55 fprintf(stderr,
"Failed to create specified HW device.\n");
68 for (p = pix_fmts; *p != -1; p++) {
73 fprintf(stderr,
"Failed to get HW surface format.\n");
87 fprintf(stderr,
"Error during decoding\n");
93 fprintf(stderr,
"Can not alloc frame\n");
103 }
else if (ret < 0) {
104 fprintf(stderr,
"Error while decoding\n");
111 fprintf(stderr,
"Error transferring the data to system memory\n");
114 tmp_frame = sw_frame;
122 fprintf(stderr,
"Can not alloc buffer\n");
131 fprintf(stderr,
"Can not copy image to buffer\n");
135 if ((ret = fwrite(buffer, 1, size,
output_file)) < 0) {
136 fprintf(stderr,
"Failed to dump raw data.\n");
149 int main(
int argc,
char *argv[])
161 fprintf(stderr,
"Usage: %s <device type> <input file> <output file>\n", argv[0]);
167 fprintf(stderr,
"Device type %s is not supported.\n", argv[1]);
168 fprintf(stderr,
"Available device types:");
171 fprintf(stderr,
"\n");
177 fprintf(stderr,
"Cannot open input file '%s'\n", argv[2]);
182 fprintf(stderr,
"Cannot find input stream information.\n");
189 fprintf(stderr,
"Cannot find a video stream in the input file\n");
197 fprintf(stderr,
"Decoder %s does not support device type %s.\n",
221 fprintf(stderr,
"Failed to open codec for stream #%u\n", video_stream);
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
This structure describes decoded (raw) audio or video data.
int av_image_copy_to_buffer(uint8_t *dst, int dst_size, const uint8_t *const src_data[4], const int src_linesize[4], enum AVPixelFormat pix_fmt, int width, int height, int align)
Copy image data from an image into a buffer.
static enum AVPixelFormat get_hw_format(AVCodecContext *ctx, const enum AVPixelFormat *pix_fmts)
enum AVHWDeviceType av_hwdevice_find_type_by_name(const char *name)
Look up an AVHWDeviceType by name.
static AVCodecContext * decoder_ctx
static AVStream * video_stream
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
enum AVPixelFormat pix_fmt
For decoders, a hardware pixel format which that decoder may be able to decode to if suitable hardwar...
AVStream ** streams
A list of all streams in the file.
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
int av_hwdevice_ctx_create(AVBufferRef **pdevice_ref, enum AVHWDeviceType type, const char *device, AVDictionary *opts, int flags)
Open a device of the specified type and create an AVHWDeviceContext for it.
#define AVERROR_EOF
End of file.
The codec supports this format via the hw_device_ctx interface.
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters...
static AVBufferRef * hw_device_ctx
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
int methods
Bit set of AV_CODEC_HW_CONFIG_METHOD_* flags, describing the possible setup methods which can be used...
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
int main(int argc, char *argv[])
simple assert() macros that are a bit more flexible than ISO C assert().
const char * name
Name of the codec implementation.
int av_hwframe_transfer_data(AVFrame *dst, const AVFrame *src, int flags)
Copy data to or from a hw surface.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
static const chunk_decoder decoder[8]
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
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
static FILE * output_file
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Libavcodec external API header.
static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type)
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
const AVCodecHWConfig * avcodec_get_hw_config(const AVCodec *codec, int index)
Retrieve supported hardware configurations for a codec.
main external API structure.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
static int decode_write(AVCodecContext *avctx, AVPacket *packet)
const char * av_hwdevice_get_type_name(enum AVHWDeviceType type)
Get the string name of an AVHWDeviceType.
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
static enum AVPixelFormat pix_fmts[]
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
A reference to a data buffer.
static enum AVPixelFormat hw_pix_fmt
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
enum AVHWDeviceType av_hwdevice_iterate_types(enum AVHWDeviceType prev)
Iterate over supported device types.
A Quick Description Of Rate Distortion Theory We want to encode a video
AVCodecParameters * codecpar
Codec parameters associated with this stream.
enum AVHWDeviceType device_type
The device type associated with the configuration.
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
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
AVPixelFormat
Pixel format.
This structure stores compressed data.