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12 * Lesser General Public License for more details.
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19 #ifndef AVCODEC_DV_PROFILE_H
20 #define AVCODEC_DV_PROFILE_H
24 #include "libavutil/pixfmt.h"
25 #include "libavutil/rational.h"
28 /* minimum number of bytes to read from a DV stream in order to
29 * determine the profile */
30 #define DV_PROFILE_BYTES (6 * 80) /* 6 DIF blocks */
34 * AVDVProfile is used to express the differences between various
35 * DV flavors. For now it's primarily used for differentiating
36 * 525/60 and 625/50, but the plans are to use it for various
37 * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
39 typedef struct AVDVProfile {
40 int dsf; /* value of the dsf in the DV header */
41 int video_stype; /* stype for VAUX source pack */
42 int frame_size; /* total size of one frame in bytes */
43 int difseg_size; /* number of DIF segments per DIF channel */
44 int n_difchan; /* number of DIF channels per frame */
45 AVRational time_base; /* 1/framerate */
46 int ltc_divisor; /* FPS from the LTS standpoint */
47 int height; /* picture height in pixels */
48 int width; /* picture width in pixels */
49 AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */
50 enum AVPixelFormat pix_fmt; /* picture pixel format */
51 int bpm; /* blocks per macroblock */
52 const uint8_t *block_sizes; /* AC block sizes, in bits */
53 int audio_stride; /* size of audio_shuffle table */
54 int audio_min_samples[3]; /* min amount of audio samples */
55 /* for 48kHz, 44.1kHz and 32kHz */
56 int audio_samples_dist[5]; /* how many samples are supposed to be */
57 /* in each frame in a 5 frames window */
58 const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */
62 * Get a DV profile for the provided compressed frame.
64 * @param sys the profile used for the previous frame, may be NULL
65 * @param frame the compressed data buffer
66 * @param buf_size size of the buffer in bytes
67 * @return the DV profile for the supplied data or NULL on failure
69 const AVDVProfile *av_dv_frame_profile(const AVDVProfile *sys,
70 const uint8_t *frame, unsigned buf_size);
73 * Get a DV profile for the provided stream parameters.
75 const AVDVProfile *av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt);
78 * Get a DV profile for the provided stream parameters.
79 * The frame rate is used as a best-effort parameter.
81 const AVDVProfile *av_dv_codec_profile2(int width, int height, enum AVPixelFormat pix_fmt, AVRational frame_rate);
83 #endif /* AVCODEC_DV_PROFILE_H */