| /* |
| * Copyright (c) 2001 Fabrice Bellard |
| * |
| * 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 |
| * video encoding with libavcodec API example |
| * |
| * @example encode_video.c |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <libavcodec/avcodec.h> |
| |
| #include <libavutil/opt.h> |
| #include <libavutil/imgutils.h> |
| |
| static void encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt, |
| FILE *outfile) |
| { |
| int ret; |
| |
| /* send the frame to the encoder */ |
| if (frame) |
| printf("Send frame %3"PRId64"\n", frame->pts); |
| |
| ret = avcodec_send_frame(enc_ctx, frame); |
| if (ret < 0) { |
| fprintf(stderr, "Error sending a frame for encoding\n"); |
| exit(1); |
| } |
| |
| while (ret >= 0) { |
| ret = avcodec_receive_packet(enc_ctx, pkt); |
| if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) |
| return; |
| else if (ret < 0) { |
| fprintf(stderr, "Error during encoding\n"); |
| exit(1); |
| } |
| |
| printf("Write packet %3"PRId64" (size=%5d)\n", pkt->pts, pkt->size); |
| fwrite(pkt->data, 1, pkt->size, outfile); |
| av_packet_unref(pkt); |
| } |
| } |
| |
| int main(int argc, char **argv) |
| { |
| const char *filename, *codec_name; |
| const AVCodec *codec; |
| AVCodecContext *c= NULL; |
| int i, ret, x, y; |
| FILE *f; |
| AVFrame *frame; |
| AVPacket *pkt; |
| uint8_t endcode[] = { 0, 0, 1, 0xb7 }; |
| |
| if (argc <= 2) { |
| fprintf(stderr, "Usage: %s <output file> <codec name>\n", argv[0]); |
| exit(0); |
| } |
| filename = argv[1]; |
| codec_name = argv[2]; |
| |
| /* find the mpeg1video encoder */ |
| codec = avcodec_find_encoder_by_name(codec_name); |
| if (!codec) { |
| fprintf(stderr, "Codec '%s' not found\n", codec_name); |
| exit(1); |
| } |
| |
| c = avcodec_alloc_context3(codec); |
| if (!c) { |
| fprintf(stderr, "Could not allocate video codec context\n"); |
| exit(1); |
| } |
| |
| pkt = av_packet_alloc(); |
| if (!pkt) |
| exit(1); |
| |
| /* put sample parameters */ |
| c->bit_rate = 400000; |
| /* resolution must be a multiple of two */ |
| c->width = 352; |
| c->height = 288; |
| /* frames per second */ |
| c->time_base = (AVRational){1, 25}; |
| c->framerate = (AVRational){25, 1}; |
| |
| /* emit one intra frame every ten frames |
| * check frame pict_type before passing frame |
| * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I |
| * then gop_size is ignored and the output of encoder |
| * will always be I frame irrespective to gop_size |
| */ |
| c->gop_size = 10; |
| c->max_b_frames = 1; |
| c->pix_fmt = AV_PIX_FMT_YUV420P; |
| |
| if (codec->id == AV_CODEC_ID_H264) |
| av_opt_set(c->priv_data, "preset", "slow", 0); |
| |
| /* open it */ |
| ret = avcodec_open2(c, codec, NULL); |
| if (ret < 0) { |
| fprintf(stderr, "Could not open codec: %s\n", av_err2str(ret)); |
| exit(1); |
| } |
| |
| f = fopen(filename, "wb"); |
| if (!f) { |
| fprintf(stderr, "Could not open %s\n", filename); |
| exit(1); |
| } |
| |
| frame = av_frame_alloc(); |
| if (!frame) { |
| fprintf(stderr, "Could not allocate video frame\n"); |
| exit(1); |
| } |
| frame->format = c->pix_fmt; |
| frame->width = c->width; |
| frame->height = c->height; |
| |
| ret = av_frame_get_buffer(frame, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Could not allocate the video frame data\n"); |
| exit(1); |
| } |
| |
| /* encode 1 second of video */ |
| for (i = 0; i < 25; i++) { |
| fflush(stdout); |
| |
| /* make sure the frame data is writable */ |
| ret = av_frame_make_writable(frame); |
| if (ret < 0) |
| exit(1); |
| |
| /* prepare a dummy image */ |
| /* Y */ |
| for (y = 0; y < c->height; y++) { |
| for (x = 0; x < c->width; x++) { |
| frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3; |
| } |
| } |
| |
| /* Cb and Cr */ |
| for (y = 0; y < c->height/2; y++) { |
| for (x = 0; x < c->width/2; x++) { |
| frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2; |
| frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5; |
| } |
| } |
| |
| frame->pts = i; |
| |
| /* encode the image */ |
| encode(c, frame, pkt, f); |
| } |
| |
| /* flush the encoder */ |
| encode(c, NULL, pkt, f); |
| |
| /* add sequence end code to have a real MPEG file */ |
| if (codec->id == AV_CODEC_ID_MPEG1VIDEO || codec->id == AV_CODEC_ID_MPEG2VIDEO) |
| fwrite(endcode, 1, sizeof(endcode), f); |
| fclose(f); |
| |
| avcodec_free_context(&c); |
| av_frame_free(&frame); |
| av_packet_free(&pkt); |
| |
| return 0; |
| } |