* @file dvdata.h
* Constants for DV codec.
*/
-
+
+/*
+ * DVprofile is used to express the differences between various
+ * DV flavors. For now it's primarily used for differentiating
+ * 525/60 and 625/50, but the plans are to use it for various
+ * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
+ */
+typedef struct DVprofile {
+ int dsf; /* value of the dsf in the DV header */
+ int frame_size; /* total size of one frame in bytes */
+ int difseg_size; /* number of DIF segments */
+ int frame_rate;
+ int frame_rate_base;
+ int ltc_divisor; /* FPS from the LTS standpoint */
+ int height; /* picture height in pixels */
+ int width; /* picture width in pixels */
+ AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */
+ const uint16_t *video_place; /* positions of all DV macro blocks */
+ enum PixelFormat pix_fmt; /* picture pixel format */
+
+ int audio_stride; /* size of audio_shuffle table */
+ int audio_min_samples[3];/* min ammount of audio samples */
+ /* for 48Khz, 44.1Khz and 32Khz */
+ int audio_samples_dist[5];/* how many samples are supposed to be */
+ /* in each frame in a 5 frames window */
+ const uint16_t (*audio_shuffle)[9]; /* PCM shuffling table */
+} DVprofile;
+
#define NB_DV_VLC 409
-#define AAUX_AS_OFFSET (80*6 + 80*16*3 + 3)
-#define AAUX_ASC_OFFSET (80*6 + 80*16*4 + 3)
-#define VAUX_TC61_OFFSET (80*5 + 48 + 5)
+/*
+ * There's a catch about the following three tables: the mapping they establish
+ * between (run, level) and vlc is not 1-1. So you have to watch out for that
+ * when building misc. tables. E.g. (1, 0) can be either 0x7cf or 0x1f82.
+ */
static const uint16_t dv_vlc_bits[409] = {
0x0000, 0x0002, 0x0007, 0x0008, 0x0009, 0x0014, 0x0015, 0x0016,
0x0017, 0x0030, 0x0031, 0x0032, 0x0033, 0x0068, 0x0069, 0x006a,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
- 0,
+127,
};
static const uint8_t dv_vlc_level[409] = {
0,
};
-/* Specific zigzag scan for 248 idct. NOTE that unlike the
- specification, we interleave the fields */
-static const uint8_t dv_248_zigzag[64] = {
- 0, 8, 1, 9, 16, 24, 2, 10,
- 17, 25, 32, 40, 48, 56, 33, 41,
- 18, 26, 3, 11, 4, 12, 19, 27,
- 34, 42, 49, 57, 50, 58, 35, 43,
- 20, 28, 5, 13, 6, 14, 21, 29,
- 36, 44, 51, 59, 52, 60, 37, 45,
- 22, 30, 7, 15, 23, 31, 38, 46,
- 53, 61, 54, 62, 39, 47, 55, 63,
-};
-
/* unquant tables (not used directly) */
static const uint8_t dv_88_areas[64] = {
0,0,0,1,1,1,2,2,
1,2,2,3,3,3,3,3,
};
-static uint8_t dv_quant_shifts[22][4] = {
+static const uint8_t dv_quant_shifts[22][4] = {
{ 3,3,4,4 },
{ 3,3,4,4 },
{ 2,3,3,4 },
0x0834, 0x2320, 0x2f44, 0x3810, 0x1658,
};
-static const uint16_t dv_place_audio60[10][9] = {
+static const uint16_t dv_audio_shuffle525[10][9] = {
{ 0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
{ 6, 36, 66, 26, 56, 86, 16, 46, 76 },
{ 12, 42, 72, 2, 32, 62, 22, 52, 82 },
{ 25, 55, 85, 15, 45, 75, 5, 35, 65 },
};
-static const uint16_t dv_place_audio50[12][9] = {
+static const uint16_t dv_audio_shuffle625[12][9] = {
{ 0, 36, 72, 26, 62, 98, 16, 52, 88}, /* 1st channel */
{ 6, 42, 78, 32, 68, 104, 22, 58, 94},
{ 12, 48, 84, 2, 38, 74, 28, 64, 100},
{ 31, 67, 103, 21, 57, 93, 11, 47, 83},
};
-static const int dv_audio_frequency[3] = {
- 48000, 44100, 32000,
+static const __attribute__((unused)) int dv_audio_frequency[3] = {
+ 48000, 44100, 32000,
};
-
-static const int dv_audio_min_samples[2][3] = {
- { 1580, 1452, 1053 }, /* 60 fields */
- { 1896, 1742, 1264 }, /* 50 fileds */
+
+static const DVprofile dv_profiles[] = {
+ { .dsf = 0,
+ .frame_size = 120000, /* IEC 61834, SMPTE-314M - 525/60 (NTSC) */
+ .difseg_size = 10,
+ .frame_rate = 30000,
+ .ltc_divisor = 30,
+ .frame_rate_base = 1001,
+ .height = 480,
+ .width = 720,
+ .sar = {{10, 11}, {40, 33}},
+ .video_place = dv_place_411,
+ .pix_fmt = PIX_FMT_YUV411P,
+ .audio_stride = 90,
+ .audio_min_samples = { 1580, 1452, 1053 }, /* for 48, 44.1 and 32Khz */
+ .audio_samples_dist = { 1602, 1601, 1602, 1601, 1602 },
+ .audio_shuffle = dv_audio_shuffle525,
+ },
+ { .dsf = 1,
+ .frame_size = 144000, /* IEC 61834 - 625/50 (PAL) */
+ .difseg_size = 12,
+ .frame_rate = 25,
+ .frame_rate_base = 1,
+ .ltc_divisor = 25,
+ .height = 576,
+ .width = 720,
+ .sar = {{59, 54}, {118, 81}},
+ .video_place = dv_place_420,
+ .pix_fmt = PIX_FMT_YUV420P,
+ .audio_stride = 108,
+ .audio_min_samples = { 1896, 1742, 1264 }, /* for 48, 44.1 and 32Khz */
+ .audio_samples_dist = { 1920, 1920, 1920, 1920, 1920 },
+ .audio_shuffle = dv_audio_shuffle625,
+ },
+ { .dsf = 1,
+ .frame_size = 144000, /* SMPTE-314M - 625/50 (PAL) */
+ .difseg_size = 12,
+ .frame_rate = 25,
+ .frame_rate_base = 1,
+ .ltc_divisor = 25,
+ .height = 576,
+ .width = 720,
+ .sar = {{59, 54}, {118, 81}},
+ .video_place = dv_place_411P,
+ .pix_fmt = PIX_FMT_YUV411P,
+ .audio_stride = 108,
+ .audio_min_samples = { 1896, 1742, 1264 }, /* for 48, 44.1 and 32Khz */
+ .audio_samples_dist = { 1920, 1920, 1920, 1920, 1920 },
+ .audio_shuffle = dv_audio_shuffle625,
+ }
};
+
+static inline const DVprofile* dv_frame_profile(uint8_t* frame)
+{
+ if ((frame[3] & 0x80) == 0) { /* DSF flag */
+ return &dv_profiles[0];
+ }
+ else if ((frame[5] & 0x07) == 0) { /* APT flag */
+ return &dv_profiles[1];
+ }
+ else
+ return &dv_profiles[2];
+}
+
+static inline const DVprofile* dv_codec_profile(AVCodecContext* codec)
+{
+ if (codec->width != 720) {
+ return NULL;
+ }
+ else if (codec->height == 480) {
+ return &dv_profiles[0];
+ }
+ else
+ return &dv_profiles[1];
+}
projects / ffmpeg / blobdiff