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qsv_transcode.c

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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 */

21 /**

22 * @file Intel QSV-accelerated video transcoding API usage example

23 * @example qsv_transcode.c

24 *

25 * Perform QSV-accelerated transcoding and show to dynamically change

26 * encoder's options.

27 *

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"

32 * 100 "g 120"

33 * (initialize codec with gop_size 60 and change it to 120 after 100

34 * frames)

35 */

37 #include <stdio.h>

38 #include <errno.h>

40 #include <libavutil/hwcontext.h>

41 #include <libavutil/mem.h>

42 #include <libavcodec/avcodec.h>

43 #include <libavformat/avformat.h>

44 #include <libavutil/opt.h>

46 static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;

47 static AVBufferRef *hw_device_ctx = NULL;

48 static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL;

49 static int video_stream = -1;

51 typedef struct DynamicSetting {

52 int frame_number;

53 char* optstr;

54 } DynamicSetting;

55 static DynamicSetting *dynamic_setting;

56 static int setting_number;

57 static int current_setting_number;

59 static int str_to_dict(char* optstr, AVDictionary **opt)

60 {

61 char *key, *value;

62 if (strlen(optstr) == 0)

63 return 0;

64 key = strtok(optstr, " ");

65 if (key == NULL)

66 return AVERROR(EINVAL);

67 value = strtok(NULL, " ");

68 if (value == NULL)

69 return AVERROR(EINVAL);

70 av_dict_set(opt, key, value, 0);

71 do {

72 key = strtok(NULL, " ");

73 if (key == NULL)

74 return 0;

75 value = strtok(NULL, " ");

76 if (value == NULL)

77 return AVERROR(EINVAL);

78 av_dict_set(opt, key, value, 0);

79 } while(1);

80 }

82 static int dynamic_set_parameter(AVCodecContext *avctx)

83 {

84 AVDictionary *opts = NULL;

85 int ret = 0;

86 static int frame_number = 0;

87 frame_number++;

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);

92 if (ret < 0) {

93 fprintf(stderr, "The dynamic parameter is wrong\n");

94 goto fail;

95 }

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)

100 goto fail;

101 /* Set codec specific option */

102 if ((ret = av_opt_set_dict(avctx->priv_data, &opts)) < 0)

103 goto fail;

104 /* There is no "framerate" option in common 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);

108 if (e) {

109 avctx->framerate = av_d2q(atof(e->value), INT_MAX);

110 encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);

111 }

112 }

113 fail:

114 av_dict_free(&opts);

115 return ret;

116 }

117

118 static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)

119 {

120 while (*pix_fmts != AV_PIX_FMT_NONE) {

121 if (*pix_fmts == AV_PIX_FMT_QSV) {

122 return AV_PIX_FMT_QSV;

123 }

124

125 pix_fmts++;

126 }

127

128 fprintf(stderr, "The QSV pixel format not offered in get_format()\n");

129

130 return AV_PIX_FMT_NONE;

131 }

132

133 static int open_input_file(char *filename)

134 {

135 int ret;

136 const AVCodec *decoder = NULL;

137 AVStream *video = NULL;

138

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));

142 return ret;

143 }

144

145 if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {

146 fprintf(stderr, "Cannot find input stream information. Error code: %s\n",

147 av_err2str(ret));

148 return ret;

149 }

150

151 ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);

152 if (ret < 0) {

153 fprintf(stderr, "Cannot find a video stream in the input file. "

154 "Error code: %s\n", av_err2str(ret));

155 return ret;

156 }

157 video_stream = ret;

158 video = ifmt_ctx->streams[video_stream];

159

160 switch(video->codecpar->codec_id) {

161 case AV_CODEC_ID_H264:

162 decoder = avcodec_find_decoder_by_name("h264_qsv");

163 break;

164 case AV_CODEC_ID_HEVC:

165 decoder = avcodec_find_decoder_by_name("hevc_qsv");

166 break;

167 case AV_CODEC_ID_VP9:

168 decoder = avcodec_find_decoder_by_name("vp9_qsv");

169 break;

170 case AV_CODEC_ID_VP8:

171 decoder = avcodec_find_decoder_by_name("vp8_qsv");

172 break;

173 case AV_CODEC_ID_AV1:

174 decoder = avcodec_find_decoder_by_name("av1_qsv");

175 break;

176 case AV_CODEC_ID_MPEG2VIDEO:

177 decoder = avcodec_find_decoder_by_name("mpeg2_qsv");

178 break;

179 case AV_CODEC_ID_MJPEG:

180 decoder = avcodec_find_decoder_by_name("mjpeg_qsv");

181 break;

182 default:

183 fprintf(stderr, "Codec is not supported by qsv\n");

184 return AVERROR(EINVAL);

185 }

186

187 if (!(decoder_ctx = avcodec_alloc_context3(decoder)))

188 return AVERROR(ENOMEM);

189

190 if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) {

191 fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n",

192 av_err2str(ret));

193 return ret;

194 }

195 decoder_ctx->framerate = av_guess_frame_rate(ifmt_ctx, video, NULL);

196

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);

201 }

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",

206 av_err2str(ret));

207

208 return ret;

209 }

210

211 static int encode_write(AVPacket *enc_pkt, AVFrame *frame)

212 {

213 int ret = 0;

214

215 av_packet_unref(enc_pkt);

216

217 if((ret = dynamic_set_parameter(encoder_ctx)) < 0) {

218 fprintf(stderr, "Failed to set dynamic parameter. Error code: %s\n",

219 av_err2str(ret));

220 goto end;

221 }

222

223 if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {

224 fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret));

225 goto end;

226 }

227 while (1) {

228 if (ret = avcodec_receive_packet(encoder_ctx, enc_pkt))

229 break;

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));

236 return ret;

237 }

238 }

239

240 end:

241 if (ret == AVERROR_EOF)

242 return 0;

243 ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);

244 return ret;

245 }

246

247 static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr)

248 {

249 AVFrame *frame;

250 int ret = 0;

251

252 ret = avcodec_send_packet(decoder_ctx, pkt);

253 if (ret < 0) {

254 fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret));

255 return ret;

256 }

257

258 while (ret >= 0) {

259 if (!(frame = av_frame_alloc()))

260 return AVERROR(ENOMEM);

261

262 ret = avcodec_receive_frame(decoder_ctx, frame);

263 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {

264 av_frame_free(&frame);

265 return 0;

266 } else if (ret < 0) {

267 fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret));

268 goto fail;

269 }

270 if (!encoder_ctx->hw_frames_ctx) {

271 AVDictionaryEntry *e = NULL;

272 AVDictionary *opts = NULL;

273 AVStream *ost;

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);

279 goto fail;

280 }

281 /* set AVCodecContext Parameters for encoder, here we keep them stay

282 * the same as decoder.

283 */

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");

290 goto fail;

291 }

292 /* There is no "framerate" option in common 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

295 * 1/framerate. */

296 e = av_dict_get(opts, "r", NULL, 0);

297 if (e) {

298 encoder_ctx->framerate = av_d2q(atof(e->value), INT_MAX);

299 encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);

300 }

301 if ((ret = avcodec_open2(encoder_ctx, enc_codec, &opts)) < 0) {

302 fprintf(stderr, "Failed to open encode codec. Error code: %s\n",

303 av_err2str(ret));

304 av_dict_free(&opts);

305 goto fail;

306 }

307 av_dict_free(&opts);

308

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);

312 goto fail;

313 }

314

315 ost->time_base = encoder_ctx->time_base;

316 ret = avcodec_parameters_from_context(ost->codecpar, encoder_ctx);

317 if (ret < 0) {

318 fprintf(stderr, "Failed to copy the stream parameters. "

319 "Error code: %s\n", av_err2str(ret));

320 goto fail;

321 }

322

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));

327 goto fail;

328 }

329 }

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");

334

335 fail:

336 av_frame_free(&frame);

337 }

338 return ret;

339 }

340

341 int main(int argc, char **argv)

342 {

343 const AVCodec *enc_codec;

344 int ret = 0;

345 AVPacket *dec_pkt = NULL;

346

347 if (argc < 5 || (argc - 5) % 2) {

348 av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <encoder> <output file>"

349 " <\"encoding option set 0\"> [<frame_number> <\"encoding options set 1\">]...\n", argv[0]);

350 return 1;

351 }

352 setting_number = (argc - 5) / 2;

353 dynamic_setting = av_malloc(setting_number * sizeof(*dynamic_setting));

354 current_setting_number = 0;

355 for (int i = 0; i < setting_number; i++) {

356 dynamic_setting[i].frame_number = atoi(argv[i*2 + 5]);

357 dynamic_setting[i].optstr = argv[i*2 + 6];

358 }

359

360 ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_QSV, NULL, NULL, 0);

361 if (ret < 0) {

362 fprintf(stderr, "Failed to create a QSV device. Error code: %s\n", av_err2str(ret));

363 goto end;

364 }

365

366 dec_pkt = av_packet_alloc();

367 if (!dec_pkt) {

368 fprintf(stderr, "Failed to allocate decode packet\n");

369 goto end;

370 }

371

372 if ((ret = open_input_file(argv[1])) < 0)

373 goto end;

374

375 if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {

376 fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);

377 ret = -1;

378 goto end;

379 }

380

381 if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {

382 fprintf(stderr, "Failed to deduce output format from file extension. Error code: "

383 "%s\n", av_err2str(ret));

384 goto end;

385 }

386

387 if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {

388 ret = AVERROR(ENOMEM);

389 goto end;

390 }

391

392 ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);

393 if (ret < 0) {

394 fprintf(stderr, "Cannot open output file. "

395 "Error code: %s\n", av_err2str(ret));

396 goto end;

397 }

398

399 /* read all packets and only transcoding video */

400 while (ret >= 0) {

401 if ((ret = av_read_frame(ifmt_ctx, dec_pkt)) < 0)

402 break;

403

404 if (video_stream == dec_pkt->stream_index)

405 ret = dec_enc(dec_pkt, enc_codec, argv[4]);

406

407 av_packet_unref(dec_pkt);

408 }

409

410 /* flush decoder */

411 av_packet_unref(dec_pkt);

412 if ((ret = dec_enc(dec_pkt, enc_codec, argv[4])) < 0) {

413 fprintf(stderr, "Failed to flush decoder %s\n", av_err2str(ret));

414 goto end;

415 }

416

417 /* flush encoder */

418 if ((ret = encode_write(dec_pkt, NULL)) < 0) {

419 fprintf(stderr, "Failed to flush encoder %s\n", av_err2str(ret));

420 goto end;

421 }

422

423 /* write the trailer for output stream */

424 if ((ret = av_write_trailer(ofmt_ctx)) < 0)

425 fprintf(stderr, "Failed to write trailer %s\n", av_err2str(ret));

426

427 end:

428 avformat_close_input(&ifmt_ctx);

429 avformat_close_input(&ofmt_ctx);

430 avcodec_free_context(&decoder_ctx);

431 avcodec_free_context(&encoder_ctx);

432 av_buffer_unref(&hw_device_ctx);

433 av_packet_free(&dec_pkt);

434 av_freep(&dynamic_setting);

435 return ret;

436 }

av_packet_unref

void av_packet_unref(AVPacket *pkt)

Wipe the packet.

Definition: packet.c:432

AVCodec

AVCodec.

Definition: codec.h:172

AVPixelFormat

Pixel format.

Definition: pixfmt.h:71

avcodec_receive_packet

int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)

Read encoded data from the encoder.

Definition: encode.c:523

AVERROR

Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions

opt.h

AVCodecContext::get_format

enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)

Callback to negotiate the pixel format.

Definition: avcodec.h:761

av_find_best_stream

int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, const AVCodec **decoder_ret, int flags)

Definition: avformat.c:376

avformat_new_stream

AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)

Add a new stream to a media file.

AVERROR_EOF

#define AVERROR_EOF

End of file.

Definition: error.h:57

get_format

static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)

Definition: qsv_transcode.c:118

DynamicSetting::optstr

char * optstr

Definition: qsv_transcode.c:53

av_frame_free

void av_frame_free(AVFrame **frame)

Free the frame and any dynamically allocated objects in it, e.g.

Definition: frame.c:64

AVFrame

This structure describes decoded (raw) audio or video data.

Definition: frame.h:427

AVFormatContext::streams

AVStream ** streams

A list of all streams in the file.

Definition: avformat.h:1332

avio_open

int avio_open(AVIOContext **s, const char *filename, int flags)

Create and initialize a AVIOContext for accessing the resource indicated by url.

Definition: avio.c:498

AVDictionary

Definition: dict.c:32

av_buffer_ref

AVBufferRef * av_buffer_ref(const AVBufferRef *buf)

Create a new reference to an AVBuffer.

Definition: buffer.c:103

av_read_frame

int av_read_frame(AVFormatContext *s, AVPacket *pkt)

Return the next frame of a stream.

Definition: demux.c:1558

ost

static AVStream * ost

Definition: vaapi_transcode.c:42

av_packet_free

void av_packet_free(AVPacket **pkt)

Free the packet, if the packet is reference counted, it will be unreferenced first.

Definition: packet.c:74

DynamicSetting

Definition: qsv_transcode.c:51

av_malloc

#define av_malloc(s)

Definition: tableprint_vlc.h:31

setting_number

static int setting_number

Definition: qsv_transcode.c:56

AVCodecContext::framerate

AVRational framerate

Definition: avcodec.h:551

avformat_close_input

void avformat_close_input(AVFormatContext **s)

Close an opened input AVFormatContext.

Definition: demux.c:367

dec_enc

static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr)

Definition: qsv_transcode.c:247

decoder

static const chunk_decoder decoder[8]

Definition: dfa.c:331

fail

#define fail()

Definition: checkasm.h:207

av_frame_alloc

AVFrame * av_frame_alloc(void)

Allocate an AVFrame and set its fields to default values.

Definition: frame.c:52

pkt

AVPacket * pkt

Definition: movenc.c:60

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:210

avformat_open_input

int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)

Open an input stream and read the header.

Definition: demux.c:221

av_dict_get

AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)

Get a dictionary entry with matching key.

Definition: dict.c:60

ofmt_ctx

static AVFormatContext * ofmt_ctx

Definition: qsv_transcode.c:46

avcodec_alloc_context3

AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)

Allocate an AVCodecContext and set its fields to default values.

Definition: options.c:149

AV_CODEC_ID_VP9

@ AV_CODEC_ID_VP9

Definition: codec_id.h:222

avcodec_receive_frame

int attribute_align_arg 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...

Definition: avcodec.c:707

pix_fmts

static enum AVPixelFormat pix_fmts[]

Definition: libkvazaar.c:296

AVIO_FLAG_WRITE

#define AVIO_FLAG_WRITE

write-only

Definition: avio.h:618

av_rescale_q

int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)

Rescale a 64-bit integer by 2 rational numbers.

Definition: mathematics.c:142

key

const char * key

Definition: hwcontext_opencl.c:189

AV_CODEC_ID_H264

@ AV_CODEC_ID_H264

Definition: codec_id.h:79

avformat_write_header

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.

Definition: mux.c:467

AVFormatContext

Format I/O context.

Definition: avformat.h:1264

opts

AVDictionary * opts

Definition: movenc.c:51

AVStream::codecpar

AVCodecParameters * codecpar

Codec parameters associated with this stream.

Definition: avformat.h:767

avcodec_parameters_to_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.

dynamic_set_parameter

static int dynamic_set_parameter(AVCodecContext *avctx)

Definition: qsv_transcode.c:82

AVStream::time_base

AVRational time_base

This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.

Definition: avformat.h:783

NULL

#define NULL

Definition: coverity.c:32

avcodec_find_decoder_by_name

const AVCodec * avcodec_find_decoder_by_name(const char *name)

Find a registered decoder with the specified name.

Definition: allcodecs.c:1066

av_buffer_unref

void av_buffer_unref(AVBufferRef **buf)

Free a given reference and automatically free the buffer if there are no more references to it.

Definition: buffer.c:139

AV_CODEC_ID_AV1

@ AV_CODEC_ID_AV1

Definition: codec_id.h:284

avcodec_free_context

void avcodec_free_context(AVCodecContext **avctx)

Free the codec context and everything associated with it and write NULL to the provided pointer.

Definition: options.c:164

AVFormatContext::pb

AVIOContext * pb

I/O context.

Definition: avformat.h:1306

avcodec_open2

int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)

Initialize the AVCodecContext to use the given AVCodec.

Definition: avcodec.c:144

open_input_file

static int open_input_file(char *filename)

Definition: qsv_transcode.c:133

AV_PIX_FMT_QSV

@ AV_PIX_FMT_QSV

HW acceleration through QSV, data[3] contains a pointer to the mfxFrameSurface1 structure.

Definition: pixfmt.h:247

dynamic_setting

static DynamicSetting * dynamic_setting

Definition: qsv_transcode.c:55

AVCodecContext::time_base

AVRational time_base

This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.

Definition: avcodec.h:535

current_setting_number

static int current_setting_number

Definition: qsv_transcode.c:57

avformat_find_stream_info

int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)

Read packets of a media file to get stream information.

Definition: demux.c:2577

main

int main(int argc, char **argv)

Definition: qsv_transcode.c:341

ifmt_ctx

static AVFormatContext * ifmt_ctx

Definition: qsv_transcode.c:46

av_err2str

#define av_err2str(errnum)

Convenience macro, the return value should be used only directly in function arguments but never stan...

Definition: error.h:122

AVCodecContext::pkt_timebase

AVRational pkt_timebase

Timebase in which pkt_dts/pts and AVPacket.dts/pts are expressed.

Definition: avcodec.h:542

av_packet_alloc

AVPacket * av_packet_alloc(void)

Allocate an AVPacket and set its fields to default values.

Definition: packet.c:63

av_dict_free

void av_dict_free(AVDictionary **pm)

Free all the memory allocated for an AVDictionary struct and all keys and values.

Definition: dict.c:233

encode_write

static int encode_write(AVPacket *enc_pkt, AVFrame *frame)

Definition: qsv_transcode.c:211

av_packet_rescale_ts

void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)

Convert valid timing fields (timestamps / durations) in a packet from one timebase to another.

Definition: packet.c:536

AV_CODEC_ID_MJPEG

@ AV_CODEC_ID_MJPEG

Definition: codec_id.h:59

avcodec_send_packet

int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)

Supply raw packet data as input to a decoder.

Definition: decode.c:708

av_write_trailer

int av_write_trailer(AVFormatContext *s)

Write the stream trailer to an output media file and free the file private data.

Definition: mux.c:1238

#define i(width, name, range_min, range_max)

Definition: cbs_h2645.c:256

video_stream

static int video_stream

Definition: qsv_transcode.c:49

encoder_ctx

static AVCodecContext * encoder_ctx

Definition: qsv_transcode.c:48

AV_CODEC_ID_HEVC

@ AV_CODEC_ID_HEVC

Definition: codec_id.h:228

value

it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value

Definition: writing_filters.txt:86

av_d2q

AVRational av_d2q(double d, int max)

Convert a double precision floating point number to a rational.

Definition: rational.c:106

av_inv_q

static av_always_inline AVRational av_inv_q(AVRational q)

Invert a rational.

Definition: rational.h:159

AVCodecContext::hw_device_ctx

AVBufferRef * hw_device_ctx

A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...

Definition: avcodec.h:1475

AVCodecContext::height

int height

Definition: avcodec.h:592

avcodec_send_frame

int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)

Supply a raw video or audio frame to the encoder.

Definition: encode.c:490

AVCodecContext::pix_fmt

enum AVPixelFormat pix_fmt

Pixel format, see AV_PIX_FMT_xxx.

Definition: avcodec.h:631

AVCodecContext::hw_frames_ctx

AVBufferRef * hw_frames_ctx

A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames.

Definition: avcodec.h:1453

avcodec.h

ret

Definition: filter_design.txt:187

AVStream

Stream structure.

Definition: avformat.h:744

av_guess_frame_rate

AVRational av_guess_frame_rate(AVFormatContext *format, AVStream *st, AVFrame *frame)

Guess the frame rate, based on both the container and codec information.

Definition: avformat.c:683

frame

these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame

Definition: filter_design.txt:265

av_hwdevice_ctx_create

int av_hwdevice_ctx_create(AVBufferRef **pdevice_ref, enum AVHWDeviceType type, const char *device, AVDictionary *opts, int flags)

Open a device of the specified type and create an AVHWDeviceContext for it.

Definition: hwcontext.c:615

avformat.h

AV_HWDEVICE_TYPE_QSV

@ AV_HWDEVICE_TYPE_QSV

Definition: hwcontext.h:33

AVCodecContext

main external API structure.

Definition: avcodec.h:431