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Diffstat (limited to 'media/libvpx/libvpx/examples/vp8cx_set_ref.c')
-rw-r--r-- | media/libvpx/libvpx/examples/vp8cx_set_ref.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/examples/vp8cx_set_ref.c b/media/libvpx/libvpx/examples/vp8cx_set_ref.c new file mode 100644 index 0000000000..ca528f9e90 --- /dev/null +++ b/media/libvpx/libvpx/examples/vp8cx_set_ref.c @@ -0,0 +1,187 @@ +/* + * 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. + */ + +// VP8 Set Reference Frame +// ======================= +// +// This is an example demonstrating how to overwrite the VP8 encoder's +// internal reference frame. In the sample we set the last frame to the +// current frame. If this is done at a cut scene it will avoid a keyframe. +// This technique could be used to bounce between two cameras. +// +// Note that the decoder would also have to set the reference frame to the +// same value on the same frame, or the video will become corrupt. +// +// Usage +// ----- +// This example adds a single argument to the `simple_encoder` example, +// which specifies the frame number to update the reference frame on. +// The parameter is parsed as follows: +// +// +// Extra Variables +// --------------- +// This example maintains the frame number passed on the command line +// in the `update_frame_num` variable. +// +// +// Configuration +// ------------- +// +// The reference frame is updated on the frame specified on the command +// line. +// +// Observing The Effects +// --------------------- +// Use the `simple_encoder` example to encode a sample with a cut scene. +// Determine the frame number of the cut scene by looking for a generated +// key-frame (indicated by a 'K'). Supply that frame number as an argument +// to this example, and observe that no key-frame is generated. + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "vpx/vp8cx.h" +#include "vpx/vpx_encoder.h" +#include "vp8/common/common.h" + +#include "../tools_common.h" +#include "../video_writer.h" + +static const char *exec_name; + +void usage_exit(void) { + fprintf(stderr, "Usage: %s <width> <height> <infile> <outfile> <frame>\n", + exec_name); + exit(EXIT_FAILURE); +} + +static int encode_frame(vpx_codec_ctx_t *codec, vpx_image_t *img, + int frame_index, 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(codec, img, frame_index, 1, 0, VPX_DL_GOOD_QUALITY); + if (res != VPX_CODEC_OK) die_codec(codec, "Failed to encode frame"); + + while ((pkt = vpx_codec_get_cx_data(codec, &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(codec, "Failed to write compressed frame"); + } + + printf(keyframe ? "K" : "."); + fflush(stdout); + } + } + + return got_pkts; +} + +int main(int argc, char **argv) { + FILE *infile = NULL; + vpx_codec_ctx_t codec; + vpx_codec_enc_cfg_t cfg; + int frame_count = 0; + vpx_image_t raw; + vpx_codec_err_t res; + VpxVideoInfo info; + VpxVideoWriter *writer = NULL; + const VpxInterface *encoder = NULL; + int update_frame_num = 0; + const int fps = 30; // TODO(dkovalev) add command line argument + const int bitrate = 200; // kbit/s TODO(dkovalev) add command line argument + + vp8_zero(codec); + vp8_zero(cfg); + vp8_zero(info); + + exec_name = argv[0]; + + if (argc != 6) die("Invalid number of arguments"); + + // TODO(dkovalev): add vp9 support and rename the file accordingly + encoder = get_vpx_encoder_by_name("vp8"); + if (!encoder) die("Unsupported codec."); + + update_frame_num = atoi(argv[5]); + if (!update_frame_num) die("Couldn't parse frame number '%s'\n", argv[5]); + + info.codec_fourcc = encoder->fourcc; + info.frame_width = (int)strtol(argv[1], NULL, 0); + info.frame_height = (int)strtol(argv[2], NULL, 0); + info.time_base.numerator = 1; + info.time_base.denominator = fps; + + if (info.frame_width <= 0 || info.frame_height <= 0 || + (info.frame_width % 2) != 0 || (info.frame_height % 2) != 0) { + die("Invalid frame size: %dx%d", info.frame_width, info.frame_height); + } + + if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, info.frame_width, + info.frame_height, 1)) { + die("Failed to allocate image."); + } + + printf("Using %s\n", vpx_codec_iface_name(encoder->codec_interface())); + + 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 = info.frame_width; + cfg.g_h = info.frame_height; + cfg.g_timebase.num = info.time_base.numerator; + cfg.g_timebase.den = info.time_base.denominator; + cfg.rc_target_bitrate = bitrate; + + writer = vpx_video_writer_open(argv[4], kContainerIVF, &info); + if (!writer) die("Failed to open %s for writing.", argv[4]); + + if (!(infile = fopen(argv[3], "rb"))) + die("Failed to open %s for reading.", argv[3]); + + if (vpx_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0)) + die("Failed to initialize encoder"); + + // Encode frames. + while (vpx_img_read(&raw, infile)) { + if (frame_count + 1 == update_frame_num) { + vpx_ref_frame_t ref; + ref.frame_type = VP8_LAST_FRAME; + ref.img = raw; + if (vpx_codec_control(&codec, VP8_SET_REFERENCE, &ref)) + die_codec(&codec, "Failed to set reference frame"); + } + + encode_frame(&codec, &raw, frame_count++, writer); + } + + // Flush encoder. + while (encode_frame(&codec, NULL, -1, writer)) { + } + + printf("\n"); + fclose(infile); + printf("Processed %d frames.\n", frame_count); + + vpx_img_free(&raw); + if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec."); + + vpx_video_writer_close(writer); + + return EXIT_SUCCESS; +} |