+++ /dev/null
-/*
- * DV decoder
- * 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
- */
-
-/**
- * @file dv.c
- * DV decoder.
- */
-#include "avcodec.h"
-#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
-
-typedef struct DVVideoDecodeContext {
- AVCodecContext *avctx;
- 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;
- uint8_t dv_zigzag[2][64];
- uint8_t idct_permutation[64];
- /* 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;
-/* XXX: also include quantization */
-static RL_VLC_ELEM *dv_rl_vlc[1];
-
-static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
-{
- int i, q, j;
-
- /* NOTE: max left shift is 6 */
- for(q = 0; q < 22; q++) {
- /* 88 unquant */
- for(i = 1; i < 64; i++) {
- /* 88 table */
- j = s->idct_permutation[i];
- s->dv_shift[0][q][j] =
- dv_quant_shifts[q][dv_88_areas[i]] + 1;
- }
-
- /* 248 unquant */
- for(i = 1; i < 64; i++) {
- /* 248 table */
- s->dv_shift[1][q][i] =
- dv_quant_shifts[q][dv_248_areas[i]] + 1;
- }
- }
-}
-
-static int dvvideo_decode_init(AVCodecContext *avctx)
-{
- DVVideoDecodeContext *s = avctx->priv_data;
- MpegEncContext s2;
- static int done=0;
-
- if (!done) {
- int i;
-
- done = 1;
-
- /* NOTE: as a trick, we use the fact the no codes are unused
- to accelerate the parsing of partial codes */
- init_vlc(&dv_vlc, TEX_VLC_BITS, NB_DV_VLC,
- dv_vlc_len, 1, 1, dv_vlc_bits, 2, 2);
-
- dv_rl_vlc[0] = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM));
- for(i = 0; i < dv_vlc.table_size; i++){
- int code= dv_vlc.table[i][0];
- int len = dv_vlc.table[i][1];
- int level, run;
-
- if(len<0){ //more bits needed
- run= 0;
- level= code;
- } else if (code == (NB_DV_VLC - 1)) {
- /* EOB */
- run = 0;
- level = 256;
- } else {
- run= dv_vlc_run[code] + 1;
- level= dv_vlc_level[code];
- }
- dv_rl_vlc[0][i].len = len;
- dv_rl_vlc[0][i].level = level;
- dv_rl_vlc[0][i].run = run;
- }
- }
-
- /* ugly way to get the idct & scantable */
- /* XXX: fix it */
- memset(&s2, 0, sizeof(MpegEncContext));
- s2.avctx = avctx;
- dsputil_init(&s2.dsp, avctx);
- if (DCT_common_init(&s2) < 0)
- return -1;
-
- 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);
-
- /* XXX: use MMX also for idct248 */
- s->idct_put[1] = simple_idct248_put;
- memcpy(s->dv_zigzag[1], dv_248_zigzag, 64);
-
- /* XXX: do it only for constant case */
- dv_build_unquantize_tables(s);
-
- return 0;
-}
-
-//#define VLC_DEBUG
-
-typedef struct BlockInfo {
- const uint8_t *shift_table;
- const uint8_t *scan_table;
- uint8_t pos; /* position in block */
- uint8_t eob_reached; /* true if EOB has been reached */
- uint8_t dct_mode;
- uint8_t partial_bit_count;
- uint16_t partial_bit_buffer;
- int shift_offset;
-} BlockInfo;
-
-/* block size in bits */
-static const uint16_t block_sizes[6] = {
- 112, 112, 112, 112, 80, 80
-};
-
-#ifndef ALT_BITSTREAM_READER
-#warning only works with ALT_BITSTREAM_READER
-#endif
-
-/* decode ac coefs */
-static void dv_decode_ac(DVVideoDecodeContext *s,
- BlockInfo *mb, DCTELEM *block, int last_index)
-{
- int last_re_index;
- int shift_offset = mb->shift_offset;
- const uint8_t *scan_table = mb->scan_table;
- const uint8_t *shift_table = mb->shift_table;
- int pos = mb->pos;
- int level, pos1, sign, run;
- int partial_bit_count;
-#ifndef ALT_BITSTREAM_READER //FIXME
- int re_index=0;
- int re1_index=0;
-#endif
- OPEN_READER(re, &s->gb);
-
-#ifdef VLC_DEBUG
- printf("start\n");
-#endif
-
- /* if we must parse a partial vlc, we do it here */
- partial_bit_count = mb->partial_bit_count;
- if (partial_bit_count > 0) {
- uint8_t buf[4];
- uint32_t v;
- int l, l1;
- GetBitContext gb1;
-
- /* build the dummy bit buffer */
- l = 16 - partial_bit_count;
- UPDATE_CACHE(re, &s->gb);
-#ifdef VLC_DEBUG
- printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16));
-#endif
- v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l);
- buf[0] = v >> 8;
- buf[1] = v;
-#ifdef VLC_DEBUG
- printf("v=%04x cnt=%d %04x\n",
- v, partial_bit_count, (mb->partial_bit_buffer << l));
-#endif
- /* try to read the codeword */
- init_get_bits(&gb1, buf, 4*8);
- {
- OPEN_READER(re1, &gb1);
- UPDATE_CACHE(re1, &gb1);
- GET_RL_VLC(level, run, re1, &gb1, dv_rl_vlc[0],
- TEX_VLC_BITS, 2);
- l = re1_index;
- CLOSE_READER(re1, &gb1);
- }
-#ifdef VLC_DEBUG
- printf("****run=%d level=%d size=%d\n", run, level, l);
-#endif
- /* compute codeword length */
- l1 = (level != 256 && level != 0);
- /* if too long, we cannot parse */
- l -= partial_bit_count;
- if ((re_index + l + l1) > last_index)
- return;
- /* skip read bits */
- last_re_index = 0; /* avoid warning */
- re_index += l;
- /* by definition, if we can read the vlc, all partial bits
- will be read (otherwise we could have read the vlc before) */
- mb->partial_bit_count = 0;
- UPDATE_CACHE(re, &s->gb);
- goto handle_vlc;
- }
-
- /* get the AC coefficients until last_index is reached */
- for(;;) {
- UPDATE_CACHE(re, &s->gb);
-#ifdef VLC_DEBUG
- printf("%2d: bits=%04x index=%d\n",
- pos, SHOW_UBITS(re, &s->gb, 16), re_index);
-#endif
- last_re_index = re_index;
- GET_RL_VLC(level, run, re, &s->gb, dv_rl_vlc[0],
- TEX_VLC_BITS, 2);
- handle_vlc:
-#ifdef VLC_DEBUG
- printf("run=%d level=%d\n", run, level);
-#endif
- if (level == 256) {
- if (re_index > last_index) {
- cannot_read:
- /* put position before read code */
- re_index = last_re_index;
- mb->eob_reached = 0;
- break;
- }
- /* EOB */
- mb->eob_reached = 1;
- break;
- } else if (level != 0) {
- if ((re_index + 1) > last_index)
- goto cannot_read;
- sign = SHOW_SBITS(re, &s->gb, 1);
- level = (level ^ sign) - sign;
- LAST_SKIP_BITS(re, &s->gb, 1);
- pos += run;
- /* error */
- if (pos >= 64) {
- goto read_error;
- }
- pos1 = scan_table[pos];
- level = level << (shift_table[pos1] + shift_offset);
- block[pos1] = level;
- // printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]);
- } else {
- if (re_index > last_index)
- goto cannot_read;
- /* level is zero: means run without coding. No
- sign is coded */
- pos += run;
- /* error */
- if (pos >= 64) {
- read_error:
-#if defined(VLC_DEBUG) || 1
- fprintf(stderr, "error pos=%d\n", pos);
-#endif
- /* for errors, we consider the eob is reached */
- mb->eob_reached = 1;
- break;
- }
- }
- }
- CLOSE_READER(re, &s->gb);
- mb->pos = pos;
-}
-
-static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left)
-{
- while (bits_left >= 16) {
- put_bits(pb, 16, get_bits(gb, 16));
- bits_left -= 16;
- }
- if (bits_left > 0) {
- put_bits(pb, bits_left, get_bits(gb, bits_left));
- }
-}
-
-/* mb_x and mb_y are in units of 8 pixels */
-static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
- uint8_t *buf_ptr1,
- const uint16_t *mb_pos_ptr)
-{
- int quant, dc, dct_mode, class1, j;
- int mb_index, mb_x, mb_y, v, last_index;
- DCTELEM *block, *block1;
- int c_offset, bits_left;
- uint8_t *y_ptr;
- BlockInfo mb_data[5 * 6], *mb, *mb1;
- void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
- uint8_t *buf_ptr;
- PutBitContext pb, vs_pb;
- uint8_t mb_bit_buffer[80 + 4]; /* allow some slack */
- int mb_bit_count;
- uint8_t vs_bit_buffer[5 * 80 + 4]; /* allow some slack */
- int vs_bit_count;
-
- memset(s->block, 0, sizeof(s->block));
-
- /* pass 1 : read DC and AC coefficients in blocks */
- buf_ptr = buf_ptr1;
- block1 = &s->block[0][0];
- mb1 = mb_data;
- init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80, NULL, NULL);
- vs_bit_count = 0;
- for(mb_index = 0; mb_index < 5; mb_index++) {
- /* skip header */
- quant = buf_ptr[3] & 0x0f;
- buf_ptr += 4;
- init_put_bits(&pb, mb_bit_buffer, 80, NULL, NULL);
- mb_bit_count = 0;
- mb = mb1;
- block = block1;
- for(j = 0;j < 6; j++) {
- /* NOTE: size is not important here */
- init_get_bits(&s->gb, buf_ptr, 14*8);
-
- /* get the dc */
- dc = get_bits(&s->gb, 9);
- dc = (dc << (32 - 9)) >> (32 - 9);
- dct_mode = get_bits1(&s->gb);
- mb->dct_mode = dct_mode;
- mb->scan_table = s->dv_zigzag[dct_mode];
- class1 = get_bits(&s->gb, 2);
- mb->shift_offset = (class1 == 3);
- mb->shift_table = s->dv_shift[dct_mode]
- [quant + dv_quant_offset[class1]];
- dc = dc << 2;
- /* convert to unsigned because 128 is not added in the
- standard IDCT */
- dc += 1024;
- block[0] = dc;
- last_index = block_sizes[j];
- buf_ptr += last_index >> 3;
- mb->pos = 0;
- mb->partial_bit_count = 0;
-
- dv_decode_ac(s, mb, block, last_index);
-
- /* write the remaining bits in a new buffer only if the
- block is finished */
- bits_left = last_index - get_bits_count(&s->gb);
- if (mb->eob_reached) {
- mb->partial_bit_count = 0;
- mb_bit_count += bits_left;
- bit_copy(&pb, &s->gb, bits_left);
- } else {
- /* should be < 16 bits otherwise a codeword could have
- been parsed */
- mb->partial_bit_count = bits_left;
- mb->partial_bit_buffer = get_bits(&s->gb, bits_left);
- }
- block += 64;
- mb++;
- }
-
- flush_put_bits(&pb);
-
- /* pass 2 : we can do it just after */
-#ifdef VLC_DEBUG
- printf("***pass 2 size=%d\n", mb_bit_count);
-#endif
- block = block1;
- mb = mb1;
- init_get_bits(&s->gb, mb_bit_buffer, 80*8);
- for(j = 0;j < 6; j++) {
- if (!mb->eob_reached && get_bits_count(&s->gb) < mb_bit_count) {
- dv_decode_ac(s, mb, block, mb_bit_count);
- /* if still not finished, no need to parse other blocks */
- if (!mb->eob_reached) {
- /* we could not parse the current AC coefficient,
- so we add the remaining bytes */
- bits_left = mb_bit_count - get_bits_count(&s->gb);
- if (bits_left > 0) {
- mb->partial_bit_count += bits_left;
- mb->partial_bit_buffer =
- (mb->partial_bit_buffer << bits_left) |
- get_bits(&s->gb, bits_left);
- }
- goto next_mb;
- }
- }
- block += 64;
- mb++;
- }
- /* all blocks are finished, so the extra bytes can be used at
- the video segment level */
- bits_left = mb_bit_count - get_bits_count(&s->gb);
- vs_bit_count += bits_left;
- bit_copy(&vs_pb, &s->gb, bits_left);
- next_mb:
- mb1 += 6;
- block1 += 6 * 64;
- }
-
- /* we need a pass other the whole video segment */
- flush_put_bits(&vs_pb);
-
-#ifdef VLC_DEBUG
- printf("***pass 3 size=%d\n", vs_bit_count);
-#endif
- block = &s->block[0][0];
- mb = mb_data;
- init_get_bits(&s->gb, vs_bit_buffer, 5 * 80*8);
- for(mb_index = 0; mb_index < 5; mb_index++) {
- for(j = 0;j < 6; j++) {
- if (!mb->eob_reached) {
-#ifdef VLC_DEBUG
- printf("start %d:%d\n", mb_index, j);
-#endif
- dv_decode_ac(s, mb, block, vs_bit_count);
- }
- block += 64;
- mb++;
- }
- }
-
- /* compute idct and place blocks */
- block = &s->block[0][0];
- mb = mb_data;
- for(mb_index = 0; mb_index < 5; mb_index++) {
- 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);
- else
- c_offset = ((mb_y >> 1) * s->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)) {
- /* NOTE: at end of line, the macroblock is handled as 420 */
- idct_put(y_ptr + (j * 8), s->linesize[0], block);
- } else {
- idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->linesize[0]),
- s->linesize[0], block);
- }
- } else {
- if (s->sampling_411 && 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;
- ptr = pixels;
- for(y = 0;y < 8; y++) {
- /* convert to 411P */
- c_ptr1 = c_ptr + 8*linesize;
- c_ptr[0]= ptr[0]; c_ptr1[0]= ptr[4];
- c_ptr[1]= ptr[1]; c_ptr1[1]= ptr[5];
- c_ptr[2]= ptr[2]; c_ptr1[2]= ptr[6];
- c_ptr[3]= ptr[3]; c_ptr1[3]= ptr[7];
- c_ptr += linesize;
- ptr += 8;
- }
- } 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);
- }
- }
- block += 64;
- mb++;
- }
- }
-}
-
-
-/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
- 144000 bytes for PAL) */
-static int dvvideo_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- 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;
- 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;
-
- if(s->picture.data[0])
- avctx->release_buffer(avctx, &s->picture);
-
- s->picture.reference= 0;
- 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 */
-
- 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;
- mb_pos_ptr += 5;
- }
- }
-
- emms_c();
-
- /* return image */
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data= s->picture;
-
- return packet_size;
-}
-
-static int dvvideo_decode_end(AVCodecContext *avctx)
-{
- avcodec_default_free_buffers(avctx);
-
- return 0;
-}
-
-AVCodec dvvideo_decoder = {
- "dvvideo",
- CODEC_TYPE_VIDEO,
- CODEC_ID_DVVIDEO,
- sizeof(DVVideoDecodeContext),
- dvvideo_decode_init,
- NULL,
- dvvideo_decode_end,
- dvvideo_decode_frame,
- 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
-};
projects / synfig.git / blobdiff