mirror of
https://git.ffmpeg.org/ffmpeg.git
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79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* Print encoder properties (bit_rate, block_align, bits_per_coded_sample,
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* frame_size) after init.
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* Useful for verifying that encoders correctly set their codec parameters.
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*
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* Usage: encinfo <codec_name> [sample_rate] [channels]
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "libavcodec/avcodec.h"
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#include "libavutil/channel_layout.h"
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int main(int argc, char **argv)
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{
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const AVCodec *codec;
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AVCodecContext *ctx;
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int sample_rate = 44100;
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int channels = 2;
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int ret;
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if (argc < 2) {
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fprintf(stderr, "Usage: %s <codec_name> [sample_rate] [channels]\n",
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argv[0]);
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return 1;
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}
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if (argc >= 3)
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sample_rate = atoi(argv[2]);
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if (argc >= 4)
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channels = atoi(argv[3]);
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codec = avcodec_find_encoder_by_name(argv[1]);
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if (!codec) {
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fprintf(stderr, "Encoder '%s' not found\n", argv[1]);
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return 1;
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}
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ctx = avcodec_alloc_context3(codec);
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if (!ctx)
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return AVERROR(ENOMEM);
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ctx->sample_rate = sample_rate;
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ctx->sample_fmt = codec->sample_fmts ? codec->sample_fmts[0] : AV_SAMPLE_FMT_S16;
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av_channel_layout_default(&ctx->ch_layout, channels);
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ret = avcodec_open2(ctx, codec, NULL);
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if (ret < 0) {
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fprintf(stderr, "avcodec_open2 failed: %d\n", ret);
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avcodec_free_context(&ctx);
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return 1;
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}
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printf("%s bit_rate=%"PRId64" block_align=%d bits_per_coded_sample=%d frame_size=%d\n",
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codec->name, ctx->bit_rate, ctx->block_align,
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ctx->bits_per_coded_sample, ctx->frame_size);
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avcodec_free_context(&ctx);
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return 0;
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}
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