f332c6305e
Renames interface to codec_interface since it is a reserved word on windows. Change-Id: I84f2cbf257a4c44f16dc2464127e35ee405c2c3e
188 lines
5.8 KiB
C
188 lines
5.8 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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// VP8 Set Reference Frame
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// =======================
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//
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// This is an example demonstrating how to overwrite the VP8 encoder's
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// internal reference frame. In the sample we set the last frame to the
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// current frame. If this is done at a cut scene it will avoid a keyframe.
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// This technique could be used to bounce between two cameras.
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//
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// Note that the decoder would also have to set the reference frame to the
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// same value on the same frame, or the video will become corrupt.
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//
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// Usage
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// -----
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// This example adds a single argument to the `simple_encoder` example,
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// which specifies the frame number to update the reference frame on.
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// The parameter is parsed as follows:
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//
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//
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// Extra Variables
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// ---------------
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// This example maintains the frame number passed on the command line
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// in the `update_frame_num` variable.
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//
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//
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// Configuration
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// -------------
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//
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// The reference frame is updated on the frame specified on the command
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// line.
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//
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// Observing The Effects
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// ---------------------
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// Use the `simple_encoder` example to encode a sample with a cut scene.
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// Determine the frame number of the cut scene by looking for a generated
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// key-frame (indicated by a 'K'). Supply that frame number as an argument
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// to this example, and observe that no key-frame is generated.
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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/vp8cx.h"
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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 <width> <height> <infile> <outfile> <frame>\n",
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exec_name);
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exit(EXIT_FAILURE);
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}
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static void encode_frame(vpx_codec_ctx_t *codec,
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vpx_image_t *img,
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int frame_index,
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VpxVideoWriter *writer) {
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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(codec, img, frame_index, 1, 0,
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VPX_DL_GOOD_QUALITY);
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if (res != VPX_CODEC_OK)
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die_codec(codec, "Failed to encode frame");
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while ((pkt = vpx_codec_get_cx_data(codec, &iter)) != NULL) {
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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,
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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(codec, "Failed to write compressed frame");
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}
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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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}
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int main(int argc, char **argv) {
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FILE *infile = NULL;
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vpx_codec_ctx_t codec = {0};
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vpx_codec_enc_cfg_t cfg = {0};
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int frame_count = 0;
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vpx_image_t raw;
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vpx_codec_err_t res;
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VpxVideoInfo info = {0};
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VpxVideoWriter *writer = NULL;
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const VpxInterface *encoder = NULL;
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int update_frame_num = 0;
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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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exec_name = argv[0];
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if (argc != 6)
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die("Invalid number of arguments");
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// TODO(dkovalev): add vp9 support and rename the file accordingly
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encoder = get_vpx_encoder_by_name("vp8");
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if (!encoder)
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die("Unsupported codec.");
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update_frame_num = atoi(argv[5]);
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if (!update_frame_num)
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die("Couldn't parse frame number '%s'\n", argv[5]);
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info.codec_fourcc = encoder->fourcc;
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info.frame_width = strtol(argv[1], NULL, 0);
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info.frame_height = strtol(argv[2], NULL, 0);
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info.time_base.numerator = 1;
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info.time_base.denominator = fps;
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if (info.frame_width <= 0 ||
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info.frame_height <= 0 ||
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(info.frame_width % 2) != 0 ||
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(info.frame_height % 2) != 0) {
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die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
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}
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if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, info.frame_width,
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info.frame_height, 1)) {
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die("Failed to allocate image.");
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}
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printf("Using %s\n", vpx_codec_iface_name(encoder->codec_interface()));
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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 = info.frame_width;
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cfg.g_h = info.frame_height;
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cfg.g_timebase.num = info.time_base.numerator;
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cfg.g_timebase.den = info.time_base.denominator;
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cfg.rc_target_bitrate = bitrate;
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writer = vpx_video_writer_open(argv[4], kContainerIVF, &info);
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if (!writer)
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die("Failed to open %s for writing.", argv[4]);
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if (!(infile = fopen(argv[3], "rb")))
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die("Failed to open %s for reading.", argv[3]);
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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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while (vpx_img_read(&raw, infile)) {
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if (frame_count + 1 == update_frame_num) {
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vpx_ref_frame_t ref;
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ref.frame_type = VP8_LAST_FRAME;
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ref.img = raw;
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if (vpx_codec_control(&codec, VP8_SET_REFERENCE, &ref))
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die_codec(&codec, "Failed to set reference frame");
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}
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encode_frame(&codec, &raw, frame_count++, writer);
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}
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encode_frame(&codec, NULL, -1, writer);
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printf("\n");
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fclose(infile);
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printf("Processed %d frames.\n", frame_count);
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vpx_img_free(&raw);
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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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return EXIT_SUCCESS;
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}
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