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