src/third_party/libvpx/examples/twopass_encoder.c - cobalt - Git at Google

 /*
  *  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;
 }
	/*
	* 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;
	}