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Diffstat (limited to 'media/libaom/src/examples/twopass_encoder.c')
| -rw-r--r-- | media/libaom/src/examples/twopass_encoder.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/media/libaom/src/examples/twopass_encoder.c b/media/libaom/src/examples/twopass_encoder.c new file mode 100644 index 000000000..a03bc6cc2 --- /dev/null +++ b/media/libaom/src/examples/twopass_encoder.c @@ -0,0 +1,250 @@ +/* + * Copyright (c) 2016, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ + +// Two Pass Encoder +// ================ +// +// This is an example of a two pass encoder loop. It takes an input file in +// YV12 format, passes it through the encoder twice, and writes the compressed +// frames to disk in IVF format. It builds upon the simple_encoder example. +// +// Twopass Variables +// ----------------- +// Twopass mode needs to track the current pass number and the buffer of +// statistics packets. +// +// Updating The Configuration +// --------------------------------- +// In two pass mode, the configuration has to be updated on each pass. The +// statistics buffer is passed on the last pass. +// +// Encoding A Frame +// ---------------- +// Encoding a frame in two pass mode is identical to the simple encoder +// example. +// +// Processing Statistics Packets +// ----------------------------- +// Each packet of type `AOM_CODEC_CX_FRAME_PKT` contains the encoded data +// for this frame. We write a IVF frame header, followed by the raw data. +// +// +// Pass Progress Reporting +// ----------------------------- +// It's sometimes helpful to see when each pass completes. +// +// +// Clean-up +// ----------------------------- +// Destruction of the encoder instance must be done on each pass. The +// raw image should be destroyed at the end as usual. + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "aom/aom_encoder.h" +#include "common/tools_common.h" +#include "common/video_writer.h" + +static const char *exec_name; + +void usage_exit(void) { + fprintf(stderr, + "Usage: %s <codec> <width> <height> <infile> <outfile> " + "<limit(optional)>\n", + exec_name); + exit(EXIT_FAILURE); +} + +static int get_frame_stats(aom_codec_ctx_t *ctx, const aom_image_t *img, + aom_codec_pts_t pts, unsigned int duration, + aom_enc_frame_flags_t flags, + aom_fixed_buf_t *stats) { + int got_pkts = 0; + aom_codec_iter_t iter = NULL; + const aom_codec_cx_pkt_t *pkt = NULL; + const aom_codec_err_t res = aom_codec_encode(ctx, img, pts, duration, flags); + if (res != AOM_CODEC_OK) die_codec(ctx, "Failed to get frame stats."); + + while ((pkt = aom_codec_get_cx_data(ctx, &iter)) != NULL) { + got_pkts = 1; + + if (pkt->kind == AOM_CODEC_STATS_PKT) { + const uint8_t *const pkt_buf = pkt->data.twopass_stats.buf; + const size_t pkt_size = pkt->data.twopass_stats.sz; + stats->buf = realloc(stats->buf, stats->sz + pkt_size); + memcpy((uint8_t *)stats->buf + stats->sz, pkt_buf, pkt_size); + stats->sz += pkt_size; + } + } + + return got_pkts; +} + +static int encode_frame(aom_codec_ctx_t *ctx, const aom_image_t *img, + aom_codec_pts_t pts, unsigned int duration, + aom_enc_frame_flags_t flags, AvxVideoWriter *writer) { + int got_pkts = 0; + aom_codec_iter_t iter = NULL; + const aom_codec_cx_pkt_t *pkt = NULL; + const aom_codec_err_t res = aom_codec_encode(ctx, img, pts, duration, flags); + if (res != AOM_CODEC_OK) die_codec(ctx, "Failed to encode frame."); + + while ((pkt = aom_codec_get_cx_data(ctx, &iter)) != NULL) { + got_pkts = 1; + if (pkt->kind == AOM_CODEC_CX_FRAME_PKT) { + const int keyframe = (pkt->data.frame.flags & AOM_FRAME_IS_KEY) != 0; + + if (!aom_video_writer_write_frame(writer, pkt->data.frame.buf, + pkt->data.frame.sz, + pkt->data.frame.pts)) + die_codec(ctx, "Failed to write compressed frame."); + printf(keyframe ? "K" : "."); + fflush(stdout); + } + } + + return got_pkts; +} + +static aom_fixed_buf_t pass0(aom_image_t *raw, FILE *infile, + const AvxInterface *encoder, + const aom_codec_enc_cfg_t *cfg, int limit) { + aom_codec_ctx_t codec; + int frame_count = 0; + aom_fixed_buf_t stats = { NULL, 0 }; + + if (aom_codec_enc_init(&codec, encoder->codec_interface(), cfg, 0)) + die_codec(&codec, "Failed to initialize encoder"); + + // Calculate frame statistics. + while (aom_img_read(raw, infile) && frame_count < limit) { + ++frame_count; + get_frame_stats(&codec, raw, frame_count, 1, 0, &stats); + } + + // Flush encoder. + while (get_frame_stats(&codec, NULL, frame_count, 1, 0, &stats)) { + } + + printf("Pass 0 complete. Processed %d frames.\n", frame_count); + if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec."); + + return stats; +} + +static void pass1(aom_image_t *raw, FILE *infile, const char *outfile_name, + const AvxInterface *encoder, const aom_codec_enc_cfg_t *cfg, + int limit) { + AvxVideoInfo info = { encoder->fourcc, + cfg->g_w, + cfg->g_h, + { cfg->g_timebase.num, cfg->g_timebase.den }, + 0 }; + AvxVideoWriter *writer = NULL; + aom_codec_ctx_t codec; + int frame_count = 0; + + writer = aom_video_writer_open(outfile_name, kContainerIVF, &info); + if (!writer) die("Failed to open %s for writing", outfile_name); + + if (aom_codec_enc_init(&codec, encoder->codec_interface(), cfg, 0)) + die_codec(&codec, "Failed to initialize encoder"); + + // Encode frames. + while (aom_img_read(raw, infile) && frame_count < limit) { + ++frame_count; + encode_frame(&codec, raw, frame_count, 1, 0, writer); + } + + // Flush encoder. + while (encode_frame(&codec, NULL, -1, 1, 0, writer)) { + } + + printf("\n"); + + if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec."); + + aom_video_writer_close(writer); + + printf("Pass 1 complete. Processed %d frames.\n", frame_count); +} + +int main(int argc, char **argv) { + FILE *infile = NULL; + int w, h; + aom_codec_ctx_t codec; + aom_codec_enc_cfg_t cfg; + aom_image_t raw; + aom_codec_err_t res; + aom_fixed_buf_t stats; + + const AvxInterface *encoder = NULL; + const int fps = 30; // TODO(dkovalev) add command line argument + const int bitrate = 200; // kbit/s TODO(dkovalev) add command line argument + const char *const codec_arg = argv[1]; + const char *const width_arg = argv[2]; + const char *const height_arg = argv[3]; + const char *const infile_arg = argv[4]; + const char *const outfile_arg = argv[5]; + int limit = 0; + exec_name = argv[0]; + + if (argc < 6) die("Invalid number of arguments"); + + if (argc > 6) limit = (int)strtol(argv[6], NULL, 0); + + if (limit == 0) limit = 100; + + encoder = get_aom_encoder_by_name(codec_arg); + if (!encoder) die("Unsupported codec."); + + w = (int)strtol(width_arg, NULL, 0); + h = (int)strtol(height_arg, NULL, 0); + + if (w <= 0 || h <= 0 || (w % 2) != 0 || (h % 2) != 0) + die("Invalid frame size: %dx%d", w, h); + + if (!aom_img_alloc(&raw, AOM_IMG_FMT_I420, w, h, 1)) + die("Failed to allocate image", w, h); + + printf("Using %s\n", aom_codec_iface_name(encoder->codec_interface())); + + // Configuration + res = aom_codec_enc_config_default(encoder->codec_interface(), &cfg, 0); + if (res) die_codec(&codec, "Failed to get default codec config."); + + cfg.g_w = w; + cfg.g_h = h; + cfg.g_timebase.num = 1; + cfg.g_timebase.den = fps; + cfg.rc_target_bitrate = bitrate; + + if (!(infile = fopen(infile_arg, "rb"))) + die("Failed to open %s for reading", infile_arg); + + // Pass 0 + cfg.g_pass = AOM_RC_FIRST_PASS; + stats = pass0(&raw, infile, encoder, &cfg, limit); + + // Pass 1 + rewind(infile); + cfg.g_pass = AOM_RC_LAST_PASS; + cfg.rc_twopass_stats_in = stats; + pass1(&raw, infile, outfile_arg, encoder, &cfg, limit); + free(stats.buf); + + aom_img_free(&raw); + fclose(infile); + + return EXIT_SUCCESS; +} |