226 lines
7.1 KiB
C
226 lines
7.1 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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// Forcing A Keyframe
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// ==================
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//
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// This is an example demonstrating how to control placement of keyframes
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// on a frame-by-frame basis.
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//
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// Configuration
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// -------------
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// Keyframes can be forced by setting the VPX_EFLAG_FORCE_KF bit of the
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// flags passed to `vpx_codec_control()`. In this example, we force a
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// keyframe every 8 frames.
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//
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// Observing The Effects
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// ---------------------
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// The output of the encoder examples shows a 'K' rather than a dot '.'
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// when the encoder generates a keyframe. Note that every 8 frames a 'K'
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// is output.
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#define VPX_CODEC_DISABLE_COMPAT 1
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#include "vpx/vpx_encoder.h"
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#include "vpx/vp8cx.h"
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#define interface (vpx_codec_vp8_cx())
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#define fourcc 0x30385056
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#define IVF_FILE_HDR_SZ (32)
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#define IVF_FRAME_HDR_SZ (12)
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static void mem_put_le16(char *mem, unsigned int val) {
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mem[0] = val;
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mem[1] = val>>8;
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}
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static void mem_put_le32(char *mem, unsigned int val) {
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mem[0] = val;
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mem[1] = val>>8;
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mem[2] = val>>16;
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mem[3] = val>>24;
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}
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static void die(const char *fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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vprintf(fmt, ap);
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if(fmt[strlen(fmt)-1] != '\n')
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printf("\n");
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exit(EXIT_FAILURE);
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}
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static void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
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const char *detail = vpx_codec_error_detail(ctx);
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printf("%s: %s\n", s, vpx_codec_error(ctx));
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if(detail)
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printf(" %s\n",detail);
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exit(EXIT_FAILURE);
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}
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static int read_frame(FILE *f, vpx_image_t *img) {
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size_t nbytes, to_read;
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int res = 1;
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to_read = img->w*img->h*3/2;
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nbytes = fread(img->planes[0], 1, to_read, f);
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if(nbytes != to_read) {
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res = 0;
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if(nbytes > 0)
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printf("Warning: Read partial frame. Check your width & height!\n");
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}
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return res;
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}
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static void write_ivf_file_header(FILE *outfile,
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const vpx_codec_enc_cfg_t *cfg,
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int frame_cnt) {
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char header[32];
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if(cfg->g_pass != VPX_RC_ONE_PASS && cfg->g_pass != VPX_RC_LAST_PASS)
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return;
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header[0] = 'D';
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header[1] = 'K';
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header[2] = 'I';
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header[3] = 'F';
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mem_put_le16(header+4, 0); /* version */
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mem_put_le16(header+6, 32); /* headersize */
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mem_put_le32(header+8, fourcc); /* headersize */
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mem_put_le16(header+12, cfg->g_w); /* width */
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mem_put_le16(header+14, cfg->g_h); /* height */
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mem_put_le32(header+16, cfg->g_timebase.den); /* rate */
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mem_put_le32(header+20, cfg->g_timebase.num); /* scale */
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mem_put_le32(header+24, frame_cnt); /* length */
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mem_put_le32(header+28, 0); /* unused */
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(void) fwrite(header, 1, 32, outfile);
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}
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static void write_ivf_frame_header(FILE *outfile,
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const vpx_codec_cx_pkt_t *pkt)
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{
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char header[12];
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vpx_codec_pts_t pts;
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if(pkt->kind != VPX_CODEC_CX_FRAME_PKT)
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return;
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pts = pkt->data.frame.pts;
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mem_put_le32(header, (unsigned int)pkt->data.frame.sz);
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mem_put_le32(header+4, pts&0xFFFFFFFF);
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mem_put_le32(header+8, pts >> 32);
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(void) fwrite(header, 1, 12, outfile);
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}
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int main(int argc, char **argv) {
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FILE *infile, *outfile;
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vpx_codec_ctx_t codec;
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vpx_codec_enc_cfg_t cfg;
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int frame_cnt = 0;
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vpx_image_t raw;
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vpx_codec_err_t res;
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long width;
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long height;
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int frame_avail;
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int got_data;
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int flags = 0;
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/* Open files */
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if(argc!=5)
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die("Usage: %s <width> <height> <infile> <outfile>\n", argv[0]);
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width = strtol(argv[1], NULL, 0);
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height = strtol(argv[2], NULL, 0);
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if(width < 16 || width%2 || height <16 || height%2)
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die("Invalid resolution: %ldx%ld", width, height);
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if(!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, width, height, 1))
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die("Faile to allocate image", width, height);
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if(!(outfile = fopen(argv[4], "wb")))
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die("Failed to open %s for writing", argv[4]);
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printf("Using %s\n",vpx_codec_iface_name(interface));
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/* Populate encoder configuration */
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res = vpx_codec_enc_config_default(interface, &cfg, 0);
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if(res) {
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printf("Failed to get config: %s\n", vpx_codec_err_to_string(res));
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return EXIT_FAILURE;
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}
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/* Update the default configuration with our settings */
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cfg.rc_target_bitrate = width * height * cfg.rc_target_bitrate
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/ cfg.g_w / cfg.g_h;
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cfg.g_w = width;
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cfg.g_h = height;
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write_ivf_file_header(outfile, &cfg, 0);
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/* Open input file for this encoding pass */
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if(!(infile = fopen(argv[3], "rb")))
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die("Failed to open %s for reading", argv[3]);
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/* Initialize codec */
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if(vpx_codec_enc_init(&codec, interface, &cfg, 0))
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die_codec(&codec, "Failed to initialize encoder");
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frame_avail = 1;
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got_data = 0;
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while(frame_avail || got_data) {
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vpx_codec_iter_t iter = NULL;
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const vpx_codec_cx_pkt_t *pkt;
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if(!(frame_cnt & 7))
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flags |= VPX_EFLAG_FORCE_KF;
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else
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flags &= ~VPX_EFLAG_FORCE_KF;
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frame_avail = read_frame(infile, &raw);
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if(vpx_codec_encode(&codec, frame_avail? &raw : NULL, frame_cnt,
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1, flags, VPX_DL_REALTIME))
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die_codec(&codec, "Failed to encode frame");
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got_data = 0;
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while( (pkt = vpx_codec_get_cx_data(&codec, &iter)) ) {
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got_data = 1;
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switch(pkt->kind) {
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case VPX_CODEC_CX_FRAME_PKT:
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write_ivf_frame_header(outfile, pkt);
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(void) fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
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outfile);
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break;
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default:
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break;
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}
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printf(pkt->kind == VPX_CODEC_CX_FRAME_PKT
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&& (pkt->data.frame.flags & VPX_FRAME_IS_KEY)? "K":".");
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fflush(stdout);
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}
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frame_cnt++;
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}
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printf("\n");
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fclose(infile);
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printf("Processed %d frames.\n",frame_cnt-1);
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vpx_img_free(&raw);
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if(vpx_codec_destroy(&codec))
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die_codec(&codec, "Failed to destroy codec");
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/* Try to rewrite the file header with the actual frame count */
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if(!fseek(outfile, 0, SEEK_SET))
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write_ivf_file_header(outfile, &cfg, frame_cnt-1);
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fclose(outfile);
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return EXIT_SUCCESS;
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}
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