mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 06:48:25 -05:00
199 lines
5.5 KiB
C
199 lines
5.5 KiB
C
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/*
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* Copyright (c) 2001 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* @file
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* video encoding with libavcodec API example
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*
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* @example encode_video.c
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libavcodec/avcodec.h>
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#include <libavutil/opt.h>
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#include <libavutil/imgutils.h>
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static void encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt,
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FILE *outfile)
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{
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int ret;
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/* send the frame to the encoder */
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if (frame)
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printf("Send frame %3"PRId64"\n", frame->pts);
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ret = avcodec_send_frame(enc_ctx, frame);
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if (ret < 0) {
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fprintf(stderr, "Error sending a frame for encoding\n");
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exit(1);
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}
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while (ret >= 0) {
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ret = avcodec_receive_packet(enc_ctx, pkt);
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
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return;
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else if (ret < 0) {
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fprintf(stderr, "Error during encoding\n");
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exit(1);
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}
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printf("Write packet %3"PRId64" (size=%5d)\n", pkt->pts, pkt->size);
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fwrite(pkt->data, 1, pkt->size, outfile);
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av_packet_unref(pkt);
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}
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}
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int main(int argc, char **argv)
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{
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const char *filename, *codec_name;
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const AVCodec *codec;
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AVCodecContext *c= NULL;
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int i, ret, x, y;
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FILE *f;
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AVFrame *frame;
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AVPacket *pkt;
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uint8_t endcode[] = { 0, 0, 1, 0xb7 };
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if (argc <= 2) {
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fprintf(stderr, "Usage: %s <output file> <codec name>\n", argv[0]);
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exit(0);
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}
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filename = argv[1];
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codec_name = argv[2];
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/* find the mpeg1video encoder */
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codec = avcodec_find_encoder_by_name(codec_name);
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if (!codec) {
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fprintf(stderr, "Codec '%s' not found\n", codec_name);
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exit(1);
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}
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c = avcodec_alloc_context3(codec);
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if (!c) {
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fprintf(stderr, "Could not allocate video codec context\n");
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exit(1);
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}
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pkt = av_packet_alloc();
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if (!pkt)
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exit(1);
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/* put sample parameters */
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c->bit_rate = 400000;
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/* resolution must be a multiple of two */
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c->width = 352;
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c->height = 288;
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/* frames per second */
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c->time_base = (AVRational){1, 25};
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c->framerate = (AVRational){25, 1};
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/* emit one intra frame every ten frames
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* check frame pict_type before passing frame
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* to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
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* then gop_size is ignored and the output of encoder
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* will always be I frame irrespective to gop_size
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*/
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c->gop_size = 10;
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c->max_b_frames = 1;
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c->pix_fmt = AV_PIX_FMT_YUV420P;
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if (codec->id == AV_CODEC_ID_H264)
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av_opt_set(c->priv_data, "preset", "slow", 0);
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/* open it */
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ret = avcodec_open2(c, codec, NULL);
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if (ret < 0) {
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fprintf(stderr, "Could not open codec: %s\n", av_err2str(ret));
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exit(1);
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}
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f = fopen(filename, "wb");
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if (!f) {
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fprintf(stderr, "Could not open %s\n", filename);
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exit(1);
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}
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frame = av_frame_alloc();
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if (!frame) {
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fprintf(stderr, "Could not allocate video frame\n");
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exit(1);
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}
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frame->format = c->pix_fmt;
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frame->width = c->width;
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frame->height = c->height;
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ret = av_frame_get_buffer(frame, 0);
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if (ret < 0) {
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fprintf(stderr, "Could not allocate the video frame data\n");
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exit(1);
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}
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/* encode 1 second of video */
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for (i = 0; i < 25; i++) {
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fflush(stdout);
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/* make sure the frame data is writable */
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ret = av_frame_make_writable(frame);
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if (ret < 0)
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exit(1);
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/* prepare a dummy image */
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/* Y */
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for (y = 0; y < c->height; y++) {
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for (x = 0; x < c->width; x++) {
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frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
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}
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}
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/* Cb and Cr */
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for (y = 0; y < c->height/2; y++) {
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for (x = 0; x < c->width/2; x++) {
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frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
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frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
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}
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}
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frame->pts = i;
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/* encode the image */
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encode(c, frame, pkt, f);
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}
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/* flush the encoder */
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encode(c, NULL, pkt, f);
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/* add sequence end code to have a real MPEG file */
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if (codec->id == AV_CODEC_ID_MPEG1VIDEO || codec->id == AV_CODEC_ID_MPEG2VIDEO)
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fwrite(endcode, 1, sizeof(endcode), f);
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fclose(f);
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avcodec_free_context(&c);
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av_frame_free(&frame);
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av_packet_free(&pkt);
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return 0;
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}
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