winamp/Src/mpeg4dec/mpeg4vid_api.c

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2024-09-24 12:54:57 +00:00
#include "mpeg4vid_api.h"
#include "mp4def.h"
#include "mp4dec.h"
/* TODO: we havn't implemented "end of stream" yet, but when we do
we need to flush out the buffered frames
m_decInfo->VisualObject.vFrame = m_decInfo->VisualObject.VideoObject.prevPlaneIsB ?
&m_decInfo->VisualObject.nFrame : &m_decInfo->VisualObject.cFrame;
*/
// disable post processing for now, doesn't seem to be working out too well
//#define MP4V_DO_POST_PROCESS
#define MAX_CODED_FRAME 8000000 // TODO: benski> verify
typedef struct
{
mp4_Info dec;
int initted;
int resetting;
int skip_b_frames;
#ifdef MP4V_DO_POST_PROCESS
mp4_Frame ppFrame0, ppFrame1;
#endif
__declspec(align(32)) uint8_t buffer[MAX_CODED_FRAME];
} MPEG4VideoDecoder;
static int FreeBuffers(MPEG4VideoDecoder *decoder);
void mp4_Error(const char *str)
{
puts(str);
}
mpeg4vid_decoder_t MPEG4Video_CreateDecoder(int filetype, int codec)
{
MPEG4VideoDecoder *decoder = (MPEG4VideoDecoder *)malloc(sizeof(MPEG4VideoDecoder));
memset(decoder, 0, sizeof(MPEG4VideoDecoder));
// set configuration stuff
decoder->dec.stopOnErr = 0;
decoder->dec.strictSyntaxCheck = 0;
decoder->dec.VisualObject.verid = 1;
decoder->dec.ftype = filetype;
decoder->dec.ftype_f = codec;
return decoder;
}
void MPEG4Video_DestroyDecoder(mpeg4vid_decoder_t d)
{
MPEG4VideoDecoder *decoder = (MPEG4VideoDecoder *)d;
if (decoder)
{
#ifdef MP4V_DO_POST_PROCESS
free(decoder->ppFrame0.mid);
free(decoder->ppFrame1.mid);
#endif
FreeBuffers(decoder);
free(decoder);
}
}
void MPEG4Video_Flush(mpeg4vid_decoder_t d)
{
MPEG4VideoDecoder *decoder = (MPEG4VideoDecoder *)d;
if (decoder && decoder->initted)
{
mp4_ResetVOL(&decoder->dec);
decoder->resetting = 1;
}
}
static int AllocateInitFrame(mp4_Frame* pFrame)
{
int32_t w, h;
w = (pFrame->mbPerRow + 2 * MP4_NUM_EXT_MB) << 4;
h = (pFrame->mbPerCol + 2 * MP4_NUM_EXT_MB) << 4;
pFrame->mid = malloc(w * h + (w * h >> 1));
if (!pFrame->mid)
return 1; // out of memory
ippsSet_8u(0, pFrame->mid, w * h);
ippsSet_8u(128, pFrame->mid + w * h, w * h >> 1);
pFrame->stepY = w;
pFrame->stepCb = w >> 1;
pFrame->stepCr = w >> 1;
/* benski> stuff from LockFrame... */
pFrame->apY = pFrame->mid;
pFrame->pY = pFrame->apY + w * 16 + 16;
pFrame->apCb = pFrame->apY + w * h;
w >>= 1;
h >>= 1;
pFrame->pCb = pFrame->apCb + w * 8 + 8;
pFrame->apCr = pFrame->apCb + w * h;
pFrame->pCr = pFrame->apCr + w * 8 + 8;
return 0;
}
static int AllocateBuffers(MPEG4VideoDecoder *decoder)
{
if (mp4_InitVOL(&decoder->dec) != MP4_STATUS_OK)
{
mp4_Error("Error: No memory to allocate internal buffers\n");
return 1;//UMC_ERR_ALLOC;
}
return 0;
}
static int InsideInit(MPEG4VideoDecoder *decoder)
{
int status;
uint32_t code;
int h_vo_found = 0, h_vos_found = 0;
for (;;)
{
if (!mp4_SeekStartCodeOrShortPtr(&decoder->dec))
{
mp4_Error("Error: Can't find Visual Object or Video Object start codes or short_video_start_marker\n");
return 1;//UMC_ERR_SYNC;
}
// check short_video_start_marker
if (mp4_IsShortCode(&decoder->dec))
{
if ((mp4_Parse_VideoObject(&decoder->dec)) != MP4_STATUS_OK)
return 1;//UMC_ERR_INVALID_STREAM;
break;
}
code = mp4_GetBits(&decoder->dec, 8);
if (!h_vos_found && code == MP4_VISUAL_OBJECT_SEQUENCE_SC)
{
h_vos_found = 1;
if ((mp4_Parse_VisualObjectSequence(&decoder->dec)) != MP4_STATUS_OK)
return 1;//UMC_ERR_INVALID_STREAM;
}
if (!h_vo_found && code == MP4_VISUAL_OBJECT_SC)
{
h_vo_found = 1;
if ((mp4_Parse_VisualObject(&decoder->dec)) != MP4_STATUS_OK)
return 1;//UMC_ERR_INVALID_STREAM;
}
// some streams can start with video_object_layer
if ((int32_t)code >= MP4_VIDEO_OBJECT_LAYER_MIN_SC && code <= MP4_VIDEO_OBJECT_LAYER_MAX_SC) {
decoder->dec.bufptr -= 4;
if ((mp4_Parse_VideoObject(&decoder->dec)) != MP4_STATUS_OK)
return 1;//UMC_ERR_INVALID_STREAM;
break;
}
}
status = AllocateBuffers(decoder);
if (status)
return status;
#if 0 // don't really care about this, but might be useful code for later?
// set profile/level info
decoder->profile = decoder->dec.profile_and_level_indication >> 4;
decoder->level = decoder->dec.profile_and_level_indication & 15;
if (decoder->profile == MPEG4_PROFILE_SIMPLE)
if (decoder->level == 8)
decoder->level = MPEG4_LEVEL_0;
if (decoder->profile == MPEG4_PROFILE_ADVANCED_SIMPLE) {
if (decoder->level == 7)
decoder->level = MPEG4_LEVEL_3B;
if (decoder->level > 7) {
decoder->profile = MPEG4_PROFILE_FGS;
decoder->level -= 8;
}
}
#endif
decoder->initted = 1;
return 0;
}
static int FreeBuffers(MPEG4VideoDecoder *decoder)
{
int status = 0;
ReleaseFrame(&decoder->dec.VisualObject, decoder->dec.VisualObject.cFrame);
decoder->dec.VisualObject.cFrame=0;
ReleaseFrame(&decoder->dec.VisualObject, decoder->dec.VisualObject.rFrame);
decoder->dec.VisualObject.rFrame=0;
ReleaseFrame(&decoder->dec.VisualObject, decoder->dec.VisualObject.nFrame);
decoder->dec.VisualObject.nFrame=0;
ReleaseFrame(&decoder->dec.VisualObject, decoder->dec.VisualObject.sFrame);
decoder->dec.VisualObject.sFrame=0;
FreeCache(&decoder->dec.VisualObject);
mp4_FreeVOL(&decoder->dec);
return status;
}
static int PostProcess(MPEG4VideoDecoder *decoder, mp4_Frame *inout)
{
#ifdef MP4V_DO_POST_PROCESS
int w, h, i, j, k, QP, width, height;
IppiSize size;
Ipp8u *pSrc[3], *pDst[3];
int srcPitch[3], dstPitch[3], threshold[6];
int m_DeblockingProcPlane[3] = {1,1,1}; // TODO: configurable
int m_DeringingProcPlane[3] = {1,1,1}; // TODO: configurable
int32_t m_DeblockingTHR1 = 2; // TODO
int32_t m_DeblockingTHR2 = 6; // TODO
QP = inout->QP;
width = (decoder->dec.VisualObject.VideoObject.width + 7) & (~7);
height = (decoder->dec.VisualObject.VideoObject.height + 7) & (~7);
if (m_DeblockingProcPlane[0] || m_DeblockingProcPlane[1] || m_DeblockingProcPlane[2]) {
pSrc[0] = inout->pY;
srcPitch[0] = inout->stepY;
pDst[0] = decoder->ppFrame0.pY;
dstPitch[0] = decoder->ppFrame0.stepY;
pSrc[1] = inout->pCb;
srcPitch[1] = inout->stepCb;
pDst[1] = decoder->ppFrame0.pCb;
dstPitch[1] = decoder->ppFrame0.stepCb;
pSrc[2] = inout->pCr;
srcPitch[2] = inout->stepCr;
pDst[2] = decoder->ppFrame0.pCr;
dstPitch[2] = decoder->ppFrame0.stepCr;
for (k = 0; k < 3; k ++) {
if (m_DeblockingProcPlane[k]) {
size.height = 8;
if (k == 0) {
size.width = width;
h = height >> 3;
w = width >> 3;
} else {
size.width = width >> 1;
h = height >> 4;
w = width >> 4;
}
for (i = 0; i < h; i ++) {
ippiCopy_8u_C1R(pSrc[k], srcPitch[k], pDst[k], dstPitch[k], size);
if (i > 0) {
for (j = 0; j < w; j ++)
ippiFilterDeblocking8x8HorEdge_MPEG4_8u_C1IR(pDst[k] + 8 * j, dstPitch[k], QP, m_DeblockingTHR1, m_DeblockingTHR2);
for (j = 1; j < w; j ++)
ippiFilterDeblocking8x8VerEdge_MPEG4_8u_C1IR(pDst[k] - 8 * dstPitch[k] + 8 * j, dstPitch[k], QP, m_DeblockingTHR1, m_DeblockingTHR2);
}
if (i == h - 1) {
for (j = 1; j < w; j ++)
ippiFilterDeblocking8x8VerEdge_MPEG4_8u_C1IR(pDst[k] + 8 * j, dstPitch[k], QP, m_DeblockingTHR1, m_DeblockingTHR2);
}
pSrc[k] += srcPitch[k] * 8;
pDst[k] += dstPitch[k] * 8;
}
} else {
if (k == 0) {
size.width = width;
size.height = height;
} else {
size.width = width >> 1;
size.height = height >> 1;
}
ippiCopy_8u_C1R(pSrc[k], srcPitch[k], pDst[k], dstPitch[k], size);
}
}
*inout = decoder->ppFrame0;
}
if (m_DeringingProcPlane[0] || m_DeringingProcPlane[1] || m_DeringingProcPlane[2]) {
pSrc[0] = inout->pY;
srcPitch[0] = inout->stepY;
pDst[0] = decoder->ppFrame1.pY;
dstPitch[0] = decoder->ppFrame1.stepY;
if (!m_DeringingProcPlane[0]) {
size.width = width;
size.height = height;
ippiCopy_8u_C1R(pSrc[0], srcPitch[0], pDst[0], dstPitch[0], size);
}
pSrc[1] = inout->pCb;
srcPitch[1] = inout->stepCb;
pDst[1] = decoder->ppFrame1.pCb;
dstPitch[1] = decoder->ppFrame1.stepCb;
if (!m_DeringingProcPlane[1]) {
size.width = width >> 1;
size.height = height >> 1;
ippiCopy_8u_C1R(pSrc[1], srcPitch[1], pDst[1], dstPitch[1], size);
}
pSrc[2] = inout->pCr;
srcPitch[2] = inout->stepCr;
pDst[2] = decoder->ppFrame1.pCr;
dstPitch[2] = decoder->ppFrame1.stepCr;
if (!m_DeringingProcPlane[2]) {
size.width = width >> 1;
size.height = height >> 1;
ippiCopy_8u_C1R(pSrc[2], srcPitch[2], pDst[2], dstPitch[2], size);
}
h = inout->mbPerCol;
w = inout->mbPerRow;
for (i = 0; i < h; i ++) {
for (j = 0; j < w; j ++) {
ippiFilterDeringingThreshold_MPEG4_8u_P3R(pSrc[0]+ 16 * j, srcPitch[0], pSrc[1] + 8 * j, srcPitch[1], pSrc[2] + 8 * j, srcPitch[2], threshold);
// copy border macroblocks
if (i == 0 || i == h - 1 || j == 0 || j == w - 1) {
if (m_DeringingProcPlane[0])
ippiCopy16x16_8u_C1R(pSrc[0] + 16 * j, srcPitch[0], pDst[0] + 16 * j, dstPitch[0]);
if (m_DeringingProcPlane[1])
ippiCopy8x8_8u_C1R(pSrc[1] + 8 * j, srcPitch[1], pDst[1] + 8 * j, dstPitch[1]);
if (m_DeringingProcPlane[2])
ippiCopy8x8_8u_C1R(pSrc[2] + 8 * j, srcPitch[2], pDst[2] + 8 * j, dstPitch[2]);
}
if (m_DeringingProcPlane[0]) {
if (i != 0 && j != 0)
ippiFilterDeringingSmooth8x8_MPEG4_8u_C1R(pSrc[0] + 16 * j, srcPitch[0], pDst[0] + 16 * j, dstPitch[0], QP, threshold[0]);
if (i != 0 && j != w - 1)
ippiFilterDeringingSmooth8x8_MPEG4_8u_C1R(pSrc[0] + 16 * j + 8, srcPitch[0], pDst[0] + 16 * j + 8, dstPitch[0], QP, threshold[1]);
if (i != h - 1 && j != 0)
ippiFilterDeringingSmooth8x8_MPEG4_8u_C1R(pSrc[0] + 16 * j + 8 * srcPitch[0], srcPitch[0], pDst[0] + 16 * j + 8 * dstPitch[0], dstPitch[0], QP, threshold[2]);
if (i != h - 1 && j != w - 1)
ippiFilterDeringingSmooth8x8_MPEG4_8u_C1R(pSrc[0] + 16 * j + 8 * srcPitch[0] + 8, srcPitch[0], pDst[0] + 16 * j + 8 * dstPitch[0] + 8, dstPitch[0], QP, threshold[3]);
}
if (i != 0 && j != 0 && i != h - 1 && j != w - 1) {
if (m_DeringingProcPlane[1])
ippiFilterDeringingSmooth8x8_MPEG4_8u_C1R(pSrc[1] + 8 * j, srcPitch[1], pDst[1] + 8 * j, dstPitch[1], QP, threshold[4]);
if (m_DeringingProcPlane[2])
ippiFilterDeringingSmooth8x8_MPEG4_8u_C1R(pSrc[2] + 8 * j, srcPitch[2], pDst[2] + 8 * j, dstPitch[2], QP, threshold[5]);
}
}
pSrc[0] += srcPitch[0] * 16;
pDst[0] += dstPitch[0] * 16;
pSrc[1] += srcPitch[1] * 8;
pDst[1] += dstPitch[1] * 8;
pSrc[2] += srcPitch[2] * 8;
pDst[2] += dstPitch[2] * 8;
}
*inout = decoder->ppFrame1;
}
#endif
return 0;
}
void MPEG4Video_DecodeFrame(mpeg4vid_decoder_t d, const void *buffer, size_t bufferlen, uint64_t time_code)
{
int status=0;
int code;
MPEG4VideoDecoder *decoder = (MPEG4VideoDecoder *)d;
if (bufferlen > (MAX_CODED_FRAME-32))
return;
if (buffer)
{
memcpy(decoder->buffer, buffer, bufferlen);
memset(decoder->buffer+bufferlen, 0, 32);
decoder->dec.bitoff = 0;
decoder->dec.bufptr = decoder->dec.buffer = (uint8_t *)decoder->buffer;
decoder->dec.buflen = bufferlen;
}
if (!decoder->initted) // initialize off the first packet
{
status = InsideInit(decoder);
if (status)
return;
}
for (;;)
{
// Seeking the VOP start_code, and then begin the vop decoding
if (decoder->dec.VisualObject.VideoObject.short_video_header)
{
if (!mp4_SeekShortVideoStartMarker(&decoder->dec))
{
mp4_Error("Error: Failed seeking short_video_start_marker\n");
status = 1;//UMC_ERR_SYNC;
break;
}
}
else
{
for (;;)
{
if (!mp4_SeekStartCodePtr(&decoder->dec)) {
mp4_Error("Error: Failed seeking GOV or VOP Start Code");
status = 1;//UMC_ERR_SYNC;
break;
}
code = decoder->dec.bufptr[0];
decoder->dec.bufptr++;
// parse repeated VOS, VO and VOL headers because stream may be glued from different streams
if (code == MP4_VISUAL_OBJECT_SEQUENCE_SC)
{
if (mp4_Parse_VisualObjectSequence(&decoder->dec) != MP4_STATUS_OK)
{
status = 1;//UMC_ERR_INVALID_STREAM;
break;
}
}
else if (code == MP4_VISUAL_OBJECT_SC)
{
if (mp4_Parse_VisualObject(&decoder->dec) != MP4_STATUS_OK)
{
status = 1;//UMC_ERR_INVALID_STREAM;
break;
}
}
else if (code >= MP4_VIDEO_OBJECT_LAYER_MIN_SC && code <= MP4_VIDEO_OBJECT_LAYER_MAX_SC)
{
// save parameters which can affect on reinit
Ipp32s interlaced = decoder->dec.VisualObject.VideoObject.interlaced;
Ipp32s data_partitioned = decoder->dec.VisualObject.VideoObject.data_partitioned;
Ipp32s sprite_enable = decoder->dec.VisualObject.VideoObject.sprite_enable;
Ipp32s width = decoder->dec.VisualObject.VideoObject.width;
Ipp32s height = decoder->dec.VisualObject.VideoObject.height;
// in repeated headers check only VOL header
decoder->dec.bufptr -= 4;
if (mp4_Parse_VideoObject(&decoder->dec) != MP4_STATUS_OK) {
status = 1;//UMC_ERR_INVALID_STREAM;
break;
}
// realloc if something was changed
if (interlaced != decoder->dec.VisualObject.VideoObject.interlaced ||
data_partitioned != decoder->dec.VisualObject.VideoObject.data_partitioned ||
sprite_enable != decoder->dec.VisualObject.VideoObject.sprite_enable ||
width != decoder->dec.VisualObject.VideoObject.width ||
height != decoder->dec.VisualObject.VideoObject.height)
{
// TODO: return a code so we can return MP4_VIDEO_OUTPUT_FORMAT_CHANGED
if (decoder->dec.strictSyntaxCheck)
{
mp4_Error("Error: Repeated VOL header is different from previous");
status = 1;//UMC_ERR_INVALID_STREAM;
break;
}
// UnlockBuffers();
status = FreeBuffers(decoder);
if (status)
break;
status = AllocateBuffers(decoder);
if (status)
break;
// free buffers for MPEG-4 post-processing
#ifdef MP4V_DO_POST_PROCESS
free(decoder->ppFrame0.mid);
decoder->ppFrame0.mid = 0;
free(decoder->ppFrame1.mid);
decoder->ppFrame1.mid = 0;
#endif
// TODO: clear cache and display frames
}
// reinit quant matrix
ippiQuantInvIntraInit_MPEG4(decoder->dec.VisualObject.VideoObject.quant_type ? decoder->dec.VisualObject.VideoObject.intra_quant_mat : NULL, decoder->dec.VisualObject.VideoObject.QuantInvIntraSpec, 8);
ippiQuantInvInterInit_MPEG4(decoder->dec.VisualObject.VideoObject.quant_type ? decoder->dec.VisualObject.VideoObject.nonintra_quant_mat : NULL, decoder->dec.VisualObject.VideoObject.QuantInvInterSpec, 8);
}
else if (code == MP4_GROUP_OF_VOP_SC)
{
if (mp4_Parse_GroupOfVideoObjectPlane(&decoder->dec) != MP4_STATUS_OK)
{
status = 1;//UMC_ERR_INVALID_STREAM;
break;
}
}
else if (decoder->dec.bufptr[-1] == MP4_VIDEO_OBJECT_PLANE_SC)
{
break;
}
}
if (status)
break;
}
// parse VOP header
if ((mp4_Parse_VideoObjectPlane(&decoder->dec)) != MP4_STATUS_OK)
{
//status = UMC_WRN_INVALID_STREAM;
status = 0;
break;
}
if (decoder->resetting && decoder->dec.VisualObject.VideoObject.VideoObjectPlane.coding_type != MP4_VOP_TYPE_I)
{
//UnlockBuffers();
//return UMC_ERR_NOT_ENOUGH_DATA;
// decoder->dec.VisualObject.vFrame = NULL;
status = 1;//UMC_ERR_NOT_ENOUGH_DATA;
break;
}
if (decoder->dec.VisualObject.VideoObject.VideoObjectPlane.coding_type == MP4_VOP_TYPE_B)
{
if (decoder->skip_b_frames)
{
decoder->dec.bufptr = decoder->dec.buffer+ decoder->dec.buflen;
status = 1;//UMC_ERR_NOT_ENOUGH_DATA;
break;
}
}
// decode VOP
if ((mp4_DecodeVideoObjectPlane(&decoder->dec)) != MP4_STATUS_OK)
{
status = 1;//UMC_WRN_INVALID_STREAM;
}
if (decoder->dec.VisualObject.cFrame)
{
decoder->dec.VisualObject.cFrame->timestamp = time_code;
decoder->dec.VisualObject.cFrame->QP = decoder->dec.VisualObject.VideoObject.short_video_header ? decoder->dec.VisualObject.VideoObject.VideoObjectPlaneH263.vop_quant : decoder->dec.VisualObject.VideoObject.VideoObjectPlane.quant;
}
// after reset it is need to skip first B-frames
if (decoder->dec.VisualObject.VideoObject.VOPindex < 2 && decoder->dec.VisualObject.VideoObject.VideoObjectPlane.coding_type == MP4_VOP_TYPE_B)
{
status = 1;//UMC_ERR_NOT_ENOUGH_DATA;
break;
}
// do not count not_coded P frames with same vop_time as reference (in AVI)
if (decoder->dec.VisualObject.VideoObject.VideoObjectPlane.coded ||
(
decoder->dec.VisualObject.cFrame &&
(!decoder->dec.VisualObject.rFrame || (decoder->dec.VisualObject.rFrame->time != decoder->dec.VisualObject.cFrame->time)) &&
(!decoder->dec.VisualObject.nFrame || (decoder->dec.VisualObject.nFrame->time != decoder->dec.VisualObject.cFrame->time))
)
)
{
decoder->dec.VisualObject.VideoObject.VOPindex++;
}
else
{
status = 1;//UMC_ERR_NOT_ENOUGH_DATA;
break;
}
if (decoder->resetting && decoder->dec.VisualObject.VideoObject.VideoObjectPlane.coding_type == MP4_VOP_TYPE_I)
{
// TODO: ???m_time_reset = (Ipp32s)decoder->dec.VisualObject.cFrame.time;
//decoder->dec.VisualObject.vFrame = NULL;
decoder->resetting = 0;
}
}
// return status;
}
void MPEG4Video_GetPicture(mpeg4vid_decoder_t d, mp4_Frame **frame)
{
int status = 0;
MPEG4VideoDecoder *decoder = (MPEG4VideoDecoder *)d;
mp4_Frame *rendFrame = GetDisplayFrame(&decoder->dec.VisualObject);
if (rendFrame)
{
uint64_t timestamp = rendFrame->timestamp;
#ifdef MP4V_DO_POST_PROCESS
if (1 /* TODO: disable deblocking and deringing on request*/)
{
if (!decoder->ppFrame0.mid)
{
decoder->ppFrame0.mbPerRow = decoder->dec.VisualObject.vFrame->mbPerRow;
decoder->ppFrame0.mbPerCol = decoder->dec.VisualObject.vFrame->mbPerCol;
status = AllocateInitFrame(&decoder->ppFrame0);
if (status)
return ;
}
if (!decoder->ppFrame1.mid)
{
decoder->ppFrame1.mbPerRow = decoder->dec.VisualObject.vFrame->mbPerRow;
decoder->ppFrame1.mbPerCol = decoder->dec.VisualObject.vFrame->mbPerCol;
status = AllocateInitFrame(&decoder->ppFrame1);
if (status)
return ;
}
PostProcess(decoder, rendFrame);
}
#endif
//if (m_LastDecodedFrame.GetColorFormat() != YUV420) {
// m_LastDecodedFrame.Init(decoder->dec.VisualObject.VideoObject.width, decoder->dec.VisualObject.VideoObject.height, YUV420);
//}
// TODO ??? m_LastDecodedFrame.SetTime(pts);
*frame = rendFrame;
rendFrame->timestamp = timestamp;
}
else
*frame = 0;
}
void MPEG4Video_ReleaseFrame(mpeg4vid_decoder_t d, mp4_Frame *frame)
{
MPEG4VideoDecoder *decoder = (MPEG4VideoDecoder *)d;
ReleaseFrame(&decoder->dec.VisualObject, frame);
}
static double GetAspectRatio(mp4_VideoObject *video_object)
{
int aspect_ratio_width=1, aspect_ratio_height=1;
switch (video_object->aspect_ratio_info)
{
case MP4_ASPECT_RATIO_FORBIDDEN:
case MP4_ASPECT_RATIO_1_1:
aspect_ratio_width = 1;
aspect_ratio_height = 1;
break;
case MP4_ASPECT_RATIO_12_11:
aspect_ratio_width = 12;
aspect_ratio_height = 11;
break;
case MP4_ASPECT_RATIO_10_11:
aspect_ratio_width = 10;
aspect_ratio_height = 11;
break;
case MP4_ASPECT_RATIO_16_11:
aspect_ratio_width = 16;
aspect_ratio_height = 11;
break;
case MP4_ASPECT_RATIO_40_33:
aspect_ratio_width = 40;
aspect_ratio_height = 33;
break;
default:
aspect_ratio_width = video_object->aspect_ratio_info_par_width;
aspect_ratio_height = video_object->aspect_ratio_info_par_height;
break;
}
return (double)aspect_ratio_width / (double)aspect_ratio_height;
}
int MPEG4Video_GetOutputFormat(mpeg4vid_decoder_t d, int *width, int *height, double *aspect_ratio)
{
MPEG4VideoDecoder *decoder = (MPEG4VideoDecoder *)d;
if (decoder && decoder->initted)
{
*width = decoder->dec.VisualObject.VideoObject.width;
*height = decoder->dec.VisualObject.VideoObject.height;
*aspect_ratio = GetAspectRatio(&decoder->dec.VisualObject.VideoObject);
return 0;
}
return 1;
}
void MPEG4Video_HurryUp(mpeg4vid_decoder_t d, int state)
{
MPEG4VideoDecoder *decoder = (MPEG4VideoDecoder *)d;
if (decoder)
{
decoder->skip_b_frames = state;
}
}
void MPEG4Video_EndOfStream(mpeg4vid_decoder_t d)
{
MPEG4VideoDecoder *decoder = (MPEG4VideoDecoder *)d;
if (decoder)
{
// TODO
}
}