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Diffstat (limited to 'media/libvpx/libvpx/examples/vp9cx_set_ref.c')
| -rw-r--r-- | media/libvpx/libvpx/examples/vp9cx_set_ref.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/examples/vp9cx_set_ref.c b/media/libvpx/libvpx/examples/vp9cx_set_ref.c new file mode 100644 index 0000000000..1a0823153b --- /dev/null +++ b/media/libvpx/libvpx/examples/vp9cx_set_ref.c @@ -0,0 +1,320 @@ +/* + * Copyright (c) 2016 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. + */ + +// VP9 Set Reference Frame +// ============================ +// +// This is an example demonstrating how to overwrite the VP9 encoder's +// internal reference frame. In the sample we set the last frame to the +// current frame. This technique could be used to bounce between two cameras. +// +// The decoder would also have to set the reference frame to the same value +// on the same frame, or the video will become corrupt. The 'test_decode' +// variable is set to 1 in this example that tests if the encoder and decoder +// results are matching. +// +// Usage +// ----- +// This example encodes a raw video. And the last argument passed in specifies +// the frame number to update the reference frame on. For example, run +// examples/vp9cx_set_ref 352 288 in.yuv out.ivf 4 30 +// 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 +// --------------------- +// The encoder and decoder results should be matching when the same reference +// frame setting operation is done in both encoder and decoder. Otherwise, +// the encoder/decoder mismatch would be seen. + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "vpx/vp8cx.h" +#include "vpx/vpx_decoder.h" +#include "vpx/vpx_encoder.h" +#include "vp9/common/vp9_common.h" + +#include "./tools_common.h" +#include "./video_writer.h" + +static const char *exec_name; + +void usage_exit() { + fprintf(stderr, + "Usage: %s <width> <height> <infile> <outfile> " + "<frame> <limit(optional)>\n", + exec_name); + exit(EXIT_FAILURE); +} + +static void testing_decode(vpx_codec_ctx_t *encoder, vpx_codec_ctx_t *decoder, + unsigned int frame_out, int *mismatch_seen) { + vpx_image_t enc_img, dec_img; + struct vp9_ref_frame ref_enc, ref_dec; + + if (*mismatch_seen) return; + + ref_enc.idx = 0; + ref_dec.idx = 0; + if (vpx_codec_control(encoder, VP9_GET_REFERENCE, &ref_enc)) + die_codec(encoder, "Failed to get encoder reference frame"); + enc_img = ref_enc.img; + if (vpx_codec_control(decoder, VP9_GET_REFERENCE, &ref_dec)) + die_codec(decoder, "Failed to get decoder reference frame"); + dec_img = ref_dec.img; + + if (!compare_img(&enc_img, &dec_img)) { + int y[4], u[4], v[4]; + + *mismatch_seen = 1; + + find_mismatch(&enc_img, &dec_img, y, u, v); + printf( + "Encode/decode mismatch on frame %d at" + " Y[%d, %d] {%d/%d}," + " U[%d, %d] {%d/%d}," + " V[%d, %d] {%d/%d}", + frame_out, y[0], y[1], y[2], y[3], u[0], u[1], u[2], u[3], v[0], v[1], + v[2], v[3]); + } + + vpx_img_free(&enc_img); + vpx_img_free(&dec_img); +} + +static int encode_frame(vpx_codec_ctx_t *ecodec, vpx_image_t *img, + unsigned int frame_in, VpxVideoWriter *writer, + int test_decode, vpx_codec_ctx_t *dcodec, + unsigned int *frame_out, int *mismatch_seen) { + int got_pkts = 0; + vpx_codec_iter_t iter = NULL; + const vpx_codec_cx_pkt_t *pkt = NULL; + int got_data; + const vpx_codec_err_t res = + vpx_codec_encode(ecodec, img, frame_in, 1, 0, VPX_DL_GOOD_QUALITY); + if (res != VPX_CODEC_OK) die_codec(ecodec, "Failed to encode frame"); + + got_data = 0; + + while ((pkt = vpx_codec_get_cx_data(ecodec, &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 (!(pkt->data.frame.flags & VPX_FRAME_IS_FRAGMENT)) { + *frame_out += 1; + } + + if (!vpx_video_writer_write_frame(writer, pkt->data.frame.buf, + pkt->data.frame.sz, + pkt->data.frame.pts)) { + die_codec(ecodec, "Failed to write compressed frame"); + } + printf(keyframe ? "K" : "."); + fflush(stdout); + got_data = 1; + + // Decode 1 frame. + if (test_decode) { + if (vpx_codec_decode(dcodec, pkt->data.frame.buf, + (unsigned int)pkt->data.frame.sz, NULL, 0)) + die_codec(dcodec, "Failed to decode frame."); + } + } + } + + // Mismatch checking + if (got_data && test_decode) { + testing_decode(ecodec, dcodec, *frame_out, mismatch_seen); + } + + return got_pkts; +} + +int main(int argc, char **argv) { + FILE *infile = NULL; + // Encoder + vpx_codec_ctx_t ecodec; + vpx_codec_enc_cfg_t cfg; + unsigned int frame_in = 0; + vpx_image_t raw; + vpx_codec_err_t res; + VpxVideoInfo info; + VpxVideoWriter *writer = NULL; + const VpxInterface *encoder = NULL; + + // Test encoder/decoder mismatch. + int test_decode = 1; + // Decoder + vpx_codec_ctx_t dcodec; + unsigned int frame_out = 0; + + // The frame number to set reference frame on + unsigned int update_frame_num = 0; + int mismatch_seen = 0; + + const int fps = 30; + const int bitrate = 500; + + const char *width_arg = NULL; + const char *height_arg = NULL; + const char *infile_arg = NULL; + const char *outfile_arg = NULL; + const char *update_frame_num_arg = NULL; + unsigned int limit = 0; + + vp9_zero(ecodec); + vp9_zero(cfg); + vp9_zero(info); + + exec_name = argv[0]; + + if (argc < 6) die("Invalid number of arguments"); + + width_arg = argv[1]; + height_arg = argv[2]; + infile_arg = argv[3]; + outfile_arg = argv[4]; + update_frame_num_arg = argv[5]; + + encoder = get_vpx_encoder_by_name("vp9"); + if (!encoder) die("Unsupported codec."); + + update_frame_num = (unsigned int)strtoul(update_frame_num_arg, NULL, 0); + // In VP9, the reference buffers (cm->buffer_pool->frame_bufs[i].buf) are + // allocated while calling vpx_codec_encode(), thus, setting reference for + // 1st frame isn't supported. + if (update_frame_num <= 1) { + die("Couldn't parse frame number '%s'\n", update_frame_num_arg); + } + + if (argc > 6) { + limit = (unsigned int)strtoul(argv[6], NULL, 0); + if (update_frame_num > limit) + die("Update frame number couldn't larger than limit\n"); + } + + info.codec_fourcc = encoder->fourcc; + info.frame_width = (int)strtol(width_arg, NULL, 0); + info.frame_height = (int)strtol(height_arg, 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(&ecodec, "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; + cfg.g_lag_in_frames = 3; + + writer = vpx_video_writer_open(outfile_arg, kContainerIVF, &info); + if (!writer) die("Failed to open %s for writing.", outfile_arg); + + if (!(infile = fopen(infile_arg, "rb"))) + die("Failed to open %s for reading.", infile_arg); + + if (vpx_codec_enc_init(&ecodec, encoder->codec_interface(), &cfg, 0)) + die("Failed to initialize encoder"); + + // Disable alt_ref. + if (vpx_codec_control(&ecodec, VP8E_SET_ENABLEAUTOALTREF, 0)) + die_codec(&ecodec, "Failed to set enable auto alt ref"); + + if (test_decode) { + const VpxInterface *decoder = get_vpx_decoder_by_name("vp9"); + if (vpx_codec_dec_init(&dcodec, decoder->codec_interface(), NULL, 0)) + die_codec(&dcodec, "Failed to initialize decoder."); + } + + // Encode frames. + while (vpx_img_read(&raw, infile)) { + if (limit && frame_in >= limit) break; + if (update_frame_num > 1 && frame_out + 1 == update_frame_num) { + vpx_ref_frame_t ref; + ref.frame_type = VP8_LAST_FRAME; + ref.img = raw; + // Set reference frame in encoder. + if (vpx_codec_control(&ecodec, VP8_SET_REFERENCE, &ref)) + die_codec(&ecodec, "Failed to set reference frame"); + printf(" <SET_REF>"); + + // If set_reference in decoder is commented out, the enc/dec mismatch + // would be seen. + if (test_decode) { + if (vpx_codec_control(&dcodec, VP8_SET_REFERENCE, &ref)) + die_codec(&dcodec, "Failed to set reference frame"); + } + } + + encode_frame(&ecodec, &raw, frame_in, writer, test_decode, &dcodec, + &frame_out, &mismatch_seen); + frame_in++; + if (mismatch_seen) break; + } + + // Flush encoder. + if (!mismatch_seen) + while (encode_frame(&ecodec, NULL, frame_in, writer, test_decode, &dcodec, + &frame_out, &mismatch_seen)) { + } + + printf("\n"); + fclose(infile); + printf("Processed %d frames.\n", frame_out); + + if (test_decode) { + if (!mismatch_seen) + printf("Encoder/decoder results are matching.\n"); + else + printf("Encoder/decoder results are NOT matching.\n"); + } + + if (test_decode) + if (vpx_codec_destroy(&dcodec)) + die_codec(&dcodec, "Failed to destroy decoder"); + + vpx_img_free(&raw); + if (vpx_codec_destroy(&ecodec)) + die_codec(&ecodec, "Failed to destroy encoder."); + + vpx_video_writer_close(writer); + + return EXIT_SUCCESS; +} |