/*
* Copyright (c) 2013-2018 Andreas Unterweger
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Simple audio converter
*
* @example transcode_aac.c
* Convert an input audio file to AAC in an MP4 container using FFmpeg.
* Formats other than MP4 are supported based on the output file extension.
* @author Andreas Unterweger (dustsigns@gmail.com)
*/
#include <stdio.h>
#include "libavformat/avformat.h"
#include "libavformat/avio.h"
#include "libavcodec/avcodec.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/frame.h"
#include "libavutil/opt.h"
#include "libswresample/swresample.h"
/* The output bit rate in bit/s */
#define OUTPUT_BIT_RATE 96000
/* The number of output channels */
#define OUTPUT_CHANNELS 2
/**
* Open an input file and the required decoder.
* @param filename File to be opened
* @param[out] input_format_context Format context of opened file
* @param[out] input_codec_context Codec context of opened file
* @return Error code (0 if successful)
*/
static int open_input_file(const char *filename,
AVFormatContext **input_format_context,
AVCodecContext **input_codec_context)
{
AVCodecContext *avctx;
AVCodec *input_codec;
int error;
/* Open the input file to read from it. */
if ((error = avformat_open_input(input_format_context, filename, NULL,
NULL)) < 0) {
fprintf(stderr, "Could not open input file '%s' (error '%s')\n",
filename, av_err2str(error));
*input_format_context = NULL;
return error;
}
/* Get information on the input file (number of streams etc.). */
if ((error = avformat_find_stream_info(*input_format_context, NULL)) < 0) {
fprintf(stderr, "Could not open find stream info (error '%s')\n",
av_err2str(error));
avformat_close_input(input_format_context);
return error;
}
/* Make sure that there is only one stream in the input file. */
if ((*input_format_context)->nb_streams != 1) {
fprintf(stderr, "Expected one audio input stream, but found %d\n",
(*input_format_context)->nb_streams);
avformat_close_input(input_format_context);
return AVERROR_EXIT;
}
/* Find a decoder for the audio stream. */
if (!(input_codec = avcodec_find_decoder((*input_format_context)->streams[0]->codecpar->codec_id))) {
fprintf(stderr, "Could not find input codec\n");
avformat_close_input(input_format_context);
return AVERROR_EXIT;
}
/* Allocate a new decoding context. */
avctx = avcodec_alloc_context3(input_codec);
if (!avctx) {
fprintf(stderr, "Could not allocate a decoding context\n");
avformat_close_input(input_format_context);
return AVERROR(ENOMEM);
}
/* Initialize the stream parameters with demuxer information. */
error = avcodec_parameters_to_context(avctx, (*input_format_context)->streams[0]->codecpar);
if (error < 0) {
avformat_close_input(input_format_context);
avcodec_free_context(&avctx);
return error;
}
/* Open the decoder for the audio stream to use it later. */
if ((error = avcodec_open2(avctx, input_codec, NULL)) < 0) {
fprintf(stderr, "Could not open input codec (error '%s')\n",
av_err2str(error));
avcodec_free_context(&avctx);
avformat_close_input(input_format_context);
return error;
}
/* Save the decoder context for easier access later. */
*input_codec_context = avctx;
return 0;
}
/**
* Open an output file and the required encoder.
* Also set some basic encoder parameters.
* Some of these parameters are based on the input file's parameters.
* @param filename File to be opened
* @param input_codec_context Codec context of input file
* @param[out] output_format_context Format context of output file
* @param[out] output_codec_context Codec context of output file
* @return Error code (0 if successful)
*/
static int open_output_file(const char *filename,
AVCodecContext *input_codec_context,
AVFormatContext **output_format_context,
AVCodecContext **output_codec_context)
{
AVCodecContext *avctx = NULL;
AVIOContext *output_io_context = NULL;
AVStream *stream = NULL;
AVCodec *output_codec = NULL;
int error;
/* Open the output file to write to it. */
if ((error = avio_open(&output_io_context, filename,
AVIO_FLAG_WRITE)) < 0) {
fprintf(stderr, "Could not open output file '%s' (error '%s')\n",
filename, av_err2str(error));
return error;
}
/* Create a new format context for the output container format. */
if (!(*output_format_context = avformat_alloc_context())) {
fprintf(stderr, "Could not allocate output format context\n");
return AVERROR(ENOMEM);
}
/* Associate the output file (pointer) with the container format context. */
(*output_format_context)->pb = output_io_context;
/* Guess the desired container format based on the file extension. */
if (!((*output_format_context)->oformat = av_guess_format(NULL, filename,
NULL))) {
fprintf(stderr, "Could not find output file format\n");
goto cleanup;
}
if (!((*output_format_context)->url = av_strdup(filename))) {
fprintf(stderr, "Could not allocate url.\n");
error = AVERROR(ENOMEM);
goto cleanup;
}
/* Find the encoder to be used by its name. */
if (!(output_codec = avcodec_find_encoder(AV_CODEC_ID_AAC))) {
fprintf(stderr, "Could not find an AAC encoder.\n");
goto cleanup;
}
/* Create a new audio stream in the output file container. */
if (!(stream = avformat_new_stream(*output_format_context, NULL))) {
fprintf(stderr, "Could not create new stream\n");
error = AVERROR(ENOMEM);
goto cleanup;
}
avctx = avcodec_alloc_context3(output_codec);
if (!avctx) {
fprintf(stderr, "Could not allocate an encoding context\n");
error = AVERROR(ENOMEM);
goto cleanup;
}
/* Set the basic encoder parameters.
* The input file's sample rate is used to avoid a sample rate conversion. */
avctx->channels = OUTPUT_CHANNELS;
avctx->channel_layout = av_get_default_channel_layout(OUTPUT_CHANNELS);
avctx->sample_rate = input_codec_context->sample_rate;
avctx->sample_fmt = output_codec->sample_fmts[0];
avctx->bit_rate = OUTPUT_BIT_RATE;
/* Allow the use of the experimental AAC encoder. */
avctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
/* Set the sample rate for the container. */
stream->time_base.den = input_codec_context->sample_rate;
stream->time_base.num = 1;
/* Some container formats (like MP4) require global headers to be present.
* Mark the encoder so that it behaves accordingly.
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ffmpeg_4.4_mingw32_release.zip (248个子文件)
ffmpeg-all.1 1.67MB
ffprobe-all.1 1.34MB
ffmpeg-filters.1 872KB
ffmpeg-codecs.1 189KB
ffmpeg-formats.1 166KB
ffmpeg.1 118KB
ffmpeg-devices.1 76KB
ffmpeg-protocols.1 73KB
ffprobe.1 42KB
ffmpeg-utils.1 36KB
ffmpeg-bitstream-filters.1 33KB
ffmpeg-resampler.1 14KB
ffmpeg-scaler.1 9KB
libswresample.3 6KB
libswscale.3 5KB
libavutil.3 5KB
libavcodec.3 5KB
libavformat.3 5KB
libavdevice.3 5KB
libavfilter.3 5KB
libavutil.dll.a 343KB
libavcodec.dll.a 152KB
libavformat.dll.a 111KB
libavfilter.dll.a 44KB
libswscale.dll.a 22KB
libswresample.dll.a 15KB
libavdevice.dll.a 13KB
libpostproc.dll.a 7KB
transcode_aac.c 34KB
transcoding.c 21KB
muxing.c 21KB
demuxing_decoding.c 13KB
filter_audio.c 12KB
filtering_audio.c 10KB
vaapi_transcode.c 10KB
filtering_video.c 9KB
qsvdec.c 8KB
resampling_audio.c 8KB
hw_decode.c 8KB
decode_audio.c 7KB
vaapi_encode.c 7KB
encode_audio.c 6KB
remuxing.c 6KB
extract_mvs.c 6KB
encode_video.c 5KB
decode_video.c 5KB
http_multiclient.c 5KB
scaling_video.c 5KB
avio_list_dir.c 4KB
avio_reading.c 4KB
metadata.c 2KB
avutil-56.def 13KB
avcodec-58.def 6KB
avformat-58.def 4KB
avfilter-7.def 2KB
swscale-5.def 756B
avdevice-58.def 544B
swresample-3.def 473B
postproc-55.def 223B
avcodec-58.dll 12.43MB
avfilter-7.dll 3.22MB
avformat-58.dll 2.15MB
libx264-164.dll 1.79MB
avutil-56.dll 643KB
swscale-5.dll 576KB
postproc-55.dll 175KB
swresample-3.dll 110KB
avdevice-58.dll 30KB
ffmpeg.exe 236KB
ffprobe.exe 148KB
libvpx-1080p50_60.ffpreset 227B
libvpx-720p50_60.ffpreset 227B
libvpx-720p.ffpreset 227B
libvpx-1080p.ffpreset 227B
libvpx-360p.ffpreset 219B
avcodec.h 145KB
avformat.h 113KB
avfilter.h 41KB
opt.h 36KB
pixfmt.h 36KB
frame.h 32KB
avio.h 32KB
hwcontext.h 24KB
mem.h 23KB
packet.h 23KB
swresample.h 21KB
intreadwrite.h 18KB
common.h 18KB
avdevice.h 18KB
codec.h 17KB
pixdesc.h 16KB
codec_id.h 15KB
avstring.h 15KB
log.h 13KB
hdr_dynamic_metadata.h 12KB
imgutils.h 12KB
swscale.h 12KB
buffer.h 12KB
bsf.h 11KB
channel_layout.h 10KB
共 248 条
- 1
- 2
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