Go to the documentation of this file.
47 #define OUTPUT_BIT_RATE 96000
49 #define OUTPUT_CHANNELS 2
69 fprintf(stderr,
"Could not open input file '%s' (error '%s')\n",
71 *input_format_context =
NULL;
77 fprintf(stderr,
"Could not open find stream info (error '%s')\n",
84 if ((*input_format_context)->nb_streams != 1) {
85 fprintf(stderr,
"Expected one audio input stream, but found %d\n",
86 (*input_format_context)->nb_streams);
92 if (!(input_codec =
avcodec_find_decoder((*input_format_context)->streams[0]->codecpar->codec_id))) {
93 fprintf(stderr,
"Could not find input codec\n");
101 fprintf(stderr,
"Could not allocate a decoding context\n");
116 fprintf(stderr,
"Could not open input codec (error '%s')\n",
124 *input_codec_context = avctx;
153 fprintf(stderr,
"Could not open output file '%s' (error '%s')\n",
160 fprintf(stderr,
"Could not allocate output format context\n");
165 (*output_format_context)->pb = output_io_context;
170 fprintf(stderr,
"Could not find output file format\n");
174 if (!((*output_format_context)->url =
av_strdup(filename))) {
175 fprintf(stderr,
"Could not allocate url.\n");
182 fprintf(stderr,
"Could not find an AAC encoder.\n");
188 fprintf(stderr,
"Could not create new stream\n");
195 fprintf(stderr,
"Could not allocate an encoding context\n");
222 fprintf(stderr,
"Could not open output codec (error '%s')\n",
229 fprintf(stderr,
"Could not initialize stream parameters\n");
234 *output_codec_context = avctx;
242 *output_format_context =
NULL;
266 fprintf(stderr,
"Could not allocate input frame\n");
302 if (!*resample_context) {
303 fprintf(stderr,
"Could not allocate resample context\n");
315 fprintf(stderr,
"Could not open resample context\n");
332 output_codec_context->
channels, 1))) {
333 fprintf(stderr,
"Could not allocate FIFO\n");
348 fprintf(stderr,
"Could not write output file header (error '%s')\n",
371 int *data_present,
int *finished)
384 fprintf(stderr,
"Could not read frame (error '%s')\n",
393 fprintf(stderr,
"Could not send packet for decoding (error '%s')\n",
410 }
else if (
error < 0) {
411 fprintf(stderr,
"Could not decode frame (error '%s')\n",
447 if (!(*converted_input_samples = calloc(output_codec_context->
channels,
448 sizeof(**converted_input_samples)))) {
449 fprintf(stderr,
"Could not allocate converted input sample pointers\n");
460 "Could not allocate converted input samples (error '%s')\n",
462 av_freep(&(*converted_input_samples)[0]);
463 free(*converted_input_samples);
491 fprintf(stderr,
"Could not convert input samples (error '%s')\n",
508 uint8_t **converted_input_samples,
516 fprintf(stderr,
"Could not reallocate FIFO\n");
523 fprintf(stderr,
"Could not write data to FIFO\n");
556 int data_present = 0;
564 input_codec_context, &data_present, finished))
595 if (converted_input_samples) {
596 av_freep(&converted_input_samples[0]);
597 free(converted_input_samples);
620 fprintf(stderr,
"Could not allocate output frame\n");
631 (*frame)->format = output_codec_context->
sample_fmt;
632 (*frame)->sample_rate = output_codec_context->
sample_rate;
637 fprintf(stderr,
"Could not allocate output frame samples (error '%s')\n",
681 }
else if (
error < 0) {
682 fprintf(stderr,
"Could not send packet for encoding (error '%s')\n",
698 }
else if (
error < 0) {
699 fprintf(stderr,
"Could not encode frame (error '%s')\n",
710 fprintf(stderr,
"Could not write frame (error '%s')\n",
748 fprintf(stderr,
"Could not read data from FIFO\n");
755 output_codec_context, &data_written)) {
772 fprintf(stderr,
"Could not write output file trailer (error '%s')\n",
779 int main(
int argc,
char **argv)
788 fprintf(stderr,
"Usage: %s <input file> <output file>\n", argv[0]);
794 &input_codec_context))
798 &output_format_context, &output_codec_context))
805 if (
init_fifo(&fifo, output_codec_context))
815 const int output_frame_size = output_codec_context->frame_size;
828 output_codec_context,
829 resample_context, &finished))
846 output_codec_context))
857 output_codec_context, &data_written))
859 }
while (data_written);
873 if (output_codec_context)
875 if (output_format_context) {
879 if (input_codec_context)
881 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.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
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
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
static int open_input_file(const char *filename, AVFormatContext **input_format_context, AVCodecContext **input_codec_context)
Open an input file and the required decoder.
uint64_t channel_layout
Audio channel layout.
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
#define FF_COMPLIANCE_EXPERIMENTAL
Allow nonstandardized experimental things.
int sample_rate
samples per second
#define AVERROR_EOF
End of file.
int avcodec_parameters_from_context(AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
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.
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 av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
#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.
ff_const59 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...
Context for an Audio FIFO Buffer.
enum AVSampleFormat * sample_fmts
array of supported sample formats, or NULL if unknown, array is terminated by -1
int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)
Allocate a samples buffer for nb_samples samples, and fill data pointers and linesize accordingly.
AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
int flags
AV_CODEC_FLAG_*.
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.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
int av_audio_fifo_write(AVAudioFifo *af, void **data, int nb_samples)
Write data to an AVAudioFifo.
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 avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
#define av_assert0(cond)
assert() equivalent, that is always enabled.
#define AVIO_FLAG_WRITE
write-only
int attribute_align_arg swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count, const uint8_t *in_arg[SWR_CH_MAX], int in_count)
The libswresample context.
struct SwrContext * swr_alloc_set_opts(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate, int64_t 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.
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.
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 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.
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.
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
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 output_frame(H264Context *h, AVFrame *dst, H264Picture *srcp)
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.
static void input_data(MLPEncodeContext *ctx, void *samples)
Wrapper function for inputting data in two different bit-depths.
int channels
number of audio channels
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
int avio_closep(AVIOContext **s)
Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...
int av_audio_fifo_read(AVAudioFifo *af, void **data, int nb_samples)
Read data from an AVAudioFifo.
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
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
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.
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
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.
static void output_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int eof)
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
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
main external API structure.
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
int avio_open(AVIOContext **s, const char *url, int flags)
Create and initialize a AVIOContext for accessing the resource indicated by url.
char * av_strdup(const char *s)
Duplicate a string.
static void init_packet(AVPacket *packet)
Initialize one data packet for reading or writing.
int64_t av_get_default_channel_layout(int nb_channels)
Return default channel layout for a given number of channels.
This structure stores compressed data.
#define AVERROR_EXIT
Immediate exit was requested; the called function should not be restarted.
static int write_output_file_trailer(AVFormatContext *output_format_context)
Write the trailer of the output file container.
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.