(encoder_ctx, enc_pkt);
124 if (ret)
125 break;
126
127 enc_pkt->stream_index = 0;
128 av_packet_rescale_ts(enc_pkt, ifmt_ctx->streams[video_stream]->time_base,
129 ofmt_ctx->streams[0]->time_base);
130 ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt);
131 if (ret < 0) {
132 fprintf(stderr, "Error during writing data to output file. "
133 "Error code: %s\n", av_err2str(ret));
134 return -1;
135 }
136 }
137
138 end:
139 if (ret == AVERROR_EOF)
140 return 0;
141 ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);
142 return ret;
143 }
144
dec_enc(AVPacket * pkt,const AVCodec * enc_codec)145 static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec)
146 {
147 AVFrame *frame;
148 int ret = 0;
149
150 ret = avcodec_send_packet(decoder_ctx, pkt);
151 if (ret < 0) {
152 fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret));
153 return ret;
154 }
155
156 while (ret >= 0) {
157 if (!(frame = av_frame_alloc()))
158 return AVERROR(ENOMEM);
159
160 ret = avcodec_receive_frame(decoder_ctx, frame);
161 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
162 av_frame_free(&frame);
163 return 0;
164 } else if (ret < 0) {
165 fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret));
166 goto fail;
167 }
168
169 if (!initialized) {
170 /* we need to ref hw_frames_ctx of decoder to initialize encoder's codec.
171 Only after we get a decoded frame, can we obtain its hw_frames_ctx */
172 encoder_ctx->hw_frames_ctx = av_buffer_ref(decoder_ctx->hw_frames_ctx);
173 if (!encoder_ctx->hw_frames_ctx) {
174 ret = AVERROR(ENOMEM);
175 goto fail;
176 }
177 /* set AVCodecContext Parameters for encoder, here we keep them stay
178 * the same as decoder.
179 * xxx: now the sample can't handle resolution change case.
180 */
181 encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate);
182 encoder_ctx->pix_fmt = AV_PIX_FMT_VAAPI;
183 encoder_ctx->width = decoder_ctx->width;
184 encoder_ctx->height = decoder_ctx->height;
185
186 if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) {
187 fprintf(stderr, "Failed to open encode codec. Error code: %s\n",
188 av_err2str(ret));
189 goto fail;
190 }
191
192 if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {
193 fprintf(stderr, "Failed to allocate stream for output format.\n");
194 ret = AVERROR(ENOMEM);
195 goto fail;
196 }
197
198 ost->time_base = encoder_ctx->time_base;
199 ret = avcodec_parameters_from_context(ost->codecpar, encoder_ctx);
200 if (ret < 0) {
201 fprintf(stderr, "Failed to copy the stream parameters. "
202 "Error code: %s\n", av_err2str(ret));
203 goto fail;
204 }
205
206 /* write the stream header */
207 if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
208 fprintf(stderr, "Error while writing stream header. "
209 "Error code: %s\n", av_err2str(ret));
210 goto fail;
211 }
212
213 initialized = 1;
214 }
215
216 if ((ret = encode_write(pkt, frame)) < 0)
217 fprintf(stderr, "Error during encoding and writing.\n");
218
219 fail:
220 av_frame_free(&frame);
221 if (ret < 0)
222 return ret;
223 }
224 return 0;
225 }
226
main(int argc,char ** argv)227 int main(int argc, char **argv)
228 {
229 const AVCodec *enc_codec;
230 int ret = 0;
231 AVPacket *dec_pkt;
232
233 if (argc != 4) {
234 fprintf(stderr, "Usage: %s <input file> <encode codec> <output file>\n"
235 "The output format is guessed according to the file extension.\n"
236 "\n", argv[0]);
237 return -1;
238 }
239
240 ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI, NULL, NULL, 0);
241 if (ret < 0) {
242 fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(ret));
243 return -1;
244 }
245
246 dec_pkt = av_packet_alloc();
247 if (!dec_pkt) {
248 fprintf(stderr, "Failed to allocate decode packet\n");
249 goto end;
250 }
251
252 if ((ret = open_input_file(argv[1])) < 0)
253 goto end;
254
255 if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
256 fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
257 ret = -1;
258 goto end;
259 }
260
261 if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {
262 fprintf(stderr, "Failed to deduce output format from file extension. Error code: "
263 "%s\n", av_err2str(ret));
264 goto end;
265 }
266
267 if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
268 ret = AVERROR(ENOMEM);
269 goto end;
270 }
271
272 ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
273 if (ret < 0) {
274 fprintf(stderr, "Cannot open output file. "
275 "Error code: %s\n", av_err2str(ret));
276 goto end;
277 }
278
279 /* read all packets and only transcoding video */
280 while (ret >= 0) {
281 if ((ret = av_read_frame(ifmt_ctx, dec_pkt)) < 0)
282 break;
283
284 if (video_stream == dec_pkt->stream_index)
285 ret = dec_enc(dec_pkt, enc_codec);
286
287 av_packet_unref(dec_pkt);
288 }
289
290 /* flush decoder */
291 av_packet_unref(dec_pkt);
292 ret = dec_enc(dec_pkt, enc_codec);
293
294 /* flush encoder */
295 ret = encode_write(dec_pkt, NULL);
296
297 /* write the trailer for output stream */
298 av_write_trailer(ofmt_ctx);
299
300 end:
301 avformat_close_input(&ifmt_ctx);
302 avformat_close_input(&ofmt_ctx);
303 avcodec_free_context(&decoder_ctx);
304 avcodec_free_context(&encoder_ctx);
305 av_buffer_unref(&hw_device_ctx);
306 av_packet_free(&dec_pkt);
307 return ret;
308 }
309