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* DV handling was streamlined for both muxing/demuxing and

Browse Source 
decoding. All muxing/demuxing functionality is now available
     in libavformat/dv.[ch].

   * dv1394.c and avidec.c were hooked up with general DV demuxer.

   * DVAUDIO is dead! Long live pcm_s16le!

   * DV audio is now always recognized -- which means we can
     now hear all those ducks quaking in pond.dv.

Originally committed as revision 2319 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roman Shaposhnik 2003-09-29 17:54:07 +00:00
parent da64ecc3e7
commit 7458ccbb02
9 changed files with 1035 additions and 533 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
libavcodec/allcodecs.c
View File

@ -103,7 +103,6 @@ void avcodec_register_all(void)
register_avcodec(&mpeg_xvmc_decoder);
#endif
register_avcodec(&dvvideo_decoder);
register_avcodec(&dvaudio_decoder);
register_avcodec(&mjpeg_decoder);
register_avcodec(&mjpegb_decoder);
register_avcodec(&mp2_decoder);

1
libavcodec/avcodec.h
View File

@ -1388,7 +1388,6 @@ extern AVCodec rv10_decoder;
extern AVCodec svq1_decoder;
extern AVCodec svq3_decoder;
extern AVCodec dvvideo_decoder;
extern AVCodec dvaudio_decoder;
extern AVCodec wmav1_decoder;
extern AVCodec wmav2_decoder;
extern AVCodec mjpeg_decoder;

331
libavcodec/dv.c
View File

@ -25,34 +25,29 @@
#include "dsputil.h"
#include "mpegvideo.h"
#include "simple_idct.h"
#define NTSC_FRAME_SIZE 120000
#define PAL_FRAME_SIZE 144000
#define TEX_VLC_BITS 9
#include "dvdata.h"
typedef struct DVVideoDecodeContext {
AVCodecContext *avctx;
const DVprofile* sys;
GetBitContext gb;
VLC *vlc;
int sampling_411; /* 0 = 420, 1 = 411 */
int width, height;
uint8_t *current_picture[3]; /* picture structure */
AVFrame picture;
int linesize[3];
DCTELEM block[5*6][64] __align8;
/* FIXME: the following is extracted from DSP */
uint8_t dv_zigzag[2][64];
uint8_t idct_permutation[64];
void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
void (*fdct)(DCTELEM *block);
/* XXX: move it to static storage ? */
uint8_t dv_shift[2][22][64];
void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
} DVVideoDecodeContext;
#include "dvdata.h"
static VLC dv_vlc;
#define TEX_VLC_BITS 9
/* XXX: also include quantization */
static RL_VLC_ELEM *dv_rl_vlc[1];
static VLC_TYPE dv_vlc_codes[15][23];
static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
{
@ -85,6 +80,7 @@ static int dvvideo_decode_init(AVCodecContext *avctx)
if (!done) {
int i;
VLC dv_vlc;
done = 1;
@ -114,6 +110,12 @@ static int dvvideo_decode_init(AVCodecContext *avctx)
dv_rl_vlc[0][i].level = level;
dv_rl_vlc[0][i].run = run;
}
memset(dv_vlc_codes, 0xff, sizeof(dv_vlc_codes));
for (i = 0; i < NB_DV_VLC - 1; i++) {
if (dv_vlc_run[i] < 15 && dv_vlc_level[i] < 23 && dv_vlc_len[i] < 15)
dv_vlc_codes[dv_vlc_run[i]][dv_vlc_level[i]] = i;
}
}
/* ugly way to get the idct & scantable */
@ -124,6 +126,9 @@ static int dvvideo_decode_init(AVCodecContext *avctx)
if (DCT_common_init(&s2) < 0)
return -1;
s->get_pixels = s2.dsp.get_pixels;
s->fdct = s2.dsp.fdct;
s->idct_put[0] = s2.dsp.idct_put;
memcpy(s->idct_permutation, s2.dsp.idct_permutation, 64);
memcpy(s->dv_zigzag[0], s2.intra_scantable.permutated, 64);
@ -134,11 +139,11 @@ static int dvvideo_decode_init(AVCodecContext *avctx)
/* XXX: do it only for constant case */
dv_build_unquantize_tables(s);
return 0;
}
//#define VLC_DEBUG
// #define VLC_DEBUG
typedef struct BlockInfo {
const uint8_t *shift_table;
@ -450,29 +455,29 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
v = *mb_pos_ptr++;
mb_x = v & 0xff;
mb_y = v >> 8;
y_ptr = s->current_picture[0] + (mb_y * s->linesize[0] * 8) + (mb_x * 8);
if (s->sampling_411)
c_offset = (mb_y * s->linesize[1] * 8) + ((mb_x >> 2) * 8);
y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8);
if (s->sys->pix_fmt == PIX_FMT_YUV411P)
c_offset = (mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8);
else
c_offset = ((mb_y >> 1) * s->linesize[1] * 8) + ((mb_x >> 1) * 8);
c_offset = ((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8);
for(j = 0;j < 6; j++) {
idct_put = s->idct_put[mb->dct_mode];
if (j < 4) {
if (s->sampling_411 && mb_x < (704 / 8)) {
if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {
/* NOTE: at end of line, the macroblock is handled as 420 */
idct_put(y_ptr + (j * 8), s->linesize[0], block);
idct_put(y_ptr + (j * 8), s->picture.linesize[0], block);
} else {
idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->linesize[0]),
s->linesize[0], block);
idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]),
s->picture.linesize[0], block);
}
} else {
if (s->sampling_411 && mb_x >= (704 / 8)) {
if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
uint8_t pixels[64], *c_ptr, *c_ptr1, *ptr;
int y, linesize;
/* NOTE: at end of line, the macroblock is handled as 420 */
idct_put(pixels, 8, block);
linesize = s->linesize[6 - j];
c_ptr = s->current_picture[6 - j] + c_offset;
linesize = s->picture.linesize[6 - j];
c_ptr = s->picture.data[6 - j] + c_offset;
ptr = pixels;
for(y = 0;y < 8; y++) {
/* convert to 411P */
@ -486,8 +491,8 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
}
} else {
/* don't ask me why they inverted Cb and Cr ! */
idct_put(s->current_picture[6 - j] + c_offset,
s->linesize[6 - j], block);
idct_put(s->picture.data[6 - j] + c_offset,
s->picture.linesize[6 - j], block);
}
}
block += 64;
@ -496,7 +501,6 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
}
}
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
144000 bytes for PAL) */
static int dvvideo_decode_frame(AVCodecContext *avctx,
@ -504,115 +508,35 @@ static int dvvideo_decode_frame(AVCodecContext *avctx,
uint8_t *buf, int buf_size)
{
DVVideoDecodeContext *s = avctx->priv_data;
int sct, dsf, apt, ds, nb_dif_segs, vs, width, height, i, packet_size;
uint8_t *buf_ptr;
int ds, vs;
const uint16_t *mb_pos_ptr;
/* parse id */
init_get_bits(&s->gb, buf, buf_size*8);
sct = get_bits(&s->gb, 3);
if (sct != 0)
return -1;
skip_bits(&s->gb, 5);
get_bits(&s->gb, 4); /* dsn (sequence number */
get_bits(&s->gb, 1); /* fsc (channel number) */
skip_bits(&s->gb, 3);
get_bits(&s->gb, 8); /* dbn (diff block number 0-134) */
dsf = get_bits(&s->gb, 1); /* 0 = NTSC 1 = PAL */
if (get_bits(&s->gb, 1) != 0)
return -1;
skip_bits(&s->gb, 11);
apt = get_bits(&s->gb, 3); /* apt */
get_bits(&s->gb, 1); /* tf1 */
skip_bits(&s->gb, 4);
get_bits(&s->gb, 3); /* ap1 */
get_bits(&s->gb, 1); /* tf2 */
skip_bits(&s->gb, 4);
get_bits(&s->gb, 3); /* ap2 */
get_bits(&s->gb, 1); /* tf3 */
skip_bits(&s->gb, 4);
get_bits(&s->gb, 3); /* ap3 */
/* init size */
width = 720;
if (dsf) {
avctx->frame_rate = 25;
avctx->frame_rate_base = 1;
packet_size = PAL_FRAME_SIZE;
height = 576;
nb_dif_segs = 12;
} else {
avctx->frame_rate = 30000;
avctx->frame_rate_base = 1001;
packet_size = NTSC_FRAME_SIZE;
height = 480;
nb_dif_segs = 10;
}
/* NOTE: we only accept several full frames */
if (buf_size < packet_size)
return -1;
/* NTSC[dsf == 0] is always 720x480, 4:1:1
* PAL[dsf == 1] is always 720x576, 4:2:0 for IEC 68134[apt == 0]
* but for the SMPTE 314M[apt == 1] it is 720x576, 4:1:1
*/
s->sampling_411 = !dsf || apt;
if (s->sampling_411) {
mb_pos_ptr = dsf ? dv_place_411P : dv_place_411;
avctx->pix_fmt = PIX_FMT_YUV411P;
} else {
mb_pos_ptr = dv_place_420;
avctx->pix_fmt = PIX_FMT_YUV420P;
}
avctx->width = width;
avctx->height = height;
/* Once again, this is pretty complicated by the fact that the same
* field is used differently by IEC 68134[apt == 0] and
* SMPTE 314M[apt == 1].
*/
if (buf[VAUX_TC61_OFFSET] == 0x61 &&
((apt == 0 && (buf[VAUX_TC61_OFFSET + 2] & 0x07) == 0x07) ||
(apt == 1 && (buf[VAUX_TC61_OFFSET + 2] & 0x07) == 0x02)))
avctx->aspect_ratio = 16.0 / 9.0;
else
avctx->aspect_ratio = 4.0 / 3.0;
s->sys = dv_frame_profile(buf);
if (!s->sys || buf_size < s->sys->frame_size)
return -1; /* NOTE: we only accept several full frames */
if(s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
s->picture.reference= 0;
s->picture.reference = 0;
avctx->pix_fmt = s->sys->pix_fmt;
if(avctx->get_buffer(avctx, &s->picture) < 0) {
fprintf(stderr, "get_buffer() failed\n");
return -1;
}
for(i=0;i<3;i++) {
s->current_picture[i] = s->picture.data[i];
s->linesize[i] = s->picture.linesize[i];
if (!s->current_picture[i])
return -1;
}
s->width = width;
s->height = height;
/* for each DIF segment */
buf_ptr = buf;
for (ds = 0; ds < nb_dif_segs; ds++) {
buf_ptr += 6 * 80; /* skip DIF segment header */
mb_pos_ptr = s->sys->video_place;
for (ds = 0; ds < s->sys->difseg_size; ds++) {
buf += 6 * 80; /* skip DIF segment header */
for(vs = 0; vs < 27; vs++) {
if ((vs % 3) == 0) {
/* skip audio block */
buf_ptr += 80;
}
dv_decode_video_segment(s, buf_ptr, mb_pos_ptr);
buf_ptr += 5 * 80;
if ((vs % 3) == 0)
buf += 80; /* skip audio block */
dv_decode_video_segment(s, buf, mb_pos_ptr);
buf += 5 * 80;
mb_pos_ptr += 5;
}
}
@ -623,7 +547,7 @@ static int dvvideo_decode_frame(AVCodecContext *avctx,
*data_size = sizeof(AVFrame);
*(AVFrame*)data= s->picture;
return packet_size;
return s->sys->frame_size;
}
static int dvvideo_decode_end(AVCodecContext *avctx)
@ -645,158 +569,3 @@ AVCodec dvvideo_decoder = {
CODEC_CAP_DR1,
NULL
};
typedef struct DVAudioDecodeContext {
AVCodecContext *avctx;
GetBitContext gb;
} DVAudioDecodeContext;
static int dvaudio_decode_init(AVCodecContext *avctx)
{
// DVAudioDecodeContext *s = avctx->priv_data;
return 0;
}
static uint16_t dv_audio_12to16(uint16_t sample)
{
uint16_t shift, result;
sample = (sample < 0x800) ? sample : sample | 0xf000;
shift = (sample & 0xf00) >> 8;
if (shift < 0x2 || shift > 0xd) {
result = sample;
} else if (shift < 0x8) {
shift--;
result = (sample - (256 * shift)) << shift;
} else {
shift = 0xe - shift;
result = ((sample + ((256 * shift) + 1)) << shift) - 1;
}
return result;
}
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
144000 bytes for PAL)
There's a couple of assumptions being made here:
1. By default we silence erroneous (0x8000/16bit 0x800/12bit)
audio samples. We can pass them upwards when ffmpeg will be ready
to deal with them.
2. We don't do software emphasis.
3. Audio is always returned as 16bit linear samples: 12bit
nonlinear samples are converted into 16bit linear ones.
*/
static int dvaudio_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
DVVideoDecodeContext *s = avctx->priv_data;
const uint16_t (*unshuffle)[9];
int smpls, freq, quant, sys, stride, difseg, ad, dp, nb_dif_segs, i;
uint16_t lc, rc;
uint8_t *buf_ptr;
/* parse id */
init_get_bits(&s->gb, &buf[AAUX_AS_OFFSET], 5*8);
i = get_bits(&s->gb, 8);
if (i != 0x50) { /* No audio ? */
*data_size = 0;
return buf_size;
}
get_bits(&s->gb, 1); /* 0 - locked audio, 1 - unlocked audio */
skip_bits(&s->gb, 1);
smpls = get_bits(&s->gb, 6); /* samples in this frame - min. samples */
skip_bits(&s->gb, 8);
skip_bits(&s->gb, 2);
sys = get_bits(&s->gb, 1); /* 0 - 60 fields, 1 = 50 fields */
skip_bits(&s->gb, 5);
get_bits(&s->gb, 1); /* 0 - emphasis on, 1 - emphasis off */
get_bits(&s->gb, 1); /* 0 - reserved, 1 - emphasis time constant 50/15us */
freq = get_bits(&s->gb, 3); /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
quant = get_bits(&s->gb, 3); /* 0 - 16bit linear, 1 - 12bit nonlinear */
if (quant > 1)
return -1; /* Unsupported quantization */
avctx->sample_rate = dv_audio_frequency[freq];
avctx->channels = 2;
avctx->bit_rate = avctx->channels * avctx->sample_rate * 16;
// What about:
// avctx->frame_size =
*data_size = (dv_audio_min_samples[sys][freq] + smpls) *
avctx->channels * 2;
if (sys) {
nb_dif_segs = 12;
stride = 108;
unshuffle = dv_place_audio50;
} else {
nb_dif_segs = 10;
stride = 90;
unshuffle = dv_place_audio60;
}
/* for each DIF segment */
buf_ptr = buf;
for (difseg = 0; difseg < nb_dif_segs; difseg++) {
buf_ptr += 6 * 80; /* skip DIF segment header */
for (ad = 0; ad < 9; ad++) {
for (dp = 8; dp < 80; dp+=2) {
if (quant == 0) { /* 16bit quantization */
i = unshuffle[difseg][ad] + (dp - 8)/2 * stride;
((short *)data)[i] = (buf_ptr[dp] << 8) | buf_ptr[dp+1];
if (((unsigned short *)data)[i] == 0x8000)
((short *)data)[i] = 0;
} else { /* 12bit quantization */
if (difseg >= nb_dif_segs/2)
goto out; /* We're not doing 4ch at this time */
lc = ((uint16_t)buf_ptr[dp] << 4) |
((uint16_t)buf_ptr[dp+2] >> 4);
rc = ((uint16_t)buf_ptr[dp+1] << 4) |
((uint16_t)buf_ptr[dp+2] & 0x0f);
lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
i = unshuffle[difseg][ad] + (dp - 8)/3 * stride;
((short *)data)[i] = lc;
i = unshuffle[difseg+nb_dif_segs/2][ad] + (dp - 8)/3 * stride;
((short *)data)[i] = rc;
++dp;
}
}
buf_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
}
}
out:
return buf_size;
}
static int dvaudio_decode_end(AVCodecContext *avctx)
{
// DVAudioDecodeContext *s = avctx->priv_data;
return 0;
}
AVCodec dvaudio_decoder = {
"dvaudio",
CODEC_TYPE_AUDIO,
CODEC_ID_DVAUDIO,
sizeof(DVAudioDecodeContext),
dvaudio_decode_init,
NULL,
dvaudio_decode_end,
dvaudio_decode_frame,
0,
NULL
};

114
libavcodec/dvdata.h
View File

@ -21,11 +21,34 @@
* @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 */
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)
static const uint16_t dv_vlc_bits[409] = {
0x0000, 0x0002, 0x0007, 0x0008, 0x0009, 0x0014, 0x0015, 0x0016,
@ -283,7 +306,7 @@ static const uint8_t dv_248_areas[64] = {
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 },
@ -1240,7 +1263,7 @@ static const uint16_t dv_place_411[1350] = {
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 },
@ -1254,7 +1277,7 @@ static const uint16_t dv_place_audio60[10][9] = {
{ 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},
@ -1271,10 +1294,77 @@ static const uint16_t dv_place_audio50[12][9] = {
};
static const int dv_audio_frequency[3] = {
48000, 44100, 32000,
48000, 44100, 32000,
};
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,
.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,
.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,
.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 const int dv_audio_min_samples[2][3] = {
{ 1580, 1452, 1053 }, /* 60 fields */
{ 1896, 1742, 1264 }, /* 50 fileds */
};
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];
}

2
libavformat/Makefile
View File

@ -13,7 +13,7 @@ PPOBJS=
# mux and demuxes
OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o raw.o rm.o \
avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dvcore.o dv.o \
avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dv.o \
yuv4mpeg.o 4xm.o flvenc.o flvdec.o movenc.o psxstr.o idroq.o ipmovie.o \
nut.o wc3movie.o mp3.o

140
libavformat/avidec.c
View File

@ -18,21 +18,10 @@
*/
#include "avformat.h"
#include "avi.h"
#include "dv.h"
//#define DEBUG
static const struct AVI1Handler {
enum CodecID vcid;
enum CodecID acid;
uint32_t tag;
} AVI1Handlers[] = {
{ CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'd') },
{ CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 'h', 'd') },
{ CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'l') },
/* This is supposed to be the last one */
{ CODEC_ID_NONE, CODEC_ID_NONE, 0 },
};
typedef struct AVIIndex {
unsigned char tag[4];
unsigned int flags, pos, len;
@ -40,14 +29,11 @@ typedef struct AVIIndex {
} AVIIndex;
typedef struct {
int64_t riff_end;
int64_t movi_end;
int type;
uint8_t *buf;
int buf_size;
int stream_index;
int64_t riff_end;
int64_t movi_end;
offset_t movi_list;
AVIIndex *first, *last;
void* dv_demux;
} AVIContext;
#ifdef DEBUG
@ -97,11 +83,6 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
stream_index = -1;
codec_type = -1;
frame_period = 0;
avi->type = 2;
avi->buf = av_malloc(1);
if (!avi->buf)
return -1;
avi->buf_size = 1;
for(;;) {
if (url_feof(pb))
goto fail;
@ -134,7 +115,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
url_fskip(pb, 4 * 4);
n = get_le32(pb);
for(i=0;i<n;i++) {
st = av_new_stream(s, 0);
st = av_new_stream(s, i);
if (!st)
goto fail;
}
@ -144,24 +125,36 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
/* stream header */
stream_index++;
tag1 = get_le32(pb);
handler = get_le32(pb); /* codec tag */
switch(tag1) {
case MKTAG('i', 'a', 'v', 's'):
case MKTAG('i', 'v', 'a', 's'):
/*
* After some consideration -- I don't think we
* have to support anything but DV in a type1 AVIs.
*/
if (s->nb_streams != 1)
goto fail;
avi->type = 1;
avi->stream_index = 0;
if (handler != MKTAG('d', 'v', 's', 'd') &&
handler != MKTAG('d', 'v', 'h', 'd') &&
handler != MKTAG('d', 'v', 's', 'l'))
goto fail;
avi->dv_demux = dv_init_demux(s, stream_index, stream_index + 1);
if (!avi->dv_demux)
goto fail;
stream_index++;
case MKTAG('v', 'i', 'd', 's'):
codec_type = CODEC_TYPE_VIDEO;
if (stream_index >= s->nb_streams) {
url_fskip(pb, size - 4);
url_fskip(pb, size - 8);
break;
}
st = s->streams[stream_index];
handler = get_le32(pb); /* codec tag */
get_le32(pb); /* flags */
get_le16(pb); /* priority */
get_le16(pb); /* language */
@ -186,29 +179,6 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
st->codec.frame_rate_base * AV_TIME_BASE /
st->codec.frame_rate;
if (avi->type == 1) {
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
goto fail;
stream_index++;
for (i=0; AVI1Handlers[i].tag != 0; ++i)
if (AVI1Handlers[i].tag == handler)
break;
if (AVI1Handlers[i].tag != 0) {
s->streams[0]->codec.codec_type = CODEC_TYPE_VIDEO;
s->streams[0]->codec.codec_id = AVI1Handlers[i].vcid;
s->streams[1]->codec.codec_type = CODEC_TYPE_AUDIO;
s->streams[1]->codec.codec_id = AVI1Handlers[i].acid;
} else {
goto fail;
}
}
url_fskip(pb, size - 9 * 4);
break;
case MKTAG('a', 'u', 'd', 's'):
@ -218,12 +188,11 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
codec_type = CODEC_TYPE_AUDIO;
if (stream_index >= s->nb_streams) {
url_fskip(pb, size - 4);
url_fskip(pb, size - 8);
break;
}
st = s->streams[stream_index];
get_le32(pb); /* tag */
get_le32(pb); /* flags */
get_le16(pb); /* priority */
get_le16(pb); /* language */
@ -244,7 +213,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
break;
case MKTAG('s', 't', 'r', 'f'):
/* stream header */
if (stream_index >= s->nb_streams || avi->type == 1) {
if (stream_index >= s->nb_streams || avi->dv_demux) {
url_fskip(pb, size);
} else {
st = s->streams[stream_index];
@ -305,7 +274,6 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
/* check stream number */
if (stream_index != s->nb_streams - 1) {
fail:
av_free(avi->buf);
for(i=0;i<s->nb_streams;i++) {
av_freep(&s->streams[i]->codec.extradata);
av_freep(&s->streams[i]);
@ -316,31 +284,21 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
return 0;
}
static void __destruct_pkt(struct AVPacket *pkt)
{
pkt->data = NULL; pkt->size = 0;
return;
}
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIContext *avi = s->priv_data;
ByteIOContext *pb = &s->pb;
int n, d[8], size, i;
void* dstr;
memset(d, -1, sizeof(int)*8);
if (avi->type == 1 && avi->stream_index) {
/* duplicate DV packet */
av_init_packet(pkt);
pkt->data = avi->buf;
pkt->size = avi->buf_size;
pkt->destruct = __destruct_pkt;
pkt->stream_index = avi->stream_index;
avi->stream_index = !avi->stream_index;
return 0;
if (avi->dv_demux) {
size = dv_get_packet(avi->dv_demux, pkt);
if (size >= 0)
return size;
}
for(i=url_ftell(pb); !url_feof(pb); i++) {
int j;
@ -387,26 +345,24 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
&& n < s->nb_streams
&& i + size <= avi->movi_end) {
if (avi->type == 1) {
uint8_t *tbuf = av_realloc(avi->buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!tbuf)
return -1;
avi->buf = tbuf;
avi->buf_size = size;
av_init_packet(pkt);
pkt->data = avi->buf;
pkt->size = avi->buf_size;
pkt->destruct = __destruct_pkt;
avi->stream_index = n;
} else {
av_new_packet(pkt, size);
}
av_new_packet(pkt, size);
get_buffer(pb, pkt->data, size);
if (size & 1)
if (size & 1) {
get_byte(pb);
pkt->stream_index = n;
pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read index for that
return 0;
size++;
}
if (avi->dv_demux) {
dstr = pkt->destruct;
size = dv_produce_packet(avi->dv_demux, pkt,
pkt->data, pkt->size);
pkt->destruct = dstr;
} else {
pkt->stream_index = n;
pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read
// index for that
}
return size;
}
}
return -1;
@ -416,7 +372,6 @@ static int avi_read_close(AVFormatContext *s)
{
int i;
AVIContext *avi = s->priv_data;
av_free(avi->buf);
for(i=0;i<s->nb_streams;i++) {
AVStream *st = s->streams[i];
@ -424,6 +379,9 @@ static int avi_read_close(AVFormatContext *s)
av_free(st->codec.extradata);
}
if (avi->dv_demux)
av_free(avi->dv_demux);
return 0;
}

841
libavformat/dv.c
View File

@ -1,4 +1,10 @@
/*
* General DV muxer/demuxer
* Copyright (c) 2003 Roman Shaposhnick
*
* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
* of DV technical info.
*
* Raw DV format
* Copyright (c) 2002 Fabrice Bellard.
*
@ -16,38 +22,696 @@
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <time.h>
#include "avformat.h"
#include "dvcore.h"
#include "dvdata.h"
typedef struct DVDemuxContext {
int is_audio;
uint8_t buf[144000];
int size;
AVPacket audio_pkt;
AVStream *vst;
AVStream *ast;
} DVDemuxContext;
/* raw input */
static int dv_read_header(AVFormatContext *s,
AVFormatParameters *ap)
typedef struct DVMuxContext {
const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
uint8_t frame_buf[144000]; /* frame under contruction */
FifoBuffer audio_data; /* Fifo for storing excessive amounts of PCM */
int frames; /* Number of a current frame */
time_t start_time; /* Start time of recording */
uint8_t aspect; /* Aspect ID 0 - 4:3, 7 - 16:9 */
int has_audio; /* frame under contruction has audio */
int has_video; /* frame under contruction has video */
} DVMuxContext;
enum dv_section_type {
dv_sect_header = 0x1f,
dv_sect_subcode = 0x3f,
dv_sect_vaux = 0x56,
dv_sect_audio = 0x76,
dv_sect_video = 0x96,
};
enum dv_pack_type {
dv_header525 = 0x3f, /* see dv_write_pack for important details on */
dv_header625 = 0xbf, /* these two packs */
dv_timecode = 0x13,
dv_audio_source = 0x50,
dv_audio_control = 0x51,
dv_audio_recdate = 0x52,
dv_audio_rectime = 0x53,
dv_video_source = 0x60,
dv_video_control = 0x61,
dv_viedo_recdate = 0x62,
dv_video_rectime = 0x63,
dv_unknown_pack = 0xff,
};
/*
* The reason why the following three big ugly looking tables are
* here is my lack of DV spec IEC 61834. The tables were basically
* constructed to make code that places packs in SSYB, VAUX and
* AAUX blocks very simple and table-driven. They conform to the
* SMPTE 314M and the output of my personal DV camcorder, neither
* of which is sufficient for a reliable DV stream producing. Thus
* while code is still in development I'll be gathering input from
* people with different DV equipment and modifying the tables to
* accommodate all the quirks. Later on, if possible, some of them
* will be folded into smaller tables and/or switch-if logic. For
* now, my only excuse is -- they don't eat up that much of a space.
*/
static const int dv_ssyb_packs_dist[12][6] = {
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
};
static const int dv_vaux_packs_dist[12][15] = {
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
};
static const int dv_aaux_packs_dist[12][9] = {
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
};
static inline uint16_t dv_audio_12to16(uint16_t sample)
{
AVStream *vst, *ast;
DVDemuxContext *c = s->priv_data;
uint16_t shift, result;
sample = (sample < 0x800) ? sample : sample | 0xf000;
shift = (sample & 0xf00) >> 8;
vst = av_new_stream(s, 0);
if (!vst)
return AVERROR_NOMEM;
vst->codec.codec_type = CODEC_TYPE_VIDEO;
vst->codec.codec_id = CODEC_ID_DVVIDEO;
vst->codec.bit_rate = 25000000;
if (shift < 0x2 || shift > 0xd) {
result = sample;
} else if (shift < 0x8) {
shift--;
result = (sample - (256 * shift)) << shift;
} else {
shift = 0xe - shift;
result = ((sample + ((256 * shift) + 1)) << shift) - 1;
}
ast = av_new_stream(s, 1);
if (!ast)
return AVERROR_NOMEM;
return result;
}
ast->codec.codec_type = CODEC_TYPE_AUDIO;
ast->codec.codec_id = CODEC_ID_DVAUDIO;
c->is_audio = 0;
static int dv_audio_frame_size(const DVprofile* sys, int frame)
{
return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/
sizeof(sys->audio_samples_dist[0]))];
}
return 0;
static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf)
{
struct tm tc;
time_t ct;
int ltc_frame;
buf[0] = (uint8_t)pack_id;
switch (pack_id) {
case dv_header525: /* I can't imagine why these two weren't defined as real */
case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */
buf[1] = 0xf8 | /* reserved -- always 1 */
(0 & 0x07); /* APT: Track application ID */
buf[2] = (0 << 7) | /* TF1: audio data is 0 - valid; 1 - invalid */
(0x0f << 3) | /* reserved -- always 1 */
(0 & 0x07); /* AP1: Audio application ID */
buf[3] = (0 << 7) | /* TF2: video data is 0 - valid; 1 - invalid */
(0x0f << 3) | /* reserved -- always 1 */
(0 & 0x07); /* AP2: Video application ID */
buf[4] = (0 << 7) | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */
(0x0f << 3) | /* reserved -- always 1 */
(0 & 0x07); /* AP3: Subcode application ID */
break;
case dv_timecode:
ct = (time_t)(c->frames / ((float)c->sys->frame_rate /
(float)c->sys->frame_rate_base));
localtime_r(&ct, &tc);
/*
* LTC drop-frame frame counter drops two frames (0 and 1) every
* minute, unless it is exactly divisible by 10
*/
ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
(1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
((ltc_frame / 10) << 4) | /* Tens of frames */
(ltc_frame % 10); /* Units of frames */
buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
((tc.tm_sec / 10) << 4) | /* Tens of seconds */
(tc.tm_sec % 10); /* Units of seconds */
buf[3] = (1 << 7) | /* Binary group flag BGF0 */
((tc.tm_min / 10) << 4) | /* Tens of minutes */
(tc.tm_min % 10); /* Units of minutes */
buf[4] = (1 << 7) | /* Binary group flag BGF2 */
(1 << 6) | /* Binary group flag BGF1 */
((tc.tm_hour / 10) << 4) | /* Tens of hours */
(tc.tm_hour % 10); /* Units of hours */
break;
case dv_audio_source: /* AAUX source pack */
buf[1] = (0 << 7) | /* locked mode */
(1 << 6) | /* reserved -- always 1 */
(dv_audio_frame_size(c->sys, c->frames) -
c->sys->audio_min_samples[0]);
/* # of samples */
buf[2] = (0 << 7) | /* multi-stereo */
(0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
(0 << 4) | /* pair bit: 0 -- one pair of channels */
0; /* audio mode */
buf[3] = (1 << 7) | /* res */
(1 << 6) | /* multi-language flag */
(c->sys->dsf << 5) | /* system: 60fields/50fields */
0; /* definition: 0 -- SD (525/625) */
buf[4] = (1 << 7) | /* emphasis: 1 -- off */
(0 << 6) | /* emphasis time constant: 0 -- reserved */
(0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
break;
case dv_audio_control:
buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
(1 << 4) | /* input source: 1 -- digital input */
(3 << 2) | /* compression: 3 -- no information */
0; /* misc. info/SMPTE emphasis off */
buf[2] = (1 << 7) | /* recording start point: 1 -- no */
(1 << 6) | /* recording end point: 1 -- no */
(1 << 3) | /* recording mode: 1 -- original */
7;
buf[3] = (1 << 7) | /* direction: 1 -- forward */
0x20; /* speed */
buf[4] = (1 << 7) | /* reserved -- always 1 */
0x7f; /* genre category */
break;
case dv_audio_recdate:
case dv_viedo_recdate: /* VAUX recording date */
ct = c->start_time + (time_t)(c->frames /
((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
localtime_r(&ct, &tc);
buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
/* 0xff is very likely to be "unknown" */
buf[2] = (3 << 6) | /* reserved -- always 1 */
((tc.tm_mday / 10) << 4) | /* Tens of day */
(tc.tm_mday % 10); /* Units of day */
buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
(tc.tm_mon % 10); /* Units of month */
buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
(tc.tm_year % 10); /* Units of year */
break;
case dv_audio_rectime: /* AAUX recording time */
case dv_video_rectime: /* VAUX recording time */
ct = c->start_time + (time_t)(c->frames /
((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
localtime_r(&ct, &tc);
buf[1] = (3 << 6) | /* reserved -- always 1 */
0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
buf[2] = (1 << 7) | /* reserved -- always 1 */
((tc.tm_sec / 10) << 4) | /* Tens of seconds */
(tc.tm_sec % 10); /* Units of seconds */
buf[3] = (1 << 7) | /* reserved -- always 1 */
((tc.tm_min / 10) << 4) | /* Tens of minutes */
(tc.tm_min % 10); /* Units of minutes */
buf[4] = (3 << 6) | /* reserved -- always 1 */
((tc.tm_hour / 10) << 4) | /* Tens of hours */
(tc.tm_hour % 10); /* Units of hours */
break;
case dv_video_source:
buf[1] = 0xff; /* reserved -- always 1 */
buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
(1 << 6) | /* following CLF is valid - 0, invalid - 1 */
(3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */
0xf; /* reserved -- always 1 */
buf[3] = (3 << 6) | /* reserved -- always 1 */
(c->sys->dsf << 5) | /* system: 60fields/50fields */
0; /* signal type video compression */
buf[4] = 0xff; /* VISC: 0xff -- no information */
break;
case dv_video_control:
buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
0x3f; /* reserved -- always 1 */
buf[2] = 0xc8 | /* reserved -- always b11001xxx */
c->aspect;
buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */
(1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */
(1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */
(1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
0xc; /* reserved -- always b1100 */
buf[4] = 0xff; /* reserved -- always 1 */
break;
default:
buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
}
return 5;
}
static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num,
uint8_t dif_num, uint8_t* buf)
{
buf[0] = (uint8_t)t; /* Section type */
buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
(0 << 3) | /* FSC: for 50Mb/s 0 - first channel; 1 - second */
7; /* reserved -- always 1 */
buf[2] = dif_num; /* DIF block number Video: 0-134, Audio: 0-8 */
return 3;
}
static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
{
if (syb_num == 0 || syb_num == 6) {
buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
(0<<4) | /* AP3 (Subcode application ID) */
0x0f; /* reserved -- always 1 */
}
else if (syb_num == 11) {
buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
0x7f; /* reserved -- always 1 */
}
else {
buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
(0<<4) | /* APT (Track application ID) */
0x0f; /* reserved -- always 1 */
}
buf[1] = 0xf0 | /* reserved -- always 1 */
(syb_num & 0x0f); /* SSYB number 0 - 11 */
buf[2] = 0xff; /* reserved -- always 1 */
return 3;
}
static void dv_format_frame(DVMuxContext *c, uint8_t* buf)
{
int i, j, k;
for (i = 0; i < c->sys->difseg_size; i++) {
memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */
/* DV header: 1DIF */
buf += dv_write_dif_id(dv_sect_header, i, 0, buf);
buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
buf += 72; /* unused bytes */
/* DV subcode: 2DIFs */
for (j = 0; j < 2; j++) {
buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);
for (k = 0; k < 6; k++) {
buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
}
buf += 29; /* unused bytes */
}
/* DV VAUX: 3DIFs */
for (j = 0; j < 3; j++) {
buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
for (k = 0; k < 15 ; k++)
buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
buf += 2; /* unused bytes */
}
/* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
for (j = 0; j < 135; j++) {
if (j%15 == 0) {
buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
buf += dv_write_pack(dv_aaux_packs_dist[i][j/15], c, buf);
buf += 72; /* shuffled PCM audio */
}
buf += dv_write_dif_id(dv_sect_video, i, j, buf);
buf += 77; /* 1 video macro block: 1 bytes control
4 * 14 bytes Y 8x8 data
10 bytes Cr 8x8 data
10 bytes Cb 8x8 data */
}
}
}
static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)
{
int i, j, d, of;
for (i = 0; i < c->sys->difseg_size; i++) {
frame_ptr += 6 * 80; /* skip DIF segment header */
for (j = 0; j < 9; j++) {
for (d = 8; d < 80; d+=2) {
of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
frame_ptr[d+1] = pcm[of*2]; // that DV is a big endian PCM
}
frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
}
}
}
static void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)
{
int i, j;
int ptr = 0;
for (i = 0; i < c->sys->difseg_size; i++) {
ptr += 6 * 80; /* skip DIF segment header */
for (j = 0; j < 135; j++) {
if (j%15 == 0)
ptr += 80; /* skip Audio DIF */
ptr += 3;
memcpy(frame_ptr + ptr, video_data + ptr, 77);
ptr += 77;
}
}
}
/*
* This is the dumbest implementation of all -- it simply looks at
* a fixed offset and if pack isn't there -- fails. We might want
* to have a fallback mechanism for complete search of missing packs.
*/
static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
{
int offs;
switch (t) {
case dv_audio_source:
offs = (80*6 + 80*16*3 + 3);
break;
case dv_audio_control:
offs = (80*6 + 80*16*4 + 3);
break;
case dv_video_control:
offs = (80*5 + 48 + 5);
break;
default:
return NULL;
}
return (frame[offs] == t ? &frame[offs] : NULL);
}
/*
* There's a couple of assumptions being made here:
* 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
* We can pass them upwards when ffmpeg will be ready to deal with them.
* 2. We don't do software emphasis.
* 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
* are converted into 16bit linear ones.
*/
static int dv_extract_audio(uint8_t* frame, uint8_t* pcm)
{
int size, i, j, d, of, smpls, freq, quant;
uint16_t lc, rc;
const DVprofile* sys;
const uint8_t* as_pack;
as_pack = dv_extract_pack(frame, dv_audio_source);
if (!as_pack) /* No audio ? */
return 0;
sys = dv_frame_profile(frame);
smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
if (quant > 1)
return -1; /* Unsupported quantization */
size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
/* for each DIF segment */
for (i = 0; i < sys->difseg_size; i++) {
frame += 6 * 80; /* skip DIF segment header */
for (j = 0; j < 9; j++) {
for (d = 8; d < 80; d += 2) {
if (quant == 0) { /* 16bit quantization */
of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
if (of*2 >= size)
continue;
pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
pcm[of*2+1] = frame[d]; // that DV is a big endian PCM
if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
pcm[of*2+1] = 0;
} else { /* 12bit quantization */
if (i >= sys->difseg_size/2)
goto out; /* We're not doing 4ch at this time */
lc = ((uint16_t)frame[d] << 4) |
((uint16_t)frame[d+2] >> 4);
rc = ((uint16_t)frame[d+1] << 4) |
((uint16_t)frame[d+2] & 0x0f);
lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
of = sys->audio_shuffle[i][j] + (d - 8)/3 * sys->audio_stride;
if (of*2 >= size)
continue;
pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit
pcm[of*2+1] = lc >> 8; // that DV is a big endian PCM
of = sys->audio_shuffle[i+sys->difseg_size/2][j] +
(d - 8)/3 * sys->audio_stride;
pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit
pcm[of*2+1] = rc >> 8; // that DV is a big endian PCM
++d;
}
}
frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
}
}
out:
return size;
}
static int dv_extract_audio_info(uint8_t* frame, AVCodecContext* avctx)
{
const uint8_t* as_pack;
const DVprofile* sys;
int freq, smpls;
sys = dv_frame_profile(frame);
as_pack = dv_extract_pack(frame, dv_audio_source);
if (!as_pack || !sys) /* No audio ? */
return -1;
smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
avctx->sample_rate = dv_audio_frequency[freq];
avctx->channels = 2;
avctx->bit_rate = avctx->channels * avctx->sample_rate * 16;
return (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
}
static int dv_extract_video_info(uint8_t* frame, AVCodecContext* avctx)
{
const DVprofile* sys;
const uint8_t* vsc_pack;
int apt;
int size = 0;
sys = dv_frame_profile(frame);
if (sys) {
apt = frame[4] & 0x07;
avctx->frame_rate = sys->frame_rate;
avctx->frame_rate_base = sys->frame_rate_base;
avctx->width = sys->width;
avctx->height = sys->height;
avctx->pix_fmt = sys->pix_fmt;
vsc_pack = dv_extract_pack(frame, dv_video_control);
if (vsc_pack && (vsc_pack[2] & 0x07) == (apt?0x02:0x07))
avctx->aspect_ratio = 16.0 / 9.0;
else
avctx->aspect_ratio = 4.0 / 3.0;
size = sys->frame_size;
}
return size;
}
/*
* The following 6 functions constitute our interface to the world
*/
int dv_assemble_frame(DVMuxContext *c, AVStream* st,
const uint8_t* data, int data_size, uint8_t** frame)
{
uint8_t pcm[8192];
int fsize, reqasize;
*frame = &c->frame_buf[0];
if (c->has_audio && c->has_video) { /* must be a stale frame */
dv_format_frame(c, *frame);
c->frames++;
c->has_audio = c->has_video = 0;
}
if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
/* FIXME: we have to have more sensible approach than this one */
if (c->has_video)
fprintf(stderr, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
dv_inject_video(c, data, *frame);
c->has_video = 1;
data_size = 0;
}
reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
if (st->codec.codec_type == CODEC_TYPE_AUDIO || (c->has_video && fsize >= reqasize)) {
if (fsize + data_size >= reqasize && !c->has_audio) {
if (fsize >= reqasize) {
fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
} else {
fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
memcpy(&pcm[fsize], &data[0], reqasize - fsize);
data += reqasize - fsize;
data_size -= reqasize - fsize;
}
dv_inject_audio(c, &pcm[0], *frame);
c->has_audio = 1;
}
/* FIXME: we have to have more sensible approach than this one */
if (fifo_size(&c->audio_data, c->audio_data.rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
fprintf(stderr, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);
}
return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;
}
DVMuxContext* dv_init_mux(AVFormatContext* s)
{
DVMuxContext *c;
AVStream *vst;
AVStream *ast;
c = av_mallocz(sizeof(DVMuxContext));
if (!c)
return NULL;
if (s->nb_streams != 2)
goto bail_out;
/* We have to sort out where audio and where video stream is */
if (s->streams[0]->codec.codec_type == CODEC_TYPE_VIDEO &&
s->streams[1]->codec.codec_type == CODEC_TYPE_AUDIO) {
vst = s->streams[0];
ast = s->streams[1];
}
else if (s->streams[1]->codec.codec_type == CODEC_TYPE_VIDEO &&
s->streams[0]->codec.codec_type == CODEC_TYPE_AUDIO) {
vst = s->streams[1];
ast = s->streams[0];
} else
goto bail_out;
/* Some checks -- DV format is very picky about its incoming streams */
if (vst->codec.codec_id != CODEC_ID_DVVIDEO ||
ast->codec.codec_id != CODEC_ID_PCM_S16LE)
goto bail_out;
if (ast->codec.sample_rate != 48000 ||
ast->codec.channels != 2)
goto bail_out;
c->sys = dv_codec_profile(&vst->codec);
if (!c->sys)
goto bail_out;
/* Ok, everything seems to be in working order */
c->frames = 0;
c->has_audio = c->has_video = 0;
c->start_time = time(NULL);
c->aspect = 0; /* 4:3 is the default */
if (vst->codec.aspect_ratio == 16.0 / 9.0)
c->aspect = 0x07;
if (fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
goto bail_out;
dv_format_frame(c, &c->frame_buf[0]);
return c;
bail_out:
av_free(c);
return NULL;
}
void dv_delete_mux(DVMuxContext *c)
{
fifo_free(&c->audio_data);
av_free(c);
}
DVDemuxContext* dv_init_demux(AVFormatContext *s, int vid, int aid)
{
DVDemuxContext *c;
c = av_mallocz(sizeof(DVDemuxContext));
if (!c)
return NULL;
c->vst = (vid < s->nb_streams) ? s->streams[vid] : av_new_stream(s, vid);
c->ast = (aid < s->nb_streams) ? s->streams[aid] : av_new_stream(s, aid);
if (!c->vst || !c->ast)
goto fail;
c->vst->codec.codec_type = CODEC_TYPE_VIDEO;
c->vst->codec.codec_id = CODEC_ID_DVVIDEO;
c->vst->codec.bit_rate = 25000000;
c->ast->codec.codec_type = CODEC_TYPE_AUDIO;
c->ast->codec.codec_id = CODEC_ID_PCM_S16LE;
c->audio_pkt.size = 0;
return c;
fail:
if (c->vst)
av_free(c->vst);
if (c->ast)
av_free(c->ast);
av_free(c);
return NULL;
}
static void __destruct_pkt(struct AVPacket *pkt)
@ -56,43 +720,99 @@ static void __destruct_pkt(struct AVPacket *pkt)
return;
}
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
{
int ret;
DVDemuxContext *c = s->priv_data;
if (!c->is_audio) {
ret = get_buffer(&s->pb, c->buf, 4);
if (ret <= 0)
return -EIO;
c->size = dv_frame_profile(&c->buf[0])->frame_size;
ret = get_buffer(&s->pb, c->buf + 4, c->size - 4);
if (ret <= 0)
return -EIO;
int size = -1;
if (c->audio_pkt.size) {
*pkt = c->audio_pkt;
c->audio_pkt.size = 0;
size = pkt->size;
}
return size;
}
int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
uint8_t* buf, int buf_size)
{
int size;
if (buf_size < 4 || buf_size < dv_frame_profile(buf)->frame_size)
return -1; /* Broken frame, or not enough data */
/* Queueing audio packet */
/* FIXME: in case of no audio/bad audio we have to do something */
size = dv_extract_audio_info(buf, &c->ast->codec);
if (av_new_packet(&c->audio_pkt, size) < 0)
return AVERROR_NOMEM;
dv_extract_audio(buf, c->audio_pkt.data);
c->audio_pkt.size = size;
c->audio_pkt.stream_index = c->ast->id;
/* Now it's time to return video packet */
size = dv_extract_video_info(buf, &c->vst->codec);
av_init_packet(pkt);
pkt->destruct = __destruct_pkt;
pkt->data = c->buf;
pkt->size = c->size;
pkt->stream_index = c->is_audio;
pkt->data = buf;
pkt->size = size;
pkt->flags |= PKT_FLAG_KEY;
pkt->stream_index = c->vst->id;
c->is_audio = !c->is_audio;
return c->size;
return size;
}
/************************************************************
* Implementation of the easiest DV storage of all -- raw DV.
************************************************************/
typedef struct RawDVContext {
void* dv_demux;
uint8_t buf[144000];
} RawDVContext;
static int dv_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
RawDVContext *c = s->priv_data;
c->dv_demux = dv_init_demux(s, 0, 1);
return c->dv_demux ? 0 : -1;
}
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int size;
RawDVContext *c = s->priv_data;
size = dv_get_packet(c->dv_demux, pkt);
if (size < 0) {
if (get_buffer(&s->pb, c->buf, 4) <= 0)
return -EIO;
size = dv_frame_profile(c->buf)->frame_size;
if (get_buffer(&s->pb, c->buf + 4, size - 4) <= 0)
return -EIO;
size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);
}
return size;
}
static int dv_read_close(AVFormatContext *s)
{
RawDVContext *c = s->priv_data;
av_free(c->dv_demux);
return 0;
}
int dv_write_header(struct AVFormatContext *s)
static int dv_write_header(AVFormatContext *s)
{
DVMuxContext *c = s->priv_data;
if (s->nb_streams != 2 || dv_core_init(c, s->streams) != 0) {
s->priv_data = dv_init_mux(s);
if (!s->priv_data) {
fprintf(stderr, "Can't initialize DV format!\n"
"Make sure that you supply exactly two streams:\n"
" video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
@ -101,23 +821,20 @@ int dv_write_header(struct AVFormatContext *s)
return 0;
}
int dv_write_packet(struct AVFormatContext *s,
int stream_index,
const uint8_t *buf, int size, int64_t pts)
static int dv_write_packet(struct AVFormatContext *s,
int stream_index,
const uint8_t *buf, int size, int64_t pts)
{
DVMuxContext *c = s->priv_data;
uint8_t* frame;
int fsize;
if (stream_index == c->vst)
dv_assemble_frame(c, buf, NULL, 0);
else
dv_assemble_frame(c, NULL, buf, size);
if (c->has_audio && c->has_video) {
put_buffer(&s->pb, &c->frame_buf[0], c->sys->frame_size);
fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[stream_index],
buf, size, &frame);
if (fsize > 0) {
put_buffer(&s->pb, frame, fsize);
put_flush_packet(&s->pb);
}
return 0;
}
return fsize;
}
/*
@ -126,16 +843,16 @@ int dv_write_packet(struct AVFormatContext *s,
* Currently we simply drop the last frame. I don't know whether this
* is the best strategy of all
*/
int dv_write_trailer(struct AVFormatContext *s)
static int dv_write_trailer(struct AVFormatContext *s)
{
dv_core_delete((DVMuxContext *)s->priv_data);
dv_delete_mux((DVMuxContext *)s->priv_data);
return 0;
}
static AVInputFormat dv_iformat = {
"dv",
"DV video format",
sizeof(DVDemuxContext),
sizeof(RawDVContext),
NULL,
dv_read_header,
dv_read_packet,
@ -143,7 +860,7 @@ static AVInputFormat dv_iformat = {
.extensions = "dv",
};
AVOutputFormat dv_oformat = {
static AVOutputFormat dv_oformat = {
"dv",
"DV video format",
NULL,

32
libavformat/dv.h Normal file
View File

@ -0,0 +1,32 @@
/*
* General DV muxer/demuxer
* Copyright (c) 2003 Roman Shaposhnick
*
* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
* of DV technical info.
*
* Raw DV format
* Copyright (c) 2002 Fabrice Bellard.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
void* dv_init_demux(AVFormatContext *s, int vid, int aid);
int dv_get_packet(void*, AVPacket *);
int dv_produce_packet(void*, AVPacket*, uint8_t*, int);
void* dv_init_mux(AVFormatContext* s);
int dv_assemble_frame(void *c, AVStream*, const uint8_t*, int, uint8_t**);
void dv_delete_mux(void*);

106
libavformat/dv1394.c
View File

@ -31,13 +31,11 @@
#undef DV1394_DEBUG
#include "dv1394.h"
#include "dv.h"
struct dv1394_data {
int fd;
int channel;
int width, height;
int frame_rate;
int frame_size;
int format;
void *ring; /* Ring buffer */
@ -45,9 +43,9 @@ struct dv1394_data {
int avail; /* Number of frames available for reading */
int done; /* Number of completed frames */
int stream; /* Current stream. 0 - video, 1 - audio */
int64_t pts; /* Current timestamp */
AVStream *vst, *ast;
void* dv_demux; /* Generic DV muxing/demuxing context */
};
/*
@ -69,7 +67,6 @@ static int dv1394_reset(struct dv1394_data *dv)
return -1;
dv->avail = dv->done = 0;
dv->stream = 0;
return 0;
}
@ -88,14 +85,9 @@ static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap
struct dv1394_data *dv = context->priv_data;
const char *video_device;
dv->vst = av_new_stream(context, 0);
if (!dv->vst)
return -ENOMEM;
dv->ast = av_new_stream(context, 1);
if (!dv->ast) {
av_free(dv->vst);
return -ENOMEM;
}
dv->dv_demux = dv_init_demux(context, 0, 1);
if (!dv->dv_demux)
goto failed;
if (ap->standard && !strcasecmp(ap->standard, "pal"))
dv->format = DV1394_PAL;
@ -107,17 +99,6 @@ static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap
else
dv->channel = DV1394_DEFAULT_CHANNEL;
dv->width = DV1394_WIDTH;
if (dv->format == DV1394_NTSC) {
dv->height = DV1394_NTSC_HEIGHT;
dv->frame_size = DV1394_NTSC_FRAME_SIZE;
dv->frame_rate = 30;
} else {
dv->height = DV1394_PAL_HEIGHT;
dv->frame_size = DV1394_PAL_FRAME_SIZE;
dv->frame_rate = 25;
}
/* Open and initialize DV1394 device */
video_device = ap->device;
if (!video_device)
@ -140,21 +121,6 @@ static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap
goto failed;
}
dv->stream = 0;
dv->vst->codec.codec_type = CODEC_TYPE_VIDEO;
dv->vst->codec.codec_id = CODEC_ID_DVVIDEO;
dv->vst->codec.width = dv->width;
dv->vst->codec.height = dv->height;
dv->vst->codec.frame_rate = dv->frame_rate;
dv->vst->codec.frame_rate_base = 1;
dv->vst->codec.bit_rate = 25000000; /* Consumer DV is 25Mbps */
dv->ast->codec.codec_type = CODEC_TYPE_AUDIO;
dv->ast->codec.codec_id = CODEC_ID_DVAUDIO;
dv->ast->codec.channels = 2;
dv->ast->codec.sample_rate= 48000;
av_set_pts_info(context, 48, 1, 1000000);
if (dv1394_start(dv) < 0)
@ -164,55 +130,17 @@ static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap
failed:
close(dv->fd);
av_free(dv->vst);
av_free(dv->ast);
return -EIO;
}
static void __destruct_pkt(struct AVPacket *pkt)
{
pkt->data = NULL; pkt->size = 0;
return;
}
static inline int __get_frame(struct dv1394_data *dv, AVPacket *pkt)
{
char *ptr = dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE);
if (dv->stream) {
dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
dv->done++; dv->avail--;
} else {
dv->pts = av_gettime() & ((1LL << 48) - 1);
}
dv->format = ((ptr[3] & 0x80) == 0) ? DV1394_NTSC : DV1394_PAL;
if (dv->format == DV1394_NTSC) {
dv->frame_size = DV1394_NTSC_FRAME_SIZE;
dv->vst->codec.height = dv->height = DV1394_NTSC_HEIGHT;
dv->vst->codec.frame_rate = dv->frame_rate = 30;
} else {
dv->frame_size = DV1394_PAL_FRAME_SIZE;
dv->vst->codec.height = dv->height = DV1394_PAL_HEIGHT;
dv->vst->codec.frame_rate = dv->frame_rate = 25;
}
av_init_packet(pkt);
pkt->destruct = __destruct_pkt;
pkt->data = ptr;
pkt->size = dv->frame_size;
pkt->pts = dv->pts;
pkt->stream_index = dv->stream;
pkt->flags |= PKT_FLAG_KEY;
dv->stream ^= 1;
return dv->frame_size;
}
static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
{
struct dv1394_data *dv = context->priv_data;
int size;
size = dv_get_packet(dv->dv_demux, pkt);
if (size > 0)
goto out;
if (!dv->avail) {
struct dv1394_status s;
@ -276,7 +204,16 @@ restart_poll:
dv->done);
#endif
return __get_frame(dv, pkt);
size = dv_produce_packet(dv->dv_demux, pkt,
dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE),
DV1394_PAL_FRAME_SIZE);
dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
dv->done++; dv->avail--;
dv->pts = av_gettime() & ((1LL << 48) - 1);
out:
pkt->pts = dv->pts;
return size;
}
static int dv1394_close(AVFormatContext * context)
@ -292,6 +229,7 @@ static int dv1394_close(AVFormatContext * context)
perror("Failed to munmap DV1394 ring buffer");
close(dv->fd);
av_free(dv->dv_demux);
return 0;
}