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/*
* Indeo Video Interactive v4 compatible decoder
* Copyright (c) 2009-2011 Maxim Poliakovski
*
* This file is part of Libav.
*
* Libav 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 2.1 of the License, or (at your option) any later version.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Indeo Video Interactive version 4 decoder
*
* Indeo 4 data is usually transported within .avi or .mov files.
* Known FOURCCs: 'IV41'
*/
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "ivi_dsp.h"
#include "ivi_common.h"
#include "indeo4data.h"
/**
* Indeo 4 frame types.
*/
enum {
FRAMETYPE_INTRA = 0,
FRAMETYPE_INTRA1 = 1, ///< intra frame with slightly different bitstream coding
FRAMETYPE_INTER = 2, ///< non-droppable P-frame
FRAMETYPE_BIDIR = 3, ///< bidirectional frame
FRAMETYPE_INTER_NOREF = 4, ///< droppable P-frame
FRAMETYPE_NULL_FIRST = 5, ///< empty frame with no data
FRAMETYPE_NULL_LAST = 6 ///< empty frame with no data
};
#define IVI4_PIC_SIZE_ESC 7
static const struct {
InvTransformPtr *inv_trans;
DCTransformPtr *dc_trans;
int is_2d_trans;
} transforms[18] = {
{ ff_ivi_inverse_haar_8x8, ff_ivi_dc_haar_2d, 1 },
{ NULL, NULL, 0 }, /* inverse Haar 8x1 */
{ NULL, NULL, 0 }, /* inverse Haar 1x8 */
{ ff_ivi_put_pixels_8x8, ff_ivi_put_dc_pixel_8x8, 1 },
{ ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d, 1 },
{ ff_ivi_row_slant8, ff_ivi_dc_row_slant, 1 },
{ ff_ivi_col_slant8, ff_ivi_dc_col_slant, 1 },
{ NULL, NULL, 0 }, /* inverse DCT 8x8 */
{ NULL, NULL, 0 }, /* inverse DCT 8x1 */
{ NULL, NULL, 0 }, /* inverse DCT 1x8 */
{ NULL, NULL, 0 }, /* inverse Haar 4x4 */
{ ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d, 1 },
{ NULL, NULL, 0 }, /* no transform 4x4 */
{ NULL, NULL, 0 }, /* inverse Haar 1x4 */
{ NULL, NULL, 0 }, /* inverse Haar 4x1 */
{ NULL, NULL, 0 }, /* inverse slant 1x4 */
{ NULL, NULL, 0 }, /* inverse slant 4x1 */
{ NULL, NULL, 0 }, /* inverse DCT 4x4 */
};
/**
* Decode subdivision of a plane.
* This is a simplified version that checks for two supported subdivisions:
* - 1 wavelet band per plane, size factor 1:1, code pattern: 3
* - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3
* Anything else is either unsupported or corrupt.
*
* @param[in,out] gb the GetBit context
* @return number of wavelet bands or 0 on error
*/
static int decode_plane_subdivision(GetBitContext *gb)
{
int i;
switch (get_bits(gb, 2)) {
case 3:
return 1;
case 2:
for (i = 0; i < 4; i++)
if (get_bits(gb, 2) != 3)
return 0;
return 4;
default:
return 0;
}
}
static inline int scale_tile_size(int def_size, int size_factor)
{
return size_factor == 15 ? def_size : (size_factor + 1) << 5;
}
/**
* Decode Indeo 4 picture header.
*
* @param[in,out] ctx pointer to the decoder context
* @param[in] avctx pointer to the AVCodecContext
* @return result code: 0 = OK, negative number = error
*/
static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
{
int pic_size_indx, i, p;
IVIPicConfig pic_conf;
if (get_bits(&ctx->gb, 18) != 0x3FFF8) {
av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
return AVERROR_INVALIDDATA;
}
ctx->prev_frame_type = ctx->frame_type;
ctx->frame_type = get_bits(&ctx->gb, 3);
if (ctx->frame_type == 7) {
av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);
return AVERROR_INVALIDDATA;
}
#if IVI4_STREAM_ANALYSER
if (ctx->frame_type == FRAMETYPE_BIDIR)
ctx->has_b_frames = 1;
#endif
ctx->transp_status = get_bits1(&ctx->gb);
#if IVI4_STREAM_ANALYSER
if (ctx->transp_status) {
ctx->has_transp = 1;
}
#endif
/* unknown bit: Mac decoder ignores this bit, XANIM returns error */
if (get_bits1(&ctx->gb)) {
av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");
return AVERROR_INVALIDDATA;
}
ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;
/* null frames don't contain anything else so we just return */
if (ctx->frame_type >= FRAMETYPE_NULL_FIRST) {
av_dlog(avctx, "Null frame encountered!\n");
return 0;
}
/* Check key lock status. If enabled - ignore lock word. */
/* Usually we have to prompt the user for the password, but */
/* we don't do that because Indeo 4 videos can be decoded anyway */
if (get_bits1(&ctx->gb)) {
skip_bits_long(&ctx->gb, 32);
av_dlog(avctx, "Password-protected clip!\n");
}
pic_size_indx = get_bits(&ctx->gb, 3);
if (pic_size_indx == IVI4_PIC_SIZE_ESC) {
pic_conf.pic_height = get_bits(&ctx->gb, 16);
pic_conf.pic_width = get_bits(&ctx->gb, 16);
} else {
pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];
pic_conf.pic_width = ivi4_common_pic_sizes[pic_size_indx * 2 ];
}
/* Decode tile dimensions. */
if (get_bits1(&ctx->gb)) {
pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));
pic_conf.tile_width = scale_tile_size(pic_conf.pic_width, get_bits(&ctx->gb, 4));
#if IVI4_STREAM_ANALYSER
ctx->uses_tiling = 1;
#endif
} else {
pic_conf.tile_height = pic_conf.pic_height;
pic_conf.tile_width = pic_conf.pic_width;
}
/* Decode chroma subsampling. We support only 4:4 aka YVU9. */
if (get_bits(&ctx->gb, 2)) {
av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");
return AVERROR_INVALIDDATA;
}
pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;
/* decode subdivision of the planes */
pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);
if (pic_conf.luma_bands)
pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);
ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
pic_conf.luma_bands, pic_conf.chroma_bands);
return AVERROR_INVALIDDATA;
}
/* check if picture layout was changed and reallocate buffers */
if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
if (ff_ivi_init_planes(ctx->planes, &pic_conf)) {
av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
return AVERROR(ENOMEM);
}
ctx->pic_conf = pic_conf;
/* set default macroblock/block dimensions */
for (p = 0; p <= 2; p++) {
for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4;
ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;
}
}
if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width,
ctx->pic_conf.tile_height)) {
av_log(avctx, AV_LOG_ERROR,
"Couldn't reallocate internal structures!\n");
return AVERROR(ENOMEM);
}
}
ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;
/* skip decTimeEst field if present */
if (get_bits1(&ctx->gb))
skip_bits(&ctx->gb, 8);
/* decode macroblock and block huffman codebooks */
if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) ||
ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))
return AVERROR_INVALIDDATA;
ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
ctx->in_imf = get_bits1(&ctx->gb);
ctx->in_q = get_bits1(&ctx->gb);
ctx->pic_glob_quant = get_bits(&ctx->gb, 5);
/* TODO: ignore this parameter if unused */
ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;
ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;
/* skip picture header extension if any */
while (get_bits1(&ctx->gb)) {
av_dlog(avctx, "Pic hdr extension encountered!\n");
skip_bits(&ctx->gb, 8);
}
if (get_bits1(&ctx->gb)) {
av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");
}
align_get_bits(&ctx->gb);
return 0;
}
/**
* Decode Indeo 4 band header.
*
* @param[in,out] ctx pointer to the decoder context
* @param[in,out] band pointer to the band descriptor
* @param[in] avctx pointer to the AVCodecContext
* @return result code: 0 = OK, negative number = error
*/
static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
AVCodecContext *avctx)
{
int plane, band_num, indx, transform_id, scan_indx;
int i;
int quant_mat;
plane = get_bits(&ctx->gb, 2);
band_num = get_bits(&ctx->gb, 4);
if (band->plane != plane || band->band_num != band_num) {
av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");
return AVERROR_INVALIDDATA;
}
band->is_empty = get_bits1(&ctx->gb);
if (!band->is_empty) {
/* skip header size
* If header size is not given, header size is 4 bytes. */
if (get_bits1(&ctx->gb))
skip_bits(&ctx->gb, 16);
band->is_halfpel = get_bits(&ctx->gb, 2);
if (band->is_halfpel >= 2) {
av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",
band->is_halfpel);
return AVERROR_INVALIDDATA;
}
#if IVI4_STREAM_ANALYSER
if (!band->is_halfpel)
ctx->uses_fullpel = 1;
#endif
band->checksum_present = get_bits1(&ctx->gb);
if (band->checksum_present)
band->checksum = get_bits(&ctx->gb, 16);
indx = get_bits(&ctx->gb, 2);
if (indx == 3) {
av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");
return AVERROR_INVALIDDATA;
}
band->mb_size = 16 >> indx;
band->blk_size = 8 >> (indx >> 1);
band->inherit_mv = get_bits1(&ctx->gb);
band->inherit_qdelta = get_bits1(&ctx->gb);
band->glob_quant = get_bits(&ctx->gb, 5);
if (!get_bits1(&ctx->gb) || ctx->frame_type == FRAMETYPE_INTRA) {
transform_id = get_bits(&ctx->gb, 5);
if (transform_id >= FF_ARRAY_ELEMS(transforms) ||
!transforms[transform_id].inv_trans) {
av_log_ask_for_sample(avctx, "Unimplemented transform: %d!\n", transform_id);
return AVERROR_PATCHWELCOME;
}
if ((transform_id >= 7 && transform_id <= 9) ||
transform_id == 17) {
av_log_ask_for_sample(avctx, "DCT transform not supported yet!\n");
return AVERROR_PATCHWELCOME;
}
if (transform_id < 10 && band->blk_size < 8) {
av_log(avctx, AV_LOG_ERROR, "wrong transform size!\n");
return AVERROR_INVALIDDATA;
}
#if IVI4_STREAM_ANALYSER
if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)
ctx->uses_haar = 1;
#endif
band->inv_transform = transforms[transform_id].inv_trans;
band->dc_transform = transforms[transform_id].dc_trans;
band->is_2d_trans = transforms[transform_id].is_2d_trans;
band->transform_size= (transform_id < 10) ? 8 : 4;
scan_indx = get_bits(&ctx->gb, 4);
if ((scan_indx>4 && scan_indx<10) != (band->blk_size==4)) {
av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
return AVERROR_INVALIDDATA;
}
if (scan_indx == 15) {
av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
return AVERROR_INVALIDDATA;
}
band->scan = scan_index_to_tab[scan_indx];
quant_mat = get_bits(&ctx->gb, 5);
if (quant_mat == 31) {
av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");
return AVERROR_INVALIDDATA;
}
if (quant_mat > 21) {
av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix encountered!\n");
return AVERROR_INVALIDDATA;
}
band->quant_mat = quant_mat;
}
if (quant_index_to_tab[band->quant_mat] > 4 && band->blk_size == 4) {
av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix for 4x4 block encountered!\n");
band->quant_mat = 0;
return AVERROR_INVALIDDATA;
}
/* decode block huffman codebook */
if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF,
&band->blk_vlc, avctx))
return AVERROR_INVALIDDATA;
/* select appropriate rvmap table for this band */
band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
/* decode rvmap probability corrections if any */
band->num_corr = 0; /* there is no corrections */
if (get_bits1(&ctx->gb)) {
band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
if (band->num_corr > 61) {
av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
band->num_corr);
return AVERROR_INVALIDDATA;
}
/* read correction pairs */
for (i = 0; i < band->num_corr * 2; i++)
band->corr[i] = get_bits(&ctx->gb, 8);
}
}
if (band->blk_size == 8) {
band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0];
band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
} else {
band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0];
band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];
}
/* Indeo 4 doesn't use scale tables */
band->intra_scale = NULL;
band->inter_scale = NULL;
align_get_bits(&ctx->gb);
if (!band->scan) {
av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");
return AVERROR_INVALIDDATA;
}
return 0;
}
/**
* Decode information (block type, cbp, quant delta, motion vector)
* for all macroblocks in the current tile.
*
* @param[in,out] ctx pointer to the decoder context
* @param[in,out] band pointer to the band descriptor
* @param[in,out] tile pointer to the tile descriptor
* @param[in] avctx pointer to the AVCodecContext
* @return result code: 0 = OK, negative number = error
*/
static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
IVITile *tile, AVCodecContext *avctx)
{
int x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,
mv_scale, mb_type_bits, s;
IVIMbInfo *mb, *ref_mb;
int row_offset = band->mb_size * band->pitch;
mb = tile->mbs;
ref_mb = tile->ref_mbs;
offs = tile->ypos * band->pitch + tile->xpos;
blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
mb_type_bits = ctx->frame_type == FRAMETYPE_BIDIR ? 2 : 1;
/* scale factor for motion vectors */
mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
mv_x = mv_y = 0;
if (((tile->width + band->mb_size-1)/band->mb_size) * ((tile->height + band->mb_size-1)/band->mb_size) != tile->num_MBs) {
av_log(avctx, AV_LOG_ERROR, "num_MBs mismatch %d %d %d %d\n", tile->width, tile->height, band->mb_size, tile->num_MBs);
return -1;
}
for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {
mb_offset = offs;
for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {
mb->xpos = x;
mb->ypos = y;
mb->buf_offs = mb_offset;
if (get_bits1(&ctx->gb)) {
if (ctx->frame_type == FRAMETYPE_INTRA) {
av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
return AVERROR_INVALIDDATA;
}
mb->type = 1; /* empty macroblocks are always INTER */
mb->cbp = 0; /* all blocks are empty */
mb->q_delta = 0;
if (!band->plane && !band->band_num && ctx->in_q) {
mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
IVI_VLC_BITS, 1);
mb->q_delta = IVI_TOSIGNED(mb->q_delta);
}
mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
if (band->inherit_mv && ref_mb) {
/* motion vector inheritance */
if (mv_scale) {
mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
} else {
mb->mv_x = ref_mb->mv_x;
mb->mv_y = ref_mb->mv_y;
}
}
} else {
if (band->inherit_mv && ref_mb) {
mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
} else if (ctx->frame_type == FRAMETYPE_INTRA ||
ctx->frame_type == FRAMETYPE_INTRA1) {
mb->type = 0; /* mb_type is always INTRA for intra-frames */
} else {
mb->type = get_bits(&ctx->gb, mb_type_bits);
}
mb->cbp = get_bits(&ctx->gb, blks_per_mb);
mb->q_delta = 0;
if (band->inherit_qdelta) {
if (ref_mb) mb->q_delta = ref_mb->q_delta;
} else if (mb->cbp || (!band->plane && !band->band_num &&
ctx->in_q)) {
mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
IVI_VLC_BITS, 1);
mb->q_delta = IVI_TOSIGNED(mb->q_delta);
}
if (!mb->type) {
mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
} else {
if (band->inherit_mv && ref_mb) {
/* motion vector inheritance */
if (mv_scale) {
mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
} else {
mb->mv_x = ref_mb->mv_x;
mb->mv_y = ref_mb->mv_y;
}
} else {
/* decode motion vector deltas */
mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
IVI_VLC_BITS, 1);
mv_y += IVI_TOSIGNED(mv_delta);
mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
IVI_VLC_BITS, 1);
mv_x += IVI_TOSIGNED(mv_delta);
mb->mv_x = mv_x;
mb->mv_y = mv_y;
}
}
}
s= band->is_halfpel;
if (mb->type)
if ( x + (mb->mv_x >>s) + (y+ (mb->mv_y >>s))*band->pitch < 0 ||
x + ((mb->mv_x+s)>>s) + band->mb_size - 1
+ (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize -1) {
av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
return AVERROR_INVALIDDATA;
}
mb++;
if (ref_mb)
ref_mb++;
mb_offset += band->mb_size;
}
offs += row_offset;
}
align_get_bits(&ctx->gb);
return 0;
}
/**
* Rearrange decoding and reference buffers.
*
* @param[in,out] ctx pointer to the decoder context
*/
static void switch_buffers(IVI45DecContext *ctx)
{
switch (ctx->prev_frame_type) {
case FRAMETYPE_INTRA:
case FRAMETYPE_INTRA1:
case FRAMETYPE_INTER:
ctx->buf_switch ^= 1;
ctx->dst_buf = ctx->buf_switch;
ctx->ref_buf = ctx->buf_switch ^ 1;
break;
case FRAMETYPE_INTER_NOREF:
break;
}
switch (ctx->frame_type) {
case FRAMETYPE_INTRA:
case FRAMETYPE_INTRA1:
ctx->buf_switch = 0;
/* FALLTHROUGH */
case FRAMETYPE_INTER:
ctx->dst_buf = ctx->buf_switch;
ctx->ref_buf = ctx->buf_switch ^ 1;
break;
case FRAMETYPE_INTER_NOREF:
case FRAMETYPE_NULL_FIRST:
case FRAMETYPE_NULL_LAST:
break;
}
}
static int is_nonnull_frame(IVI45DecContext *ctx)
{
return ctx->frame_type < FRAMETYPE_NULL_FIRST;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
IVI45DecContext *ctx = avctx->priv_data;
ff_ivi_init_static_vlc();
/* copy rvmap tables in our context so we can apply changes to them */
memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
/* Force allocation of the internal buffers */
/* during picture header decoding. */
ctx->pic_conf.pic_width = 0;
ctx->pic_conf.pic_height = 0;
avctx->pix_fmt = PIX_FMT_YUV410P;
ctx->decode_pic_hdr = decode_pic_hdr;
ctx->decode_band_hdr = decode_band_hdr;
ctx->decode_mb_info = decode_mb_info;
ctx->switch_buffers = switch_buffers;
ctx->is_nonnull_frame = is_nonnull_frame;
return 0;
}
AVCodec ff_indeo4_decoder = {
.name = "indeo4",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_INDEO4,
.priv_data_size = sizeof(IVI45DecContext),
.init = decode_init,
.close = ff_ivi_decode_close,
.decode = ff_ivi_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
};
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