/* *  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. */ // Two Pass Encoder// ================//// This is an example of a two pass encoder loop. It takes an input file in// YV12 format, passes it through the encoder twice, and writes the compressed// frames to disk in IVF format. It builds upon the simple_encoder example.//// Twopass Variables// -----------------// Twopass mode needs to track the current pass number and the buffer of// statistics packets.//// Updating The Configuration// ---------------------------------// In two pass mode, the configuration has to be updated on each pass. The// statistics buffer is passed on the last pass.//// Encoding A Frame// ----------------// Encoding a frame in two pass mode is identical to the simple encoder// example. To increase the quality while sacrificing encoding speed,// VPX_DL_BEST_QUALITY can be used in place of VPX_DL_GOOD_QUALITY.//// Processing Statistics Packets// -----------------------------// Each packet of type `VPX_CODEC_CX_FRAME_PKT` contains the encoded data// for this frame. We write a IVF frame header, followed by the raw data.////// Pass Progress Reporting// -----------------------------// It's sometimes helpful to see when each pass completes.////// Clean-up// -----------------------------// Destruction of the encoder instance must be done on each pass. The// raw image should be destroyed at the end as usual. #include <stdio.h>#include <stdlib.h>#include <string.h> #include "vpx/vpx_encoder.h" #include "../tools_common.h"#include "../video_writer.h" static const char *exec_name; void usage_exit(void) {  fprintf(stderr,          "Usage: %s <codec> <width> <height> <infile> <outfile> "          "<frame limit>\n",          exec_name);  exit(EXIT_FAILURE);} static int get_frame_stats(vpx_codec_ctx_t *ctx, const vpx_image_t *img,                           vpx_codec_pts_t pts, unsigned int duration,                           vpx_enc_frame_flags_t flags, unsigned int deadline,                           vpx_fixed_buf_t *stats) {  int got_pkts = 0;  vpx_codec_iter_t iter = NULL;  const vpx_codec_cx_pkt_t *pkt = NULL;  const vpx_codec_err_t res =      vpx_codec_encode(ctx, img, pts, duration, flags, deadline);  if (res != VPX_CODEC_OK) die_codec(ctx, "Failed to get frame stats.");   while ((pkt = vpx_codec_get_cx_data(ctx, &iter)) != NULL) {    got_pkts = 1;     if (pkt->kind == VPX_CODEC_STATS_PKT) {      const uint8_t *const pkt_buf = pkt->data.twopass_stats.buf;      const size_t pkt_size = pkt->data.twopass_stats.sz;      stats->buf = realloc(stats->buf, stats->sz + pkt_size);      memcpy((uint8_t *)stats->buf + stats->sz, pkt_buf, pkt_size);      stats->sz += pkt_size;    }  }   return got_pkts;} static int encode_frame(vpx_codec_ctx_t *ctx, const vpx_image_t *img,                        vpx_codec_pts_t pts, unsigned int duration,                        vpx_enc_frame_flags_t flags, unsigned int deadline,                        VpxVideoWriter *writer) {  int got_pkts = 0;  vpx_codec_iter_t iter = NULL;  const vpx_codec_cx_pkt_t *pkt = NULL;  const vpx_codec_err_t res =      vpx_codec_encode(ctx, img, pts, duration, flags, deadline);  if (res != VPX_CODEC_OK) die_codec(ctx, "Failed to encode frame.");   while ((pkt = vpx_codec_get_cx_data(ctx, &iter)) != NULL) {    got_pkts = 1;    if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {      const int keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;       if (!vpx_video_writer_write_frame(writer, pkt->data.frame.buf,                                        pkt->data.frame.sz,                                        pkt->data.frame.pts))        die_codec(ctx, "Failed to write compressed frame.");      printf(keyframe ? "K" : ".");      fflush(stdout);    }  }   return got_pkts;} static vpx_fixed_buf_t pass0(vpx_image_t *raw, FILE *infile,                             const VpxInterface *encoder,                             const vpx_codec_enc_cfg_t *cfg, int max_frames) {  vpx_codec_ctx_t codec;  int frame_count = 0;  vpx_fixed_buf_t stats = { NULL, 0 };   if (vpx_codec_enc_init(&codec, encoder->codec_interface(), cfg, 0))    die("Failed to initialize encoder");   // Calculate frame statistics.  while (vpx_img_read(raw, infile)) {    ++frame_count;    get_frame_stats(&codec, raw, frame_count, 1, 0, VPX_DL_GOOD_QUALITY,                    &stats);    if (max_frames > 0 && frame_count >= max_frames) break;  }   // Flush encoder.  while (get_frame_stats(&codec, NULL, frame_count, 1, 0, VPX_DL_GOOD_QUALITY,                         &stats)) {  }   printf("Pass 0 complete. Processed %d frames.\n", frame_count);  if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");   return stats;} static void pass1(vpx_image_t *raw, FILE *infile, const char *outfile_name,                  const VpxInterface *encoder, const vpx_codec_enc_cfg_t *cfg,                  int max_frames) {  VpxVideoInfo info = { encoder->fourcc,                        cfg->g_w,                        cfg->g_h,                        { cfg->g_timebase.num, cfg->g_timebase.den } };  VpxVideoWriter *writer = NULL;  vpx_codec_ctx_t codec;  int frame_count = 0;   writer = vpx_video_writer_open(outfile_name, kContainerIVF, &info);  if (!writer) die("Failed to open %s for writing", outfile_name);   if (vpx_codec_enc_init(&codec, encoder->codec_interface(), cfg, 0))    die("Failed to initialize encoder");   // Encode frames.  while (vpx_img_read(raw, infile)) {    ++frame_count;    encode_frame(&codec, raw, frame_count, 1, 0, VPX_DL_GOOD_QUALITY, writer);     if (max_frames > 0 && frame_count >= max_frames) break;  }   // Flush encoder.  while (encode_frame(&codec, NULL, -1, 1, 0, VPX_DL_GOOD_QUALITY, writer)) {  }   printf("\n");   if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");   vpx_video_writer_close(writer);   printf("Pass 1 complete. Processed %d frames.\n", frame_count);} int main(int argc, char **argv) {  FILE *infile = NULL;  int w, h;  vpx_codec_ctx_t codec;  vpx_codec_enc_cfg_t cfg;  vpx_image_t raw;  vpx_codec_err_t res;  vpx_fixed_buf_t stats;   const VpxInterface *encoder = NULL;  const int fps = 30;       // TODO(dkovalev) add command line argument  const int bitrate = 200;  // kbit/s TODO(dkovalev) add command line argument  const char *const codec_arg = argv[1];  const char *const width_arg = argv[2];  const char *const height_arg = argv[3];  const char *const infile_arg = argv[4];  const char *const outfile_arg = argv[5];  int max_frames = 0;  exec_name = argv[0];   if (argc != 7) die("Invalid number of arguments.");   max_frames = (int)strtol(argv[6], NULL, 0);   encoder = get_vpx_encoder_by_name(codec_arg);  if (!encoder) die("Unsupported codec.");   w = (int)strtol(width_arg, NULL, 0);  h = (int)strtol(height_arg, NULL, 0);   if (w <= 0 || h <= 0 || (w % 2) != 0 || (h % 2) != 0)    die("Invalid frame size: %dx%d", w, h);   if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, w, h, 1))    die("Failed to allocate image", w, h);   printf("Using %s\n", vpx_codec_iface_name(encoder->codec_interface()));   // Configuration  res = vpx_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);  if (res) die_codec(&codec, "Failed to get default codec config.");   cfg.g_w = w;  cfg.g_h = h;  cfg.g_timebase.num = 1;  cfg.g_timebase.den = fps;  cfg.rc_target_bitrate = bitrate;   if (!(infile = fopen(infile_arg, "rb")))    die("Failed to open %s for reading", infile_arg);   // Pass 0  cfg.g_pass = VPX_RC_FIRST_PASS;  stats = pass0(&raw, infile, encoder, &cfg, max_frames);   // Pass 1  rewind(infile);  cfg.g_pass = VPX_RC_LAST_PASS;  cfg.rc_twopass_stats_in = stats;  pass1(&raw, infile, outfile_arg, encoder, &cfg, max_frames);  free(stats.buf);   vpx_img_free(&raw);  fclose(infile);   return EXIT_SUCCESS;}