270 строки
9.6 KiB
C
270 строки
9.6 KiB
C
/*
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* Copyright (c) 2012 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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/*
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* This is an example demonstrating how to implement a multi-layer
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* VP9 encoding scheme based on spatial scalability for video applications
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* that benefit from a scalable bitstream.
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*/
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "./args.h"
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#include "./ivfenc.h"
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#include "./tools_common.h"
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#include "vpx/svc_context.h"
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#include "vpx/vp8cx.h"
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#include "vpx/vpx_encoder.h"
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static const struct arg_enum_list encoding_mode_enum[] = {
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{"i", INTER_LAYER_PREDICTION_I},
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{"alt-ip", ALT_INTER_LAYER_PREDICTION_IP},
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{"ip", INTER_LAYER_PREDICTION_IP},
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{"gf", USE_GOLDEN_FRAME},
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{NULL, 0}
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};
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static const arg_def_t encoding_mode_arg = ARG_DEF_ENUM(
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"m", "encoding-mode", 1, "Encoding mode algorithm", encoding_mode_enum);
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static const arg_def_t skip_frames_arg =
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ARG_DEF("s", "skip-frames", 1, "input frames to skip");
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static const arg_def_t frames_arg =
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ARG_DEF("f", "frames", 1, "number of frames to encode");
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static const arg_def_t width_arg = ARG_DEF("w", "width", 1, "source width");
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static const arg_def_t height_arg = ARG_DEF("h", "height", 1, "source height");
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static const arg_def_t timebase_arg =
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ARG_DEF("t", "timebase", 1, "timebase (num/den)");
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static const arg_def_t bitrate_arg = ARG_DEF(
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"b", "target-bitrate", 1, "encoding bitrate, in kilobits per second");
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static const arg_def_t layers_arg =
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ARG_DEF("l", "layers", 1, "number of SVC layers");
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static const arg_def_t kf_dist_arg =
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ARG_DEF("k", "kf-dist", 1, "number of frames between keyframes");
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static const arg_def_t scale_factors_arg =
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ARG_DEF("r", "scale-factors", 1, "scale factors (lowest to highest layer)");
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static const arg_def_t quantizers_arg =
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ARG_DEF("q", "quantizers", 1, "quantizers (lowest to highest layer)");
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static const arg_def_t *svc_args[] = {
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&encoding_mode_arg, &frames_arg, &width_arg, &height_arg,
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&timebase_arg, &bitrate_arg, &skip_frames_arg, &layers_arg,
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&kf_dist_arg, &scale_factors_arg, &quantizers_arg, NULL
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};
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static const SVC_ENCODING_MODE default_encoding_mode =
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INTER_LAYER_PREDICTION_IP;
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static const uint32_t default_frames_to_skip = 0;
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static const uint32_t default_frames_to_code = 60 * 60;
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static const uint32_t default_width = 1920;
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static const uint32_t default_height = 1080;
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static const uint32_t default_timebase_num = 1;
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static const uint32_t default_timebase_den = 60;
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static const uint32_t default_bitrate = 1000;
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static const uint32_t default_spatial_layers = 5;
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static const uint32_t default_kf_dist = 100;
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typedef struct {
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char *output_filename;
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uint32_t frames_to_code;
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uint32_t frames_to_skip;
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struct VpxInputContext input_ctx;
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} AppInput;
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static const char *exec_name;
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void usage_exit() {
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fprintf(stderr, "Usage: %s <options> input_filename output_filename\n",
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exec_name);
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fprintf(stderr, "Options:\n");
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arg_show_usage(stderr, svc_args);
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exit(EXIT_FAILURE);
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}
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static void parse_command_line(int argc, const char **argv_,
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AppInput *app_input, SvcContext *svc_ctx,
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vpx_codec_enc_cfg_t *enc_cfg) {
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struct arg arg;
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char **argv, **argi, **argj;
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vpx_codec_err_t res;
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// initialize SvcContext with parameters that will be passed to vpx_svc_init
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svc_ctx->log_level = SVC_LOG_DEBUG;
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svc_ctx->spatial_layers = default_spatial_layers;
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svc_ctx->encoding_mode = default_encoding_mode;
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// start with default encoder configuration
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res = vpx_codec_enc_config_default(vpx_codec_vp9_cx(), enc_cfg, 0);
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if (res) {
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die("Failed to get config: %s\n", vpx_codec_err_to_string(res));
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}
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// update enc_cfg with app default values
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enc_cfg->g_w = default_width;
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enc_cfg->g_h = default_height;
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enc_cfg->g_timebase.num = default_timebase_num;
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enc_cfg->g_timebase.den = default_timebase_den;
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enc_cfg->rc_target_bitrate = default_bitrate;
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enc_cfg->kf_min_dist = default_kf_dist;
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enc_cfg->kf_max_dist = default_kf_dist;
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// initialize AppInput with default values
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app_input->frames_to_code = default_frames_to_code;
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app_input->frames_to_skip = default_frames_to_skip;
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// process command line options
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argv = argv_dup(argc - 1, argv_ + 1);
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for (argi = argj = argv; (*argj = *argi); argi += arg.argv_step) {
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arg.argv_step = 1;
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if (arg_match(&arg, &encoding_mode_arg, argi)) {
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svc_ctx->encoding_mode = arg_parse_enum_or_int(&arg);
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} else if (arg_match(&arg, &frames_arg, argi)) {
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app_input->frames_to_code = arg_parse_uint(&arg);
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} else if (arg_match(&arg, &width_arg, argi)) {
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enc_cfg->g_w = arg_parse_uint(&arg);
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} else if (arg_match(&arg, &height_arg, argi)) {
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enc_cfg->g_h = arg_parse_uint(&arg);
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} else if (arg_match(&arg, &timebase_arg, argi)) {
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enc_cfg->g_timebase = arg_parse_rational(&arg);
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} else if (arg_match(&arg, &bitrate_arg, argi)) {
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enc_cfg->rc_target_bitrate = arg_parse_uint(&arg);
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} else if (arg_match(&arg, &skip_frames_arg, argi)) {
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app_input->frames_to_skip = arg_parse_uint(&arg);
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} else if (arg_match(&arg, &layers_arg, argi)) {
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svc_ctx->spatial_layers = arg_parse_uint(&arg);
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} else if (arg_match(&arg, &kf_dist_arg, argi)) {
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enc_cfg->kf_min_dist = arg_parse_uint(&arg);
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enc_cfg->kf_max_dist = enc_cfg->kf_min_dist;
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} else if (arg_match(&arg, &scale_factors_arg, argi)) {
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vpx_svc_set_scale_factors(svc_ctx, arg.val);
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} else if (arg_match(&arg, &quantizers_arg, argi)) {
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vpx_svc_set_quantizers(svc_ctx, arg.val);
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} else {
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++argj;
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}
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}
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// Check for unrecognized options
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for (argi = argv; *argi; ++argi)
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if (argi[0][0] == '-' && strlen(argi[0]) > 1)
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die("Error: Unrecognized option %s\n", *argi);
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if (argv[0] == NULL || argv[1] == 0) {
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usage_exit();
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}
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app_input->input_ctx.filename = argv[0];
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app_input->output_filename = argv[1];
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free(argv);
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if (enc_cfg->g_w < 16 || enc_cfg->g_w % 2 || enc_cfg->g_h < 16 ||
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enc_cfg->g_h % 2)
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die("Invalid resolution: %d x %d\n", enc_cfg->g_w, enc_cfg->g_h);
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printf(
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"Codec %s\nframes: %d, skip: %d\n"
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"mode: %d, layers: %d\n"
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"width %d, height: %d,\n"
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"num: %d, den: %d, bitrate: %d,\n"
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"gop size: %d\n",
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vpx_codec_iface_name(vpx_codec_vp9_cx()), app_input->frames_to_code,
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app_input->frames_to_skip, svc_ctx->encoding_mode,
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svc_ctx->spatial_layers, enc_cfg->g_w, enc_cfg->g_h,
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enc_cfg->g_timebase.num, enc_cfg->g_timebase.den,
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enc_cfg->rc_target_bitrate, enc_cfg->kf_max_dist);
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}
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int main(int argc, const char **argv) {
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AppInput app_input = {0};
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FILE *outfile;
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vpx_codec_ctx_t codec;
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vpx_codec_enc_cfg_t enc_cfg;
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SvcContext svc_ctx;
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uint32_t i;
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uint32_t frame_cnt = 0;
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vpx_image_t raw;
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vpx_codec_err_t res;
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int pts = 0; /* PTS starts at 0 */
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int frame_duration = 1; /* 1 timebase tick per frame */
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memset(&svc_ctx, 0, sizeof(svc_ctx));
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svc_ctx.log_print = 1;
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exec_name = argv[0];
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parse_command_line(argc, argv, &app_input, &svc_ctx, &enc_cfg);
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// Allocate image buffer
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if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, enc_cfg.g_w, enc_cfg.g_h, 32))
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die("Failed to allocate image %dx%d\n", enc_cfg.g_w, enc_cfg.g_h);
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if (!(app_input.input_ctx.file = fopen(app_input.input_ctx.filename, "rb")))
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die("Failed to open %s for reading\n", app_input.input_ctx.filename);
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if (!(outfile = fopen(app_input.output_filename, "wb")))
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die("Failed to open %s for writing\n", app_input.output_filename);
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// Initialize codec
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if (vpx_svc_init(&svc_ctx, &codec, vpx_codec_vp9_cx(), &enc_cfg) !=
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VPX_CODEC_OK)
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die("Failed to initialize encoder\n");
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ivf_write_file_header(outfile, &enc_cfg, VP9_FOURCC, 0);
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// skip initial frames
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for (i = 0; i < app_input.frames_to_skip; ++i) {
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read_yuv_frame(&app_input.input_ctx, &raw);
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}
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// Encode frames
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while (frame_cnt < app_input.frames_to_code) {
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if (read_yuv_frame(&app_input.input_ctx, &raw)) break;
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res = vpx_svc_encode(&svc_ctx, &codec, &raw, pts, frame_duration,
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VPX_DL_REALTIME);
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printf("%s", vpx_svc_get_message(&svc_ctx));
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if (res != VPX_CODEC_OK) {
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die_codec(&codec, "Failed to encode frame");
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}
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if (vpx_svc_get_frame_size(&svc_ctx) > 0) {
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ivf_write_frame_header(outfile, pts, vpx_svc_get_frame_size(&svc_ctx));
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(void)fwrite(vpx_svc_get_buffer(&svc_ctx), 1,
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vpx_svc_get_frame_size(&svc_ctx), outfile);
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}
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++frame_cnt;
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pts += frame_duration;
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}
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printf("Processed %d frames\n", frame_cnt);
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fclose(app_input.input_ctx.file);
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if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
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// rewrite the output file headers with the actual frame count, and
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// resolution of the highest layer
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if (!fseek(outfile, 0, SEEK_SET)) {
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// get resolution of highest layer
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if (VPX_CODEC_OK != vpx_svc_get_layer_resolution(&svc_ctx,
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svc_ctx.spatial_layers - 1,
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&enc_cfg.g_w,
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&enc_cfg.g_h)) {
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die("Failed to get output resolution");
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}
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ivf_write_file_header(outfile, &enc_cfg, VP9_FOURCC, frame_cnt);
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}
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fclose(outfile);
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vpx_img_free(&raw);
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// display average size, psnr
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printf("%s", vpx_svc_dump_statistics(&svc_ctx));
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vpx_svc_release(&svc_ctx);
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return EXIT_SUCCESS;
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}
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