45 #define STREAM_DURATION 5.0
46 #define STREAM_FRAME_RATE 25
47 #define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
48 #define STREAM_PIX_FMT AV_PIX_FMT_YUV420P
50 #define SCALE_FLAGS SWS_BICUBIC
84 fprintf(stderr,
"codec not found\n");
90 fprintf(stderr,
"Could not alloc stream\n");
116 fprintf(stderr,
"Error allocating the resampling context\n");
129 fprintf(stderr,
"Error opening the resampling context\n");
135 uint64_t channel_layout,
136 int sample_rate,
int nb_samples)
142 fprintf(stderr,
"Error allocating an audio frame\n");
154 fprintf(stderr,
"Error allocating an audio buffer\n");
171 fprintf(stderr,
"could not open codec\n");
198 int16_t *q = (int16_t*)frame->
data[0];
207 v = (int)(sin(ost->
t) * 10000);
236 fprintf(stderr,
"Error while writing audio frame\n");
241 return (frame || got_packet) ? 0 : 1;
255 got_output |= !!frame;
263 fprintf(stderr,
"Error feeding audio data to the resampler\n");
292 fprintf(stderr,
"Error while resampling\n");
295 fprintf(stderr,
"Too few samples returned from lavr\n");
323 fprintf(stderr,
"codec not found\n");
329 fprintf(stderr,
"Could not alloc stream\n");
380 fprintf(stderr,
"Could not allocate frame data.\n");
395 fprintf(stderr,
"could not open codec\n");
402 fprintf(stderr,
"Could not allocate picture\n");
413 fprintf(stderr,
"Could not allocate temporary picture\n");
436 for (y = 0; y <
height; y++)
437 for (x = 0; x <
width; x++)
438 pict->
data[0][y * pict->
linesize[0] + x] = x + y + i * 3;
441 for (y = 0; y < height / 2; y++) {
442 for (x = 0; x < width / 2; x++) {
443 pict->
data[1][y * pict->
linesize[1] + x] = 128 + y + i * 2;
444 pict->
data[2][y * pict->
linesize[2] + x] = 64 + x + i * 5;
469 "Cannot initialize the conversion context\n");
524 fprintf(stderr,
"Error encoding a video frame\n");
537 fprintf(stderr,
"Error while writing video frame\n");
541 return (frame || got_packet) ? 0 : 1;
556 int main(
int argc,
char **argv)
559 const char *filename;
562 int have_video = 0, have_audio = 0;
563 int encode_video = 0, encode_audio = 0;
569 printf(
"usage: %s output_file\n"
570 "API example program to output a media file with libavformat.\n"
571 "The output format is automatically guessed according to the file extension.\n"
572 "Raw images can also be output by using '%%d' in the filename\n"
582 printf(
"Could not deduce output format from file extension: using MPEG.\n");
586 fprintf(stderr,
"Could not find suitable output format\n");
593 fprintf(stderr,
"Memory error\n");
624 fprintf(stderr,
"Could not open '%s'\n", filename);
632 while (encode_video || encode_audio) {
636 audio_st.next_pts, audio_st.st->codec->time_base) <= 0)) {
int avio_open(AVIOContext **s, const char *url, int flags)
Create and initialize a AVIOContext for accessing the resource indicated by url.
const struct AVCodec * codec
This structure describes decoded (raw) audio or video data.
AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file ensuring correct interleaving.
#define CODEC_CAP_VARIABLE_FRAME_SIZE
Audio encoder supports receiving a different number of samples in each call.
static void close_stream(AVFormatContext *oc, OutputStream *ost)
int avformat_write_header(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and write the stream header to an output media file.
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
int avresample_read(AVAudioResampleContext *avr, uint8_t **output, int nb_samples)
Read samples from the output FIFO.
int index
stream index in AVFormatContext
#define AVIO_FLAG_WRITE
write-only
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of audio.
#define AV_CH_LAYOUT_STEREO
four components are given, that's all.
void avresample_free(AVAudioResampleContext **avr)
Free AVAudioResampleContext and associated AVOption values.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
enum AVSampleFormat sample_fmt
audio sample format
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
#define CODEC_FLAG_GLOBAL_HEADER
Place global headers in extradata instead of every keyframe.
AVAudioResampleContext * avr
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of video.
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
struct SwsContext * sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)
Allocate and return an SwsContext.
external api for the swscale stuff
static AVFrame * alloc_audio_frame(enum AVSampleFormat sample_fmt, uint64_t channel_layout, int sample_rate, int nb_samples)
static void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
struct AVOutputFormat * oformat
The output container format.
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
void av_dump_format(AVFormatContext *ic, int index, const char *url, int is_output)
Print detailed information about the input or output format, such as duration, bitrate, streams, container, programs, metadata, side data, codec and time base.
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
const uint64_t * channel_layouts
array of support channel layouts, or NULL if unknown. array is terminated by 0
AVCodecID
Identify the syntax and semantics of the bitstream.
int width
width and height of the video frame
void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst)
Convert valid timing fields (timestamps / durations) in a packet from one timebase to another...
static int encode_audio_frame(AVFormatContext *oc, OutputStream *ost, AVFrame *frame)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
int capabilities
Codec capabilities.
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
int flags
A combination of AV_PKT_FLAG values.
uint64_t channel_layout
Audio channel layout.
int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
Compare 2 timestamps each in its own timebases.
AVCodecContext * codec
Codec context associated with this stream.
uint64_t channel_layout
Channel layout of the audio data.
int bit_rate
the average bitrate
static AVFrame * get_video_frame(OutputStream *ost)
audio channel layout utility functions
char filename[1024]
input or output filename
static int process_audio_stream(AVFormatContext *oc, OutputStream *ost)
static int write_video_frame(AVFormatContext *oc, OutputStream *ost)
int width
picture width / height.
static AVFrame * get_audio_frame(OutputStream *ost)
static void add_video_stream(OutputStream *ost, AVFormatContext *oc, enum AVCodecID codec_id)
int main(int argc, char **argv)
void sws_freeContext(struct SwsContext *swsContext)
Free the swscaler context swsContext.
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 mb_decision
macroblock decision mode
enum AVPixelFormat pix_fmt
preferred ID for MPEG-1/2 video decoding
if(ac->has_optimized_func)
static void add_audio_stream(OutputStream *ost, AVFormatContext *oc, enum AVCodecID codec_id)
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
int frame_size
Number of samples per channel in an audio frame.
int avresample_available(AVAudioResampleContext *avr)
Return the number of available samples in the output FIFO.
AVSampleFormat
Audio Sample Formats.
int sample_rate
samples per second
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
AVIOContext * pb
I/O context.
main external API structure.
int avresample_get_out_samples(AVAudioResampleContext *avr, int in_nb_samples)
Provide the upper bound on the number of samples the configured conversion would output.
int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])
Scale the image slice in srcSlice and put the resulting scaled slice in the image in dst...
int sample_rate
Sample rate of the audio data.
rational number numerator/denominator
static AVFrame * alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
int avresample_convert(AVAudioResampleContext *avr, uint8_t **output, int out_plane_size, int out_samples, uint8_t **input, int in_plane_size, int in_samples)
Convert input samples and write them to the output FIFO.
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
AVAudioResampleContext * avresample_alloc_context(void)
Allocate AVAudioResampleContext and set options.
static void open_video(AVFormatContext *oc, OutputStream *ost)
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
static void open_audio(AVFormatContext *oc, OutputStream *ost)
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
int channels
number of audio channels
const int * supported_samplerates
array of supported audio samplerates, or NULL if unknown, array is terminated by 0 ...
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
int av_write_trailer(AVFormatContext *s)
Write the stream trailer to an output media file and free the file private data.
enum AVSampleFormat * sample_fmts
array of supported sample formats, or NULL if unknown, array is terminated by -1
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
uint8_t ** extended_data
pointers to the data planes/channels.
#define STREAM_FRAME_RATE
AVPixelFormat
Pixel format.
This structure stores compressed data.
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
int avresample_open(AVAudioResampleContext *avr)
Initialize AVAudioResampleContext.
int nb_samples
number of audio samples (per channel) described by this frame
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
struct SwsContext * sws_ctx