FFmpeg/doc/examples/vaapi_transcode.c at master · FFmpeg/FFmpeg · GitHub

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* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

/**

* @file Intel VAAPI-accelerated transcoding API usage example

* @example vaapi_transcode.c

* Perform VAAPI-accelerated transcoding.

* Usage: vaapi_transcode input_stream codec output_stream

* e.g: - vaapi_transcode input.mp4 h264_vaapi output_h264.mp4

* - vaapi_transcode input.mp4 vp9_vaapi output_vp9.ivf

#include <stdio.h>

#include <errno.h>

#include <libavutil/hwcontext.h>

#include <libavcodec/avcodec.h>

#include <libavformat/avformat.h>

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

static AVBufferRef *hw_device_ctx = NULL;

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

static int video_stream = -1;

static AVStream *ost;

static int initialized = 0;

static enum AVPixelFormat get_vaapi_format(AVCodecContext *ctx,

const enum AVPixelFormat *pix_fmts)

{

const enum AVPixelFormat *p;

for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {

if (*p == AV_PIX_FMT_VAAPI)

return *p;

}

fprintf(stderr, "Unable to decode this file using VA-API.\n");

return AV_PIX_FMT_NONE;

}

static int open_input_file(const char *filename)

{

int ret;

const AVCodec *decoder = NULL;

AVStream *video = NULL;

if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {

fprintf(stderr, "Cannot open input file '%s', Error code: %s\n",

filename, av_err2str(ret));

return ret;

}

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

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

av_err2str(ret));

return ret;

}

ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0);

if (ret < 0) {

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

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

return ret;

}

video_stream = ret;

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

return AVERROR(ENOMEM);

video = ifmt_ctx->streams[video_stream];

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

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

av_err2str(ret));

return ret;

}

decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);

if (!decoder_ctx->hw_device_ctx) {

fprintf(stderr, "A hardware device reference create failed.\n");

return AVERROR(ENOMEM);

}

decoder_ctx->get_format = get_vaapi_format;

if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0)

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

av_err2str(ret));

return ret;

}

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

{

int ret = 0;

av_packet_unref(enc_pkt);

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

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

goto end;

}

while (1) {

ret = avcodec_receive_packet(encoder_ctx, enc_pkt);

if (ret)

break;

enc_pkt->stream_index = 0;

av_packet_rescale_ts(enc_pkt, ifmt_ctx->streams[video_stream]->time_base,

ofmt_ctx->streams[0]->time_base);

ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt);

if (ret < 0) {

fprintf(stderr, "Error during writing data to output file. "

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

return -1;

}

end:

if (ret == AVERROR_EOF)

return 0;

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

return ret;

}

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

{

AVFrame *frame;

int ret = 0;

ret = avcodec_send_packet(decoder_ctx, pkt);

if (ret < 0) {

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

return ret;

}

while (ret >= 0) {

if (!(frame = av_frame_alloc()))

return AVERROR(ENOMEM);

ret = avcodec_receive_frame(decoder_ctx, frame);

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

av_frame_free(&frame);

return 0;

} else if (ret < 0) {

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

goto fail;

}

if (!initialized) {

/* we need to ref hw_frames_ctx of decoder to initialize encoder's codec.

Only after we get a decoded frame, can we obtain its hw_frames_ctx */

encoder_ctx->hw_frames_ctx = av_buffer_ref(decoder_ctx->hw_frames_ctx);

if (!encoder_ctx->hw_frames_ctx) {

ret = AVERROR(ENOMEM);

goto fail;

}

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

* the same as decoder.

* xxx: now the sample can't handle resolution change case.

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

encoder_ctx->pix_fmt = AV_PIX_FMT_VAAPI;

encoder_ctx->width = decoder_ctx->width;

encoder_ctx->height = decoder_ctx->height;

if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) {

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

av_err2str(ret));

goto fail;

}

if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {

fprintf(stderr, "Failed to allocate stream for output format.\n");

ret = AVERROR(ENOMEM);

goto fail;

}

ost->time_base = encoder_ctx->time_base;

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

if (ret < 0) {

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

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

goto fail;

}

/* write the stream header */

if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {

fprintf(stderr, "Error while writing stream header. "

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

goto fail;

}

initialized = 1;

}

if ((ret = encode_write(pkt, frame)) < 0)

fprintf(stderr, "Error during encoding and writing.\n");

fail:

av_frame_free(&frame);

}

return ret;

}

int main(int argc, char **argv)

{

const AVCodec *enc_codec;

int ret = 0;

AVPacket *dec_pkt;

if (argc != 4) {

fprintf(stderr, "Usage: %s <input file> <encode codec> <output file>\n"

"The output format is guessed according to the file extension.\n"

"\n", argv[0]);

return -1;

}

ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI, NULL, NULL, 0);

if (ret < 0) {

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

return -1;

}

dec_pkt = av_packet_alloc();

if (!dec_pkt) {

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

goto end;

}

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

goto end;

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

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

ret = -1;

goto end;

}

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

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

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

goto end;

}

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

ret = AVERROR(ENOMEM);

goto end;

}

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

if (ret < 0) {

fprintf(stderr, "Cannot open output file. "

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

goto end;

}

/* read all packets and only transcoding video */

while (ret >= 0) {

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

break;

if (video_stream == dec_pkt->stream_index)

ret = dec_enc(dec_pkt, enc_codec);

av_packet_unref(dec_pkt);

}

/* flush decoder */

av_packet_unref(dec_pkt);

ret = dec_enc(dec_pkt, enc_codec);

/* flush encoder */

ret = encode_write(dec_pkt, NULL);

/* write the trailer for output stream */

av_write_trailer(ofmt_ctx);

end:

avformat_close_input(&ifmt_ctx);

if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE))

avio_closep(&ofmt_ctx->pb);

avformat_free_context(ofmt_ctx);

avcodec_free_context(&decoder_ctx);

avcodec_free_context(&encoder_ctx);

av_buffer_unref(&hw_device_ctx);

av_packet_free(&dec_pkt);

return ret;

}

FFmpeg/doc/examples/vaapi_transcode.c at master · FFmpeg/FFmpeg · GitHub

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