vp9_lossless_encoder

00001 /*
00002  *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
00003  *
00004  *  Use of this source code is governed by a BSD-style license
00005  *  that can be found in the LICENSE file in the root of the source
00006  *  tree. An additional intellectual property rights grant can be found
00007  *  in the file PATENTS.  All contributing project authors may
00008  *  be found in the AUTHORS file in the root of the source tree.
00009  */
00010 
00011 #include <stdio.h>
00012 #include <stdlib.h>
00013 #include <string.h>
00014 
00015 #include "vpx/vpx_encoder.h"
00016 #include "vpx/vp8cx.h"
00017 #include "vp9/common/vp9_common.h"
00018 
00019 #include "../tools_common.h"
00020 #include "../video_writer.h"
00021 
00022 static const char *exec_name;
00023 
00024 void usage_exit(void) {
00025   fprintf(stderr,
00026           "vp9_lossless_encoder: Example demonstrating VP9 lossless "
00027           "encoding feature. Supports raw input only.\n");
00028   fprintf(stderr, "Usage: %s <width> <height> <infile> <outfile>\n", exec_name);
00029   exit(EXIT_FAILURE);
00030 }
00031 
00032 static int encode_frame(vpx_codec_ctx_t *codec, vpx_image_t *img,
00033                         int frame_index, int flags, VpxVideoWriter *writer) {
00034   int got_pkts = 0;
00035   vpx_codec_iter_t iter = NULL;
00036   const vpx_codec_cx_pkt_t *pkt = NULL;
00037   const vpx_codec_err_t res =
00038       vpx_codec_encode(codec, img, frame_index, 1, flags, VPX_DL_GOOD_QUALITY);
00039   if (res != VPX_CODEC_OK) die_codec(codec, "Failed to encode frame");
00040 
00041   while ((pkt = vpx_codec_get_cx_data(codec, &iter)) != NULL) {
00042     got_pkts = 1;
00043 
00044     if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
00045       const int keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
00046       if (!vpx_video_writer_write_frame(writer, pkt->data.frame.buf,
00047                                         pkt->data.frame.sz,
00048                                         pkt->data.frame.pts)) {
00049         die_codec(codec, "Failed to write compressed frame");
00050       }
00051       printf(keyframe ? "K" : ".");
00052       fflush(stdout);
00053     }
00054   }
00055 
00056   return got_pkts;
00057 }
00058 
00059 int main(int argc, char **argv) {
00060   FILE *infile = NULL;
00061   vpx_codec_ctx_t codec;
00062   vpx_codec_enc_cfg_t cfg;
00063   int frame_count = 0;
00064   vpx_image_t raw;
00065   vpx_codec_err_t res;
00066   VpxVideoInfo info;
00067   VpxVideoWriter *writer = NULL;
00068   const VpxInterface *encoder = NULL;
00069   const int fps = 30;
00070 
00071   vp9_zero(info);
00072 
00073   exec_name = argv[0];
00074 
00075   if (argc < 5) die("Invalid number of arguments");
00076 
00077   encoder = get_vpx_encoder_by_name("vp9");
00078   if (!encoder) die("Unsupported codec.");
00079 
00080   info.codec_fourcc = encoder->fourcc;
00081   info.frame_width = (int)strtol(argv[1], NULL, 0);
00082   info.frame_height = (int)strtol(argv[2], NULL, 0);
00083   info.time_base.numerator = 1;
00084   info.time_base.denominator = fps;
00085 
00086   if (info.frame_width <= 0 || info.frame_height <= 0 ||
00087       (info.frame_width % 2) != 0 || (info.frame_height % 2) != 0) {
00088     die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
00089   }
00090 
00091   if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, info.frame_width,
00092                      info.frame_height, 1)) {
00093     die("Failed to allocate image.");
00094   }
00095 
00096   printf("Using %s\n", vpx_codec_iface_name(encoder->codec_interface()));
00097 
00098   res = vpx_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
00099   if (res) die_codec(&codec, "Failed to get default codec config.");
00100 
00101   cfg.g_w = info.frame_width;
00102   cfg.g_h = info.frame_height;
00103   cfg.g_timebase.num = info.time_base.numerator;
00104   cfg.g_timebase.den = info.time_base.denominator;
00105 
00106   writer = vpx_video_writer_open(argv[4], kContainerIVF, &info);
00107   if (!writer) die("Failed to open %s for writing.", argv[4]);
00108 
00109   if (!(infile = fopen(argv[3], "rb")))
00110     die("Failed to open %s for reading.", argv[3]);
00111 
00112   if (vpx_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
00113     die_codec(&codec, "Failed to initialize encoder");
00114 
00115   if (vpx_codec_control_(&codec, VP9E_SET_LOSSLESS, 1))
00116     die_codec(&codec, "Failed to use lossless mode");
00117 
00118   // Encode frames.
00119   while (vpx_img_read(&raw, infile)) {
00120     encode_frame(&codec, &raw, frame_count++, 0, writer);
00121   }
00122 
00123   // Flush encoder.
00124   while (encode_frame(&codec, NULL, -1, 0, writer)) {
00125   }
00126 
00127   printf("\n");
00128   fclose(infile);
00129   printf("Processed %d frames.\n", frame_count);
00130 
00131   vpx_img_free(&raw);
00132   if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
00133 
00134   vpx_video_writer_close(writer);
00135 
00136   return EXIT_SUCCESS;
00137 }

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