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22 * @file Intel QSV-accelerated video transcoding API usage example
23 * @example qsv_transcode.c
25 * Perform QSV-accelerated transcoding and show to dynamically change
28 * Usage: qsv_transcode input_stream codec output_stream initial option
29 * { frame_number new_option }
30 * e.g: - qsv_transcode input.mp4 h264_qsv output_h264.mp4 "g 60"
31 * - qsv_transcode input.mp4 hevc_qsv output_hevc.mp4 "g 60 async_depth 1"
33 * (initialize codec with gop_size 60 and change it to 120 after 100
40 #include <libavutil/hwcontext.h>
41 #include <libavcodec/avcodec.h>
42 #include <libavformat/avformat.h>
43 #include <libavutil/opt.h>
45 static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
46 static AVBufferRef *hw_device_ctx = NULL;
47 static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL;
48 static int video_stream = -1;
50 typedef struct DynamicSetting {
54 static DynamicSetting *dynamic_setting;
55 static int setting_number;
56 static int current_setting_number;
58 static int str_to_dict(char* optstr, AVDictionary **opt)
61 if (strlen(optstr) == 0)
63 key = strtok(optstr, " ");
65 return AVERROR(ENAVAIL);
66 value = strtok(NULL, " ");
68 return AVERROR(ENAVAIL);
69 av_dict_set(opt, key, value, 0);
71 key = strtok(NULL, " ");
74 value = strtok(NULL, " ");
76 return AVERROR(ENAVAIL);
77 av_dict_set(opt, key, value, 0);
82 static int dynamic_set_parameter(AVCodecContext *avctx)
84 AVDictionary *opts = NULL;
86 static int frame_number = 0;
88 if (current_setting_number < setting_number &&
89 frame_number == dynamic_setting[current_setting_number].frame_number) {
90 AVDictionaryEntry *e = NULL;
91 ret = str_to_dict(dynamic_setting[current_setting_number++].optstr, &opts);
93 fprintf(stderr, "The dynamic parameter is wrong\n");
96 /* Set common option. The dictionary will be freed and replaced
97 * by a new one containing all options not found in common option list.
98 * Then this new dictionary is used to set private option. */
99 if ((ret = av_opt_set_dict(avctx, &opts)) < 0)
101 /* Set codec specific option */
102 if ((ret = av_opt_set_dict(avctx->priv_data, &opts)) < 0)
104 /* There is no "framerate" option in commom option list. Use "-r" to set
105 * framerate, which is compatible with ffmpeg commandline. The video is
106 * assumed to be average frame rate, so set time_base to 1/framerate. */
107 e = av_dict_get(opts, "r", NULL, 0);
109 avctx->framerate = av_d2q(atof(e->value), INT_MAX);
110 encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);
118 static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
120 while (*pix_fmts != AV_PIX_FMT_NONE) {
121 if (*pix_fmts == AV_PIX_FMT_QSV) {
122 return AV_PIX_FMT_QSV;
128 fprintf(stderr, "The QSV pixel format not offered in get_format()\n");
130 return AV_PIX_FMT_NONE;
133 static int open_input_file(char *filename)
136 const AVCodec *decoder = NULL;
137 AVStream *video = NULL;
139 if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
140 fprintf(stderr, "Cannot open input file '%s', Error code: %s\n",
141 filename, av_err2str(ret));
145 if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
146 fprintf(stderr, "Cannot find input stream information. Error code: %s\n",
151 ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
153 fprintf(stderr, "Cannot find a video stream in the input file. "
154 "Error code: %s\n", av_err2str(ret));
158 video = ifmt_ctx->streams[video_stream];
160 switch(video->codecpar->codec_id) {
161 case AV_CODEC_ID_H264:
162 decoder = avcodec_find_decoder_by_name("h264_qsv");
164 case AV_CODEC_ID_HEVC:
165 decoder = avcodec_find_decoder_by_name("hevc_qsv");
167 case AV_CODEC_ID_VP9:
168 decoder = avcodec_find_decoder_by_name("vp9_qsv");
170 case AV_CODEC_ID_VP8:
171 decoder = avcodec_find_decoder_by_name("vp8_qsv");
173 case AV_CODEC_ID_AV1:
174 decoder = avcodec_find_decoder_by_name("av1_qsv");
176 case AV_CODEC_ID_MPEG2VIDEO:
177 decoder = avcodec_find_decoder_by_name("mpeg2_qsv");
179 case AV_CODEC_ID_MJPEG:
180 decoder = avcodec_find_decoder_by_name("mjpeg_qsv");
183 fprintf(stderr, "Codec is not supportted by qsv\n");
184 return AVERROR(ENAVAIL);
187 if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
188 return AVERROR(ENOMEM);
190 if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) {
191 fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n",
195 decoder_ctx->framerate = av_guess_frame_rate(ifmt_ctx, video, NULL);
197 decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);
198 if (!decoder_ctx->hw_device_ctx) {
199 fprintf(stderr, "A hardware device reference create failed.\n");
200 return AVERROR(ENOMEM);
202 decoder_ctx->get_format = get_format;
203 decoder_ctx->pkt_timebase = video->time_base;
204 if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0)
205 fprintf(stderr, "Failed to open codec for decoding. Error code: %s\n",
211 static int encode_write(AVPacket *enc_pkt, AVFrame *frame)
215 av_packet_unref(enc_pkt);
217 if((ret = dynamic_set_parameter(encoder_ctx)) < 0) {
218 fprintf(stderr, "Failed to set dynamic parameter. Error code: %s\n",
223 if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {
224 fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret));
228 if (ret = avcodec_receive_packet(encoder_ctx, enc_pkt))
230 enc_pkt->stream_index = 0;
231 av_packet_rescale_ts(enc_pkt, encoder_ctx->time_base,
232 ofmt_ctx->streams[0]->time_base);
233 if ((ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt)) < 0) {
234 fprintf(stderr, "Error during writing data to output file. "
235 "Error code: %s\n", av_err2str(ret));
241 if (ret == AVERROR_EOF)
243 ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);
247 static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr)
252 ret = avcodec_send_packet(decoder_ctx, pkt);
254 fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret));
259 if (!(frame = av_frame_alloc()))
260 return AVERROR(ENOMEM);
262 ret = avcodec_receive_frame(decoder_ctx, frame);
263 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
264 av_frame_free(&frame);
266 } else if (ret < 0) {
267 fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret));
270 if (!encoder_ctx->hw_frames_ctx) {
271 AVDictionaryEntry *e = NULL;
272 AVDictionary *opts = NULL;
274 /* we need to ref hw_frames_ctx of decoder to initialize encoder's codec.
275 Only after we get a decoded frame, can we obtain its hw_frames_ctx */
276 encoder_ctx->hw_frames_ctx = av_buffer_ref(decoder_ctx->hw_frames_ctx);
277 if (!encoder_ctx->hw_frames_ctx) {
278 ret = AVERROR(ENOMEM);
281 /* set AVCodecContext Parameters for encoder, here we keep them stay
282 * the same as decoder.
284 encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate);
285 encoder_ctx->pix_fmt = AV_PIX_FMT_QSV;
286 encoder_ctx->width = decoder_ctx->width;
287 encoder_ctx->height = decoder_ctx->height;
288 if ((ret = str_to_dict(optstr, &opts)) < 0) {
289 fprintf(stderr, "Failed to set encoding parameter.\n");
292 /* There is no "framerate" option in commom option list. Use "-r" to
293 * set framerate, which is compatible with ffmpeg commandline. The
294 * video is assumed to be average frame rate, so set time_base to
296 e = av_dict_get(opts, "r", NULL, 0);
298 encoder_ctx->framerate = av_d2q(atof(e->value), INT_MAX);
299 encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);
301 if ((ret = avcodec_open2(encoder_ctx, enc_codec, &opts)) < 0) {
302 fprintf(stderr, "Failed to open encode codec. Error code: %s\n",
309 if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {
310 fprintf(stderr, "Failed to allocate stream for output format.\n");
311 ret = AVERROR(ENOMEM);
315 ost->time_base = encoder_ctx->time_base;
316 ret = avcodec_parameters_from_context(ost->codecpar, encoder_ctx);
318 fprintf(stderr, "Failed to copy the stream parameters. "
319 "Error code: %s\n", av_err2str(ret));
323 /* write the stream header */
324 if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
325 fprintf(stderr, "Error while writing stream header. "
326 "Error code: %s\n", av_err2str(ret));
330 frame->pts = av_rescale_q(frame->pts, decoder_ctx->pkt_timebase,
331 encoder_ctx->time_base);
332 if ((ret = encode_write(pkt, frame)) < 0)
333 fprintf(stderr, "Error during encoding and writing.\n");
336 av_frame_free(&frame);
343 int main(int argc, char **argv)
345 const AVCodec *enc_codec;
349 if (argc < 5 || (argc - 5) % 2) {
350 av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <encoder> <output file>"
351 " <\"encoding option set 0\"> [<frame_number> <\"encoding options set 1\">]...\n", argv[0]);
354 setting_number = (argc - 5) / 2;
355 dynamic_setting = av_malloc(setting_number * sizeof(*dynamic_setting));
356 current_setting_number = 0;
357 for (int i = 0; i < setting_number; i++) {
358 dynamic_setting[i].frame_number = atoi(argv[i*2 + 5]);
359 dynamic_setting[i].optstr = argv[i*2 + 6];
362 ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_QSV, NULL, NULL, 0);
364 fprintf(stderr, "Failed to create a QSV device. Error code: %s\n", av_err2str(ret));
368 dec_pkt = av_packet_alloc();
370 fprintf(stderr, "Failed to allocate decode packet\n");
374 if ((ret = open_input_file(argv[1])) < 0)
377 if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
378 fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
383 if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {
384 fprintf(stderr, "Failed to deduce output format from file extension. Error code: "
385 "%s\n", av_err2str(ret));
389 if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
390 ret = AVERROR(ENOMEM);
394 ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
396 fprintf(stderr, "Cannot open output file. "
397 "Error code: %s\n", av_err2str(ret));
401 /* read all packets and only transcoding video */
403 if ((ret = av_read_frame(ifmt_ctx, dec_pkt)) < 0)
406 if (video_stream == dec_pkt->stream_index)
407 ret = dec_enc(dec_pkt, enc_codec, argv[4]);
409 av_packet_unref(dec_pkt);
413 av_packet_unref(dec_pkt);
414 if ((ret = dec_enc(dec_pkt, enc_codec, argv[4])) < 0) {
415 fprintf(stderr, "Failed to flush decoder %s\n", av_err2str(ret));
420 if ((ret = encode_write(dec_pkt, NULL)) < 0) {
421 fprintf(stderr, "Failed to flush encoder %s\n", av_err2str(ret));
425 /* write the trailer for output stream */
426 if ((ret = av_write_trailer(ofmt_ctx)) < 0)
427 fprintf(stderr, "Failed to write trailer %s\n", av_err2str(ret));
430 avformat_close_input(&ifmt_ctx);
431 avformat_close_input(&ofmt_ctx);
432 avcodec_free_context(&decoder_ctx);
433 avcodec_free_context(&encoder_ctx);
434 av_buffer_unref(&hw_device_ctx);
435 av_packet_free(&dec_pkt);
436 av_freep(&dynamic_setting);