/*
* Copyright (c) 2013-2022 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 audio transcoding to MPEG/AAC API usage example
* @example transcode_aac.c
*
* Convert an input audio file to AAC in an MP4 container. 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/channel_layout.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;
const AVCodec *input_codec;
const AVStream *stream;
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;
}
stream = (*input_format_context)->streams[0];
/* Find a decoder for the audio stream. */
if (!(input_codec = avcodec_find_decoder(stream->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, stream->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;
}
/* Set the packet timebase for the decoder. */
avctx->pkt_timebase = stream->time_base;
/* 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;
const 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. */
av_channel_layout_default(&avctx->ch_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;
/* Set the sample rate for the container. */
stream->time_bas
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Android FFmpeg NDK 25.2.9519653 .so编译库
共646个文件
h:552个
so:32个
pc:32个
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2023-02-15
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Android FFmpeg NDK 25.2.9519653 .so编译库 (646个子文件)
transcode_aac.c 35KB
transcode.c 22KB
mux.c 21KB
qsv_transcode.c 15KB
demux_decode.c 14KB
filter_audio.c 12KB
decode_filter_audio.c 10KB
vaapi_transcode.c 10KB
decode_filter_video.c 10KB
resample_audio.c 8KB
hw_decode.c 8KB
decode_audio.c 7KB
qsv_decode.c 7KB
vaapi_encode.c 7KB
encode_audio.c 7KB
encode_video.c 7KB
remux.c 7KB
extract_mvs.c 6KB
decode_video.c 6KB
avio_http_serve_files.c 5KB
scale_video.c 5KB
avio_list_dir.c 4KB
avio_read_callback.c 4KB
show_metadata.c 2KB
avcodec.h 116KB
avcodec.h 116KB
avcodec.h 116KB
avcodec.h 116KB
avformat.h 110KB
avformat.h 110KB
avformat.h 110KB
avformat.h 110KB
avfilter.h 56KB
avfilter.h 56KB
avfilter.h 56KB
avfilter.h 56KB
pixfmt.h 41KB
pixfmt.h 41KB
pixfmt.h 41KB
pixfmt.h 41KB
opt.h 37KB
opt.h 37KB
opt.h 37KB
opt.h 37KB
channel_layout.h 33KB
channel_layout.h 33KB
channel_layout.h 33KB
channel_layout.h 33KB
frame.h 32KB
frame.h 32KB
frame.h 32KB
frame.h 32KB
avio.h 31KB
avio.h 31KB
avio.h 31KB
avio.h 31KB
swresample.h 25KB
swresample.h 25KB
swresample.h 25KB
swresample.h 25KB
hwcontext.h 24KB
hwcontext.h 24KB
hwcontext.h 24KB
hwcontext.h 24KB
packet.h 24KB
packet.h 24KB
packet.h 24KB
packet.h 24KB
mem.h 21KB
mem.h 21KB
mem.h 21KB
mem.h 21KB
intreadwrite.h 19KB
intreadwrite.h 19KB
intreadwrite.h 19KB
intreadwrite.h 19KB
codec_id.h 18KB
codec_id.h 18KB
codec_id.h 18KB
codec_id.h 18KB
common.h 17KB
common.h 17KB
common.h 17KB
common.h 17KB
swscale.h 16KB
swscale.h 16KB
swscale.h 16KB
swscale.h 16KB
pixdesc.h 16KB
pixdesc.h 16KB
pixdesc.h 16KB
pixdesc.h 16KB
fifo.h 16KB
fifo.h 16KB
fifo.h 16KB
fifo.h 16KB
avstring.h 15KB
avstring.h 15KB
avstring.h 15KB
avstring.h 15KB
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