libvpx: Pull from upstream

source/libvpx/examples/force_keyframe.c

Index: source/libvpx/examples/force_keyframe.c
===================================================================
--- source/libvpx/examples/force_keyframe.c	(revision 263011)
+++ source/libvpx/examples/force_keyframe.c	(working copy)
@@ -1,225 +0,0 @@
-/*
- *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-// Forcing A Keyframe
-// ==================
-//
-// This is an example demonstrating how to control placement of keyframes
-// on a frame-by-frame basis.
-//
-// Configuration
-// -------------
-// Keyframes can be forced by setting the VPX_EFLAG_FORCE_KF bit of the
-// flags passed to `vpx_codec_control()`. In this example, we force a
-// keyframe every 8 frames.
-//
-// Observing The Effects
-// ---------------------
-// The output of the encoder examples shows a 'K' rather than a dot '.'
-// when the encoder generates a keyframe. Note that every 8 frames a 'K'
-// is output.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#define VPX_CODEC_DISABLE_COMPAT 1
-#include "vpx/vpx_encoder.h"
-#include "vpx/vp8cx.h"
-#define interface (vpx_codec_vp8_cx())
-#define fourcc    0x30385056
-
-#define IVF_FILE_HDR_SZ  (32)
-#define IVF_FRAME_HDR_SZ (12)
-
-static void mem_put_le16(char *mem, unsigned int val) {
-    mem[0] = val;
-    mem[1] = val>>8;
-}
-
-static void mem_put_le32(char *mem, unsigned int val) {
-    mem[0] = val;
-    mem[1] = val>>8;
-    mem[2] = val>>16;
-    mem[3] = val>>24;
-}
-
-static void die(const char *fmt, ...) {
-    va_list ap;
-
-    va_start(ap, fmt);
-    vprintf(fmt, ap);
-    if(fmt[strlen(fmt)-1] != '\n')
-        printf("\n");
-    exit(EXIT_FAILURE);
-}
-
-static void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
-    const char *detail = vpx_codec_error_detail(ctx);
-
-    printf("%s: %s\n", s, vpx_codec_error(ctx));
-    if(detail)
-        printf("    %s\n",detail);
-    exit(EXIT_FAILURE);
-}
-
-static int read_frame(FILE *f, vpx_image_t *img) {
-    size_t nbytes, to_read;
-    int    res = 1;
-
-    to_read = img->w*img->h*3/2;
-    nbytes = fread(img->planes[0], 1, to_read, f);
-    if(nbytes != to_read) {
-        res = 0;
-        if(nbytes > 0)
-            printf("Warning: Read partial frame. Check your width & height!\n");
-    }
-    return res;
-}
-
-static void write_ivf_file_header(FILE *outfile,
-                                  const vpx_codec_enc_cfg_t *cfg,
-                                  int frame_cnt) {
-    char header[32];
-
-    if(cfg->g_pass != VPX_RC_ONE_PASS && cfg->g_pass != VPX_RC_LAST_PASS)
-        return;
-    header[0] = 'D';
-    header[1] = 'K';
-    header[2] = 'I';
-    header[3] = 'F';
-    mem_put_le16(header+4,  0);                   /* version */
-    mem_put_le16(header+6,  32);                  /* headersize */
-    mem_put_le32(header+8,  fourcc);              /* headersize */
-    mem_put_le16(header+12, cfg->g_w);            /* width */
-    mem_put_le16(header+14, cfg->g_h);            /* height */
-    mem_put_le32(header+16, cfg->g_timebase.den); /* rate */
-    mem_put_le32(header+20, cfg->g_timebase.num); /* scale */
-    mem_put_le32(header+24, frame_cnt);           /* length */
-    mem_put_le32(header+28, 0);                   /* unused */
-
-    (void) fwrite(header, 1, 32, outfile);
-}
-
-
-static void write_ivf_frame_header(FILE *outfile,
-                                   const vpx_codec_cx_pkt_t *pkt)
-{
-    char             header[12];
-    vpx_codec_pts_t  pts;
-
-    if(pkt->kind != VPX_CODEC_CX_FRAME_PKT)
-        return;
-
-    pts = pkt->data.frame.pts;
-    mem_put_le32(header, (unsigned int)pkt->data.frame.sz);
-    mem_put_le32(header+4, pts&0xFFFFFFFF);
-    mem_put_le32(header+8, pts >> 32);
-
-    (void) fwrite(header, 1, 12, outfile);
-}
-
-int main(int argc, char **argv) {
-    FILE                *infile, *outfile;
-    vpx_codec_ctx_t      codec;
-    vpx_codec_enc_cfg_t  cfg;
-    int                  frame_cnt = 0;
-    vpx_image_t          raw;
-    vpx_codec_err_t      res;
-    long                 width;
-    long                 height;
-    int                  frame_avail;
-    int                  got_data;
-    int                  flags = 0;
-
-    /* Open files */
-    if(argc!=5)
-        die("Usage: %s <width> <height> <infile> <outfile>\n", argv[0]);
-    width = strtol(argv[1], NULL, 0);
-    height = strtol(argv[2], NULL, 0);
-    if(width < 16 || width%2 || height <16 || height%2)
-        die("Invalid resolution: %ldx%ld", width, height);
-    if(!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, width, height, 1))
-        die("Faile to allocate image", width, height);
-    if(!(outfile = fopen(argv[4], "wb")))
-        die("Failed to open %s for writing", argv[4]);
-
-    printf("Using %s\n",vpx_codec_iface_name(interface));
-
-    /* Populate encoder configuration */
-    res = vpx_codec_enc_config_default(interface, &cfg, 0);
-    if(res) {
-        printf("Failed to get config: %s\n", vpx_codec_err_to_string(res));
-        return EXIT_FAILURE;
-    }
-
-    /* Update the default configuration with our settings */
-    cfg.rc_target_bitrate = width * height * cfg.rc_target_bitrate
-                            / cfg.g_w / cfg.g_h;
-    cfg.g_w = width;
-    cfg.g_h = height;
-
-    write_ivf_file_header(outfile, &cfg, 0);
-
-
-        /* Open input file for this encoding pass */
-        if(!(infile = fopen(argv[3], "rb")))
-            die("Failed to open %s for reading", argv[3]);
-
-        /* Initialize codec */
-        if(vpx_codec_enc_init(&codec, interface, &cfg, 0))
-            die_codec(&codec, "Failed to initialize encoder");
-
-        frame_avail = 1;
-        got_data = 0;
-        while(frame_avail || got_data) {
-            vpx_codec_iter_t iter = NULL;
-            const vpx_codec_cx_pkt_t *pkt;
-
-            if(!(frame_cnt & 7))
-                flags |= VPX_EFLAG_FORCE_KF;
-            else
-                flags &= ~VPX_EFLAG_FORCE_KF;
-            frame_avail = read_frame(infile, &raw);
-            if(vpx_codec_encode(&codec, frame_avail? &raw : NULL, frame_cnt,
-                                1, flags, VPX_DL_REALTIME))
-                die_codec(&codec, "Failed to encode frame");
-            got_data = 0;
-            while( (pkt = vpx_codec_get_cx_data(&codec, &iter)) ) {
-                got_data = 1;
-                switch(pkt->kind) {
-                case VPX_CODEC_CX_FRAME_PKT:
-                    write_ivf_frame_header(outfile, pkt);
-                    (void) fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
-                                  outfile);
-                    break;
-                default:
-                    break;
-                }
-                printf(pkt->kind == VPX_CODEC_CX_FRAME_PKT
-                       && (pkt->data.frame.flags & VPX_FRAME_IS_KEY)? "K":".");
-                fflush(stdout);
-            }
-            frame_cnt++;
-        }
-        printf("\n");
-        fclose(infile);
-
-    printf("Processed %d frames.\n",frame_cnt-1);
-    vpx_img_free(&raw);
-    if(vpx_codec_destroy(&codec))
-        die_codec(&codec, "Failed to destroy codec");
-
-    /* Try to rewrite the file header with the actual frame count */
-    if(!fseek(outfile, 0, SEEK_SET))
-        write_ivf_file_header(outfile, &cfg, frame_cnt-1);
-    fclose(outfile);
-    return EXIT_SUCCESS;
-}