libvpx: Pull from upstream

source/libvpx/examples/force_keyframe.c

Index: source/libvpx/examples/force_keyframe.c
===================================================================
--- source/libvpx/examples/force_keyframe.c	(revision 0)
+++ source/libvpx/examples/force_keyframe.c	(revision 0)
@@ -0,0 +1,225 @@
+/*
+ *  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, 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;
+}