FFmpeg
1.2.4
|
Data Structures | |
struct | AVCodecParserContext |
struct | AVCodecParser |
Typedefs | |
typedef struct AVCodecParserContext | AVCodecParserContext |
typedef struct AVCodecParser | AVCodecParser |
typedef struct AVCodecParserContext | AVCodecParserContext |
typedef struct AVCodecParser | AVCodecParser |
typedef struct AVCodecParserContext | AVCodecParserContext |
typedef struct AVCodecParser | AVCodecParser |
Functions | |
AVCodecParser * | av_parser_next (AVCodecParser *c) |
void | av_register_codec_parser (AVCodecParser *parser) |
AVCodecParserContext * | av_parser_init (int codec_id) |
int | av_parser_parse2 (AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos) |
Parse a packet. | |
int | av_parser_change (AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe) |
void | av_parser_close (AVCodecParserContext *s) |
Find a registered decoder with a matching codec ID.
id | AVCodecID of the requested decoder |
Find a registered decoder with the specified name.
name | name of the requested decoder |
Return the amount of padding in pixels which the get_buffer callback must provide around the edge of the image for codecs which do not have the CODEC_FLAG_EMU_EDGE flag.
Modify width and height values so that they will result in a memory buffer that is acceptable for the codec if you do not use any horizontal padding.
May only be used if a codec with CODEC_CAP_DR1 has been opened. If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased according to avcodec_get_edge_width() before.
Modify width and height values so that they will result in a memory buffer that is acceptable for the codec if you also ensure that all line sizes are a multiple of the respective linesize_align[i].
May only be used if a codec with CODEC_CAP_DR1 has been opened. If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased according to avcodec_get_edge_width() before.
Wrapper function which calls avcodec_decode_audio4.
Decode the audio frame of size avpkt->size from avpkt->data into samples. Some decoders may support multiple frames in a single AVPacket, such decoders would then just decode the first frame. In this case, avcodec_decode_audio3 has to be called again with an AVPacket that contains the remaining data in order to decode the second frame etc. If no frame could be outputted, frame_size_ptr is zero. Otherwise, it is the decompressed frame size in bytes.
In practice, avpkt->data should have 4 byte alignment at minimum and samples should be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do).
avctx | the codec context | |
[out] | samples | the output buffer, sample type in avctx->sample_fmt If the sample format is planar, each channel plane will be the same size, with no padding between channels. |
[in,out] | frame_size_ptr | the output buffer size in bytes |
[in] | avpkt | The input AVPacket containing the input buffer. You can create such packet with av_init_packet() and by then setting data and size, some decoders might in addition need other fields. All decoders are designed to use the least fields possible though. |
Decode the audio frame of size avpkt->size from avpkt->data into frame.
Some decoders may support multiple frames in a single AVPacket. Such decoders would then just decode the first frame. In this case, avcodec_decode_audio4 has to be called again with an AVPacket containing the remaining data in order to decode the second frame, etc... Even if no frames are returned, the packet needs to be fed to the decoder with remaining data until it is completely consumed or an error occurs.
avctx | the codec context | |
[out] | frame | The AVFrame in which to store decoded audio samples. Decoders request a buffer of a particular size by setting AVFrame.nb_samples prior to calling get_buffer(). The decoder may, however, only utilize part of the buffer by setting AVFrame.nb_samples to a smaller value in the output frame. |
[out] | got_frame_ptr | Zero if no frame could be decoded, otherwise it is non-zero. |
[in] | avpkt | The input AVPacket containing the input buffer. At least avpkt->data and avpkt->size should be set. Some decoders might also require additional fields to be set. |
Decode the video frame of size avpkt->size from avpkt->data into picture. Some decoders may support multiple frames in a single AVPacket, such decoders would then just decode the first frame.
In practice, avpkt->data should have 4 byte alignment at minimum.
avctx | the codec context | |
[out] | picture | The AVFrame in which the decoded video frame will be stored. Use avcodec_alloc_frame to get an AVFrame, the codec will allocate memory for the actual bitmap. with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit. with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder decodes and the decoder tells the user once it does not need the data anymore, the user app can at this point free/reuse/keep the memory as it sees fit. |
[in] | avpkt | The input AVpacket containing the input buffer. You can create such packet with av_init_packet() and by then setting data and size, some decoders might in addition need other fields like flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least fields possible. |
[in,out] | got_picture_ptr | Zero if no frame could be decompressed, otherwise, it is nonzero. |
Decode a subtitle message. Return a negative value on error, otherwise return the number of bytes used. If no subtitle could be decompressed, got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for simplicity, because the performance difference is expect to be negligible and reusing a get_buffer written for video codecs would probably perform badly due to a potentially very different allocation pattern.
avctx | the codec context | |
[out] | sub | The AVSubtitle in which the decoded subtitle will be stored, must be freed with avsubtitle_free if *got_sub_ptr is set. |
[in,out] | got_sub_ptr | Zero if no subtitle could be decompressed, otherwise, it is nonzero. |
[in] | avpkt | The input AVPacket containing the input buffer. |
Find a registered decoder with a matching codec ID.
id | AVCodecID of the requested decoder |
Find a registered decoder with the specified name.
name | name of the requested decoder |
Return the amount of padding in pixels which the get_buffer callback must provide around the edge of the image for codecs which do not have the CODEC_FLAG_EMU_EDGE flag.
Modify width and height values so that they will result in a memory buffer that is acceptable for the codec if you do not use any horizontal padding.
May only be used if a codec with CODEC_CAP_DR1 has been opened. If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased according to avcodec_get_edge_width() before.
Modify width and height values so that they will result in a memory buffer that is acceptable for the codec if you also ensure that all line sizes are a multiple of the respective linesize_align[i].
May only be used if a codec with CODEC_CAP_DR1 has been opened. If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased according to avcodec_get_edge_width() before.
Wrapper function which calls avcodec_decode_audio4.
Decode the audio frame of size avpkt->size from avpkt->data into samples. Some decoders may support multiple frames in a single AVPacket, such decoders would then just decode the first frame. In this case, avcodec_decode_audio3 has to be called again with an AVPacket that contains the remaining data in order to decode the second frame etc. If no frame could be outputted, frame_size_ptr is zero. Otherwise, it is the decompressed frame size in bytes.
In practice, avpkt->data should have 4 byte alignment at minimum and samples should be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do).
avctx | the codec context | |
[out] | samples | the output buffer, sample type in avctx->sample_fmt If the sample format is planar, each channel plane will be the same size, with no padding between channels. |
[in,out] | frame_size_ptr | the output buffer size in bytes |
[in] | avpkt | The input AVPacket containing the input buffer. You can create such packet with av_init_packet() and by then setting data and size, some decoders might in addition need other fields. All decoders are designed to use the least fields possible though. |
Decode the audio frame of size avpkt->size from avpkt->data into frame.
Some decoders may support multiple frames in a single AVPacket. Such decoders would then just decode the first frame. In this case, avcodec_decode_audio4 has to be called again with an AVPacket containing the remaining data in order to decode the second frame, etc... Even if no frames are returned, the packet needs to be fed to the decoder with remaining data until it is completely consumed or an error occurs.
avctx | the codec context | |
[out] | frame | The AVFrame in which to store decoded audio samples. Decoders request a buffer of a particular size by setting AVFrame.nb_samples prior to calling get_buffer(). The decoder may, however, only utilize part of the buffer by setting AVFrame.nb_samples to a smaller value in the output frame. |
[out] | got_frame_ptr | Zero if no frame could be decoded, otherwise it is non-zero. |
[in] | avpkt | The input AVPacket containing the input buffer. At least avpkt->data and avpkt->size should be set. Some decoders might also require additional fields to be set. |
Decode the video frame of size avpkt->size from avpkt->data into picture. Some decoders may support multiple frames in a single AVPacket, such decoders would then just decode the first frame.
In practice, avpkt->data should have 4 byte alignment at minimum.
avctx | the codec context | |
[out] | picture | The AVFrame in which the decoded video frame will be stored. Use avcodec_alloc_frame to get an AVFrame, the codec will allocate memory for the actual bitmap. with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit. with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder decodes and the decoder tells the user once it does not need the data anymore, the user app can at this point free/reuse/keep the memory as it sees fit. |
[in] | avpkt | The input AVpacket containing the input buffer. You can create such packet with av_init_packet() and by then setting data and size, some decoders might in addition need other fields like flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least fields possible. |
[in,out] | got_picture_ptr | Zero if no frame could be decompressed, otherwise, it is nonzero. |
Decode a subtitle message. Return a negative value on error, otherwise return the number of bytes used. If no subtitle could be decompressed, got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for simplicity, because the performance difference is expect to be negligible and reusing a get_buffer written for video codecs would probably perform badly due to a potentially very different allocation pattern.
avctx | the codec context | |
[out] | sub | The AVSubtitle in which the decoded subtitle will be stored, must be freed with avsubtitle_free if *got_sub_ptr is set. |
[in,out] | got_sub_ptr | Zero if no subtitle could be decompressed, otherwise, it is nonzero. |
[in] | avpkt | The input AVPacket containing the input buffer. |
typedef struct AVCodecParser AVCodecParser |
typedef struct AVCodecParser AVCodecParser |
typedef struct AVCodecParser AVCodecParser |
typedef struct AVCodecParserContext AVCodecParserContext |
typedef struct AVCodecParserContext AVCodecParserContext |
typedef struct AVCodecParserContext AVCodecParserContext |
int av_parser_change | ( | AVCodecParserContext * | s, |
AVCodecContext * | avctx, | ||
uint8_t ** | poutbuf, | ||
int * | poutbuf_size, | ||
const uint8_t * | buf, | ||
int | buf_size, | ||
int | keyframe | ||
) |
void av_parser_close | ( | AVCodecParserContext * | s | ) |
Definition at line 202 of file parser.c.
Referenced by av_bitstream_filter_close(), check_format(), estimate_timings_from_pts(), ff_free_parser_state(), ff_free_stream(), ff_read_frame_flush(), and uninit().
AVCodecParserContext * av_parser_init | ( | int | codec_id | ) |
Definition at line 41 of file parser.c.
Referenced by avformat_find_stream_info(), check_format(), init(), read_frame_internal(), and remove_extradata().
AVCodecParser * av_parser_next | ( | AVCodecParser * | c | ) |
int av_parser_parse2 | ( | AVCodecParserContext * | s, |
AVCodecContext * | avctx, | ||
uint8_t ** | poutbuf, | ||
int * | poutbuf_size, | ||
const uint8_t * | buf, | ||
int | buf_size, | ||
int64_t | pts, | ||
int64_t | dts, | ||
int64_t | pos | ||
) |
Parse a packet.
s | parser context. |
avctx | codec context. |
poutbuf | set to pointer to parsed buffer or NULL if not yet finished. |
poutbuf_size | set to size of parsed buffer or zero if not yet finished. |
buf | input buffer. |
buf_size | input length, to signal EOF, this should be 0 (so that the last frame can be output). |
pts | input presentation timestamp. |
dts | input decoding timestamp. |
pos | input byte position in stream. |
Example:
Definition at line 112 of file parser.c.
Referenced by check_format(), decode(), and parse_packet().
void av_register_codec_parser | ( | AVCodecParser * | parser | ) |