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 (dusts.nosp@m.igns.nosp@m.@gmai.nosp@m.l.co.nosp@m.m)
#include <stdio.h>
#define OUTPUT_BIT_RATE 96000
#define OUTPUT_CHANNELS 2
{
fprintf(stderr, "Could not open input file '%s' (error '%s')\n",
*input_format_context =
NULL;
}
fprintf(stderr, "Could not open find stream info (error '%s')\n",
}
if ((*input_format_context)->nb_streams != 1) {
fprintf(stderr, "Expected one audio input stream, but found %d\n",
(*input_format_context)->nb_streams);
}
stream = (*input_format_context)->streams[0];
fprintf(stderr, "Could not find input codec\n");
}
if (!avctx) {
fprintf(stderr, "Could not allocate a decoding context\n");
}
}
fprintf(stderr, "Could not open input codec (error '%s')\n",
}
*input_codec_context = avctx;
return 0;
}
{
fprintf(stderr, "Could not open output file '%s' (error '%s')\n",
}
fprintf(stderr, "Could not allocate output format context\n");
}
(*output_format_context)->pb = output_io_context;
fprintf(stderr, "Could not find output file format\n");
}
if (!((*output_format_context)->url =
av_strdup(filename))) {
fprintf(stderr, "Could not allocate url.\n");
}
fprintf(stderr, "Could not find an AAC encoder.\n");
}
fprintf(stderr, "Could not create new stream\n");
}
if (!avctx) {
fprintf(stderr, "Could not allocate an encoding context\n");
}
fprintf(stderr, "Could not open output codec (error '%s')\n",
}
fprintf(stderr, "Could not initialize stream parameters\n");
}
*output_codec_context = avctx;
return 0;
*output_format_context =
NULL;
}
{
fprintf(stderr, "Could not allocate packet\n");
}
return 0;
}
{
fprintf(stderr, "Could not allocate input frame\n");
}
return 0;
}
{
fprintf(stderr, "Could not allocate resample context\n");
}
fprintf(stderr, "Could not open resample context\n");
}
return 0;
}
{
fprintf(stderr, "Could not allocate FIFO\n");
}
return 0;
}
{
fprintf(stderr, "Could not write output file header (error '%s')\n",
}
return 0;
}
int *data_present, int *finished)
{
*data_present = 0;
*finished = 0;
*finished = 1;
else {
fprintf(stderr, "Could not read frame (error '%s')\n",
}
}
fprintf(stderr, "Could not send packet for decoding (error '%s')\n",
}
*finished = 1;
fprintf(stderr, "Could not decode frame (error '%s')\n",
} else {
*data_present = 1;
}
}
{
fprintf(stderr,
"Could not allocate converted input samples (error '%s')\n",
}
return 0;
}
{
fprintf(stderr, "Could not convert input samples (error '%s')\n",
}
return 0;
}
uint8_t **converted_input_samples,
{
fprintf(stderr, "Could not reallocate FIFO\n");
}
fprintf(stderr, "Could not write data to FIFO\n");
}
return 0;
}
int *finished)
{
uint8_t **converted_input_samples =
NULL;
int data_present;
input_codec_context, &data_present, finished))
if (*finished) {
}
if (data_present) {
}
if (converted_input_samples)
}
{
fprintf(stderr, "Could not allocate output frame\n");
}
(*frame)->format = output_codec_context->
sample_fmt;
(*frame)->sample_rate = output_codec_context->
sample_rate;
fprintf(stderr, "Could not allocate output frame samples (error '%s')\n",
}
return 0;
}
int *data_present)
{
}
*data_present = 0;
fprintf(stderr, "Could not send packet for encoding (error '%s')\n",
}
fprintf(stderr, "Could not encode frame (error '%s')\n",
} else {
*data_present = 1;
}
if (*data_present &&
fprintf(stderr, "Could not write frame (error '%s')\n",
}
}
{
int data_written;
fprintf(stderr, "Could not read data from FIFO\n");
}
output_codec_context, &data_written)) {
}
return 0;
}
{
fprintf(stderr, "Could not write output file trailer (error '%s')\n",
}
return 0;
}
int main(
int argc,
char **argv)
{
if (argc != 3) {
fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
exit(1);
}
&input_codec_context))
&output_format_context, &output_codec_context))
&resample_context))
while (1) {
const int output_frame_size = output_codec_context->frame_size;
int finished = 0;
input_codec_context,
output_codec_context,
resample_context, &finished))
if (finished)
break;
}
output_codec_context))
if (finished) {
int data_written;
do {
output_codec_context, &data_written))
} while (data_written);
break;
}
}
if (fifo)
if (output_codec_context)
if (output_format_context) {
}
if (input_codec_context)
if (input_format_context)
}
static void error(const char *err)
void av_audio_fifo_free(AVAudioFifo *af)
Free an AVAudioFifo.
int frame_size
Number of samples per channel in an audio frame.
static int load_encode_and_write(AVAudioFifo *fifo, AVFormatContext *output_format_context, AVCodecContext *output_codec_context)
Load one audio frame from the FIFO buffer, encode and write it to the output file.
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
static int open_input_file(const char *filename, AVFormatContext **input_format_context, AVCodecContext **input_codec_context)
Open an input file and the required decoder.
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
int sample_rate
samples per second
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
int av_audio_fifo_write(AVAudioFifo *af, void *const *data, int nb_samples)
Write data to an AVAudioFifo.
int av_audio_fifo_realloc(AVAudioFifo *af, int nb_samples)
Reallocate an AVAudioFifo.
static int init_fifo(AVAudioFifo **fifo, AVCodecContext *output_codec_context)
Initialize a FIFO buffer for the audio samples to be encoded.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
const AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
This structure describes decoded (raw) audio or video data.
static av_cold void cleanup(FlashSV2Context *s)
static int write_output_file_header(AVFormatContext *output_format_context)
Write the header of the output file container.
static int open_output_file(const char *filename, AVCodecContext *input_codec_context, AVFormatContext **output_format_context, AVCodecContext **output_codec_context)
Open an output file and the required encoder.
int avio_open(AVIOContext **s, const char *filename, int flags)
Create and initialize a AVIOContext for accessing the resource indicated by url.
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
int nb_channels
Number of channels in this layout.
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
#define AV_CODEC_FLAG_GLOBAL_HEADER
Place global headers in extradata instead of every keyframe.
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Context for an Audio FIFO Buffer.
AVChannelLayout ch_layout
Audio channel layout.
static int output_packet(AVFormatContext *ctx, int flush)
int flags
AV_CODEC_FLAG_*.
int attribute_align_arg swr_convert(struct SwrContext *s, uint8_t *const *out_arg, int out_count, const uint8_t *const *in_arg, int in_count)
Convert audio.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
av_cold int swr_init(struct SwrContext *s)
Initialize context after user parameters have been set.
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
static int add_samples_to_fifo(AVAudioFifo *fifo, uint8_t **converted_input_samples, const int frame_size)
Add converted input audio samples to the FIFO buffer for later processing.
static int decode_audio_frame(AVFrame *frame, AVFormatContext *input_format_context, AVCodecContext *input_codec_context, int *data_present, int *finished)
Decode one audio frame from the input file.
int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder or encoder (when the AV_CODEC_FLAG_RECON_FRAME flag is used...
#define av_assert0(cond)
assert() equivalent, that is always enabled.
#define AVIO_FLAG_WRITE
write-only
The libswresample context.
av_warn_unused_result int avformat_write_header(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and write the stream header to an output media file.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
int avcodec_parameters_to_context(AVCodecContext *codec, const struct AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
AVAudioFifo * av_audio_fifo_alloc(enum AVSampleFormat sample_fmt, int channels, int nb_samples)
Allocate an AVAudioFifo.
static int read_decode_convert_and_store(AVAudioFifo *fifo, AVFormatContext *input_format_context, AVCodecContext *input_codec_context, AVCodecContext *output_codec_context, SwrContext *resampler_context, int *finished)
Read one audio frame from the input file, decode, convert and store it in the FIFO buffer.
int64_t bit_rate
the average bitrate
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
static int init_output_frame(AVFrame **frame, AVCodecContext *output_codec_context, int frame_size)
Initialize one input frame for writing to the output file.
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
static int init_input_frame(AVFrame **frame)
Initialize one audio frame for reading from the input file.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
int swr_alloc_set_opts2(struct SwrContext **ps, const AVChannelLayout *out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate, const AVChannelLayout *in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate, int log_offset, void *log_ctx)
Allocate SwrContext if needed and set/reset common parameters.
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
enum AVSampleFormat sample_fmt
audio sample format
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are expressed.
int av_audio_fifo_read(AVAudioFifo *af, void *const *data, int nb_samples)
Read data from an AVAudioFifo.
static int encode_audio_frame(AVFrame *frame, AVFormatContext *output_format_context, AVCodecContext *output_codec_context, int *data_present)
Encode one frame worth of audio to the output file.
int main(int argc, char **argv)
av_cold void swr_free(SwrContext **ss)
Free the given SwrContext and set the pointer to NULL.
static int init_packet(AVPacket **packet)
Initialize one data packet for reading or writing.
static int output_frame(H264Context *h, AVFrame *dst, H264Picture *srcp)
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
int av_audio_fifo_size(AVAudioFifo *af)
Get the current number of samples in the AVAudioFifo available for reading.
static int init_resampler(AVCodecContext *input_codec_context, AVCodecContext *output_codec_context, SwrContext **resample_context)
Initialize the audio resampler based on the input and output codec settings.
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
Get the default channel layout for a given number of channels.
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
int av_write_trailer(AVFormatContext *s)
Write the stream trailer to an output media file and free the file private data.
int nb_samples
number of audio samples (per channel) described by this frame
static int convert_samples(const uint8_t **input_data, uint8_t **converted_data, const int frame_size, SwrContext *resample_context)
Convert the input audio samples into the output sample format.
uint8_t ** extended_data
pointers to the data planes/channels.
static int init_converted_samples(uint8_t ***converted_input_samples, AVCodecContext *output_codec_context, int frame_size)
Initialize a temporary storage for the specified number of audio samples.
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
attribute_deprecated enum AVSampleFormat * sample_fmts
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
main external API structure.
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src)
Make a copy of a channel layout.
char * av_strdup(const char *s)
Duplicate a string.
const AVOutputFormat * av_guess_format(const char *short_name, const char *filename, const char *mime_type)
Return the output format in the list of registered output formats which best matches the provided par...
int av_samples_alloc_array_and_samples(uint8_t ***audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)
Allocate a data pointers array, samples buffer for nb_samples samples, and fill data pointers and lin...
int avcodec_parameters_from_context(struct AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
int avio_closep(AVIOContext **s)
Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...
#define AVERROR_EXIT
Immediate exit was requested; the called function should not be restarted.
static void input_data(MLPEncodeContext *ctx, MLPSubstream *s, uint8_t **const samples, int nb_samples)
Wrapper function for inputting data in two different bit-depths.
static int write_output_file_trailer(AVFormatContext *output_format_context)
Write the trailer of the output file container.