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FFmpeg4/libavcodec/nvdec.c

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/*
* HW decode acceleration through NVDEC
*
* Copyright (c) 2016 Anton Khirnov
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "libavutil/common.h"
#include "libavutil/error.h"
#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_cuda_internal.h"
#include "libavutil/cuda_check.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "avcodec.h"
#include "decode.h"
#include "nvdec.h"
#include "internal.h"
#if !NVDECAPI_CHECK_VERSION(9, 0)
#define cudaVideoSurfaceFormat_YUV444 2
#define cudaVideoSurfaceFormat_YUV444_16Bit 3
#endif
typedef struct NVDECDecoder {
CUvideodecoder decoder;
AVBufferRef *hw_device_ref;
AVBufferRef *real_hw_frames_ref;
CUcontext cuda_ctx;
CUstream stream;
CudaFunctions *cudl;
CuvidFunctions *cvdl;
} NVDECDecoder;
typedef struct NVDECFramePool {
unsigned int dpb_size;
unsigned int nb_allocated;
} NVDECFramePool;
#define CHECK_CU(x) FF_CUDA_CHECK_DL(logctx, decoder->cudl, x)
static int map_avcodec_id(enum AVCodecID id)
{
switch (id) {
case AV_CODEC_ID_H264: return cudaVideoCodec_H264;
case AV_CODEC_ID_HEVC: return cudaVideoCodec_HEVC;
case AV_CODEC_ID_MJPEG: return cudaVideoCodec_JPEG;
case AV_CODEC_ID_MPEG1VIDEO: return cudaVideoCodec_MPEG1;
case AV_CODEC_ID_MPEG2VIDEO: return cudaVideoCodec_MPEG2;
case AV_CODEC_ID_MPEG4: return cudaVideoCodec_MPEG4;
case AV_CODEC_ID_VC1: return cudaVideoCodec_VC1;
case AV_CODEC_ID_VP8: return cudaVideoCodec_VP8;
case AV_CODEC_ID_VP9: return cudaVideoCodec_VP9;
case AV_CODEC_ID_WMV3: return cudaVideoCodec_VC1;
}
return -1;
}
static int map_chroma_format(enum AVPixelFormat pix_fmt)
{
int shift_h = 0, shift_v = 0;
av_pix_fmt_get_chroma_sub_sample(pix_fmt, &shift_h, &shift_v);
if (shift_h == 1 && shift_v == 1)
return cudaVideoChromaFormat_420;
else if (shift_h == 1 && shift_v == 0)
return cudaVideoChromaFormat_422;
else if (shift_h == 0 && shift_v == 0)
return cudaVideoChromaFormat_444;
return -1;
}
static int nvdec_test_capabilities(NVDECDecoder *decoder,
CUVIDDECODECREATEINFO *params, void *logctx)
{
int ret;
CUVIDDECODECAPS caps = { 0 };
caps.eCodecType = params->CodecType;
caps.eChromaFormat = params->ChromaFormat;
caps.nBitDepthMinus8 = params->bitDepthMinus8;
if (!decoder->cvdl->cuvidGetDecoderCaps) {
av_log(logctx, AV_LOG_WARNING, "Used Nvidia driver is too old to perform a capability check.\n");
av_log(logctx, AV_LOG_WARNING, "The minimum required version is "
#if defined(_WIN32) || defined(__CYGWIN__)
"378.66"
#else
"378.13"
#endif
". Continuing blind.\n");
return 0;
}
ret = CHECK_CU(decoder->cvdl->cuvidGetDecoderCaps(&caps));
if (ret < 0)
return ret;
av_log(logctx, AV_LOG_VERBOSE, "NVDEC capabilities:\n");
av_log(logctx, AV_LOG_VERBOSE, "format supported: %s, max_mb_count: %d\n",
caps.bIsSupported ? "yes" : "no", caps.nMaxMBCount);
av_log(logctx, AV_LOG_VERBOSE, "min_width: %d, max_width: %d\n",
caps.nMinWidth, caps.nMaxWidth);
av_log(logctx, AV_LOG_VERBOSE, "min_height: %d, max_height: %d\n",
caps.nMinHeight, caps.nMaxHeight);
if (!caps.bIsSupported) {
av_log(logctx, AV_LOG_ERROR, "Hardware is lacking required capabilities\n");
return AVERROR(EINVAL);
}
if (params->ulWidth > caps.nMaxWidth || params->ulWidth < caps.nMinWidth) {
av_log(logctx, AV_LOG_ERROR, "Video width %d not within range from %d to %d\n",
(int)params->ulWidth, caps.nMinWidth, caps.nMaxWidth);
return AVERROR(EINVAL);
}
if (params->ulHeight > caps.nMaxHeight || params->ulHeight < caps.nMinHeight) {
av_log(logctx, AV_LOG_ERROR, "Video height %d not within range from %d to %d\n",
(int)params->ulHeight, caps.nMinHeight, caps.nMaxHeight);
return AVERROR(EINVAL);
}
if ((params->ulWidth * params->ulHeight) / 256 > caps.nMaxMBCount) {
av_log(logctx, AV_LOG_ERROR, "Video macroblock count %d exceeds maximum of %d\n",
(int)(params->ulWidth * params->ulHeight) / 256, caps.nMaxMBCount);
return AVERROR(EINVAL);
}
return 0;
}
static void nvdec_decoder_free(void *opaque, uint8_t *data)
{
NVDECDecoder *decoder = (NVDECDecoder*)data;
if (decoder->decoder) {
void *logctx = decoder->hw_device_ref->data;
CUcontext dummy;
CHECK_CU(decoder->cudl->cuCtxPushCurrent(decoder->cuda_ctx));
CHECK_CU(decoder->cvdl->cuvidDestroyDecoder(decoder->decoder));
CHECK_CU(decoder->cudl->cuCtxPopCurrent(&dummy));
}
av_buffer_unref(&decoder->real_hw_frames_ref);
av_buffer_unref(&decoder->hw_device_ref);
cuvid_free_functions(&decoder->cvdl);
av_freep(&decoder);
}
static int nvdec_decoder_create(AVBufferRef **out, AVBufferRef *hw_device_ref,
CUVIDDECODECREATEINFO *params, void *logctx)
{
AVHWDeviceContext *hw_device_ctx = (AVHWDeviceContext*)hw_device_ref->data;
AVCUDADeviceContext *device_hwctx = hw_device_ctx->hwctx;
AVBufferRef *decoder_ref;
NVDECDecoder *decoder;
CUcontext dummy;
int ret;
decoder = av_mallocz(sizeof(*decoder));
if (!decoder)
return AVERROR(ENOMEM);
decoder_ref = av_buffer_create((uint8_t*)decoder, sizeof(*decoder),
nvdec_decoder_free, NULL, AV_BUFFER_FLAG_READONLY);
if (!decoder_ref) {
av_freep(&decoder);
return AVERROR(ENOMEM);
}
decoder->hw_device_ref = av_buffer_ref(hw_device_ref);
if (!decoder->hw_device_ref) {
ret = AVERROR(ENOMEM);
goto fail;
}
decoder->cuda_ctx = device_hwctx->cuda_ctx;
decoder->cudl = device_hwctx->internal->cuda_dl;
decoder->stream = device_hwctx->stream;
ret = cuvid_load_functions(&decoder->cvdl, logctx);
if (ret < 0) {
av_log(logctx, AV_LOG_ERROR, "Failed loading nvcuvid.\n");
goto fail;
}
ret = CHECK_CU(decoder->cudl->cuCtxPushCurrent(decoder->cuda_ctx));
if (ret < 0)
goto fail;
ret = nvdec_test_capabilities(decoder, params, logctx);
if (ret < 0) {
CHECK_CU(decoder->cudl->cuCtxPopCurrent(&dummy));
goto fail;
}
ret = CHECK_CU(decoder->cvdl->cuvidCreateDecoder(&decoder->decoder, params));
CHECK_CU(decoder->cudl->cuCtxPopCurrent(&dummy));
if (ret < 0) {
goto fail;
}
*out = decoder_ref;
return 0;
fail:
av_buffer_unref(&decoder_ref);
return ret;
}
static AVBufferRef *nvdec_decoder_frame_alloc(void *opaque, int size)
{
NVDECFramePool *pool = opaque;
AVBufferRef *ret;
if (pool->nb_allocated >= pool->dpb_size)
return NULL;
ret = av_buffer_alloc(sizeof(unsigned int));
if (!ret)
return NULL;
*(unsigned int*)ret->data = pool->nb_allocated++;
return ret;
}
int ff_nvdec_decode_uninit(AVCodecContext *avctx)
{
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
av_freep(&ctx->bitstream);
ctx->bitstream_len = 0;
ctx->bitstream_allocated = 0;
av_freep(&ctx->slice_offsets);
ctx->nb_slices = 0;
ctx->slice_offsets_allocated = 0;
av_buffer_unref(&ctx->decoder_ref);
av_buffer_pool_uninit(&ctx->decoder_pool);
return 0;
}
static void nvdec_free_dummy(struct AVHWFramesContext *ctx)
{
av_buffer_pool_uninit(&ctx->pool);
}
static AVBufferRef *nvdec_alloc_dummy(int size)
{
return av_buffer_create(NULL, 0, NULL, NULL, 0);
}
static int nvdec_init_hwframes(AVCodecContext *avctx, AVBufferRef **out_frames_ref, int dummy)
{
AVHWFramesContext *frames_ctx;
int ret;
ret = avcodec_get_hw_frames_parameters(avctx,
avctx->hw_device_ctx,
avctx->hwaccel->pix_fmt,
out_frames_ref);
if (ret < 0)
return ret;
frames_ctx = (AVHWFramesContext*)(*out_frames_ref)->data;
if (dummy) {
// Copied from ff_decode_get_hw_frames_ctx for compatibility
frames_ctx->initial_pool_size += 3;
frames_ctx->free = nvdec_free_dummy;
frames_ctx->pool = av_buffer_pool_init(0, nvdec_alloc_dummy);
if (!frames_ctx->pool) {
av_buffer_unref(out_frames_ref);
return AVERROR(ENOMEM);
}
} else {
// This is normally not used to actually allocate frames from
frames_ctx->initial_pool_size = 0;
}
ret = av_hwframe_ctx_init(*out_frames_ref);
if (ret < 0) {
av_buffer_unref(out_frames_ref);
return ret;
}
return 0;
}
int ff_nvdec_decode_init(AVCodecContext *avctx)
{
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
NVDECDecoder *decoder;
AVBufferRef *real_hw_frames_ref;
NVDECFramePool *pool;
AVHWFramesContext *frames_ctx;
const AVPixFmtDescriptor *sw_desc;
CUVIDDECODECREATEINFO params = { 0 };
cudaVideoSurfaceFormat output_format;
int cuvid_codec_type, cuvid_chroma_format, chroma_444;
int ret = 0;
sw_desc = av_pix_fmt_desc_get(avctx->sw_pix_fmt);
if (!sw_desc)
return AVERROR_BUG;
cuvid_codec_type = map_avcodec_id(avctx->codec_id);
if (cuvid_codec_type < 0) {
av_log(avctx, AV_LOG_ERROR, "Unsupported codec ID\n");
return AVERROR_BUG;
}
cuvid_chroma_format = map_chroma_format(avctx->sw_pix_fmt);
if (cuvid_chroma_format < 0) {
av_log(avctx, AV_LOG_ERROR, "Unsupported chroma format\n");
return AVERROR(ENOSYS);
}
chroma_444 = ctx->supports_444 && cuvid_chroma_format == cudaVideoChromaFormat_444;
if (!avctx->hw_frames_ctx) {
ret = nvdec_init_hwframes(avctx, &avctx->hw_frames_ctx, 1);
if (ret < 0)
return ret;
ret = nvdec_init_hwframes(avctx, &real_hw_frames_ref, 0);
if (ret < 0)
return ret;
} else {
real_hw_frames_ref = av_buffer_ref(avctx->hw_frames_ctx);
if (!real_hw_frames_ref)
return AVERROR(ENOMEM);
}
switch (sw_desc->comp[0].depth) {
case 8:
output_format = chroma_444 ? cudaVideoSurfaceFormat_YUV444 :
cudaVideoSurfaceFormat_NV12;
break;
case 10:
case 12:
output_format = chroma_444 ? cudaVideoSurfaceFormat_YUV444_16Bit :
cudaVideoSurfaceFormat_P016;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth\n");
av_buffer_unref(&real_hw_frames_ref);
return AVERROR(ENOSYS);
}
frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
params.ulWidth = avctx->coded_width;
params.ulHeight = avctx->coded_height;
params.ulTargetWidth = avctx->coded_width;
params.ulTargetHeight = avctx->coded_height;
params.bitDepthMinus8 = sw_desc->comp[0].depth - 8;
params.OutputFormat = output_format;
params.CodecType = cuvid_codec_type;
params.ChromaFormat = cuvid_chroma_format;
params.ulNumDecodeSurfaces = frames_ctx->initial_pool_size;
params.ulNumOutputSurfaces = frames_ctx->initial_pool_size;
ret = nvdec_decoder_create(&ctx->decoder_ref, frames_ctx->device_ref, &params, avctx);
if (ret < 0) {
if (params.ulNumDecodeSurfaces > 32) {
av_log(avctx, AV_LOG_WARNING, "Using more than 32 (%d) decode surfaces might cause nvdec to fail.\n",
(int)params.ulNumDecodeSurfaces);
av_log(avctx, AV_LOG_WARNING, "Try lowering the amount of threads. Using %d right now.\n",
avctx->thread_count);
}
av_buffer_unref(&real_hw_frames_ref);
return ret;
}
decoder = (NVDECDecoder*)ctx->decoder_ref->data;
decoder->real_hw_frames_ref = real_hw_frames_ref;
real_hw_frames_ref = NULL;
pool = av_mallocz(sizeof(*pool));
if (!pool) {
ret = AVERROR(ENOMEM);
goto fail;
}
pool->dpb_size = frames_ctx->initial_pool_size;
ctx->decoder_pool = av_buffer_pool_init2(sizeof(int), pool,
nvdec_decoder_frame_alloc, av_free);
if (!ctx->decoder_pool) {
ret = AVERROR(ENOMEM);
goto fail;
}
return 0;
fail:
ff_nvdec_decode_uninit(avctx);
return ret;
}
static void nvdec_fdd_priv_free(void *priv)
{
NVDECFrame *cf = priv;
if (!cf)
return;
av_buffer_unref(&cf->idx_ref);
av_buffer_unref(&cf->decoder_ref);
av_freep(&priv);
}
static void nvdec_unmap_mapped_frame(void *opaque, uint8_t *data)
{
NVDECFrame *unmap_data = (NVDECFrame*)data;
NVDECDecoder *decoder = (NVDECDecoder*)unmap_data->decoder_ref->data;
void *logctx = decoder->hw_device_ref->data;
CUdeviceptr devptr = (CUdeviceptr)opaque;
int ret;
CUcontext dummy;
ret = CHECK_CU(decoder->cudl->cuCtxPushCurrent(decoder->cuda_ctx));
if (ret < 0)
goto finish;
CHECK_CU(decoder->cvdl->cuvidUnmapVideoFrame(decoder->decoder, devptr));
CHECK_CU(decoder->cudl->cuCtxPopCurrent(&dummy));
finish:
av_buffer_unref(&unmap_data->idx_ref);
av_buffer_unref(&unmap_data->decoder_ref);
av_free(unmap_data);
}
static int nvdec_retrieve_data(void *logctx, AVFrame *frame)
{
FrameDecodeData *fdd = (FrameDecodeData*)frame->private_ref->data;
NVDECFrame *cf = (NVDECFrame*)fdd->hwaccel_priv;
NVDECDecoder *decoder = (NVDECDecoder*)cf->decoder_ref->data;
AVHWFramesContext *hwctx = (AVHWFramesContext *)frame->hw_frames_ctx->data;
CUVIDPROCPARAMS vpp = { 0 };
NVDECFrame *unmap_data = NULL;
CUcontext dummy;
CUdeviceptr devptr;
unsigned int pitch, i;
unsigned int offset = 0;
int shift_h = 0, shift_v = 0;
int ret = 0;
vpp.progressive_frame = 1;
vpp.output_stream = decoder->stream;
ret = CHECK_CU(decoder->cudl->cuCtxPushCurrent(decoder->cuda_ctx));
if (ret < 0)
return ret;
ret = CHECK_CU(decoder->cvdl->cuvidMapVideoFrame(decoder->decoder,
cf->idx, &devptr,
&pitch, &vpp));
if (ret < 0)
goto finish;
unmap_data = av_mallocz(sizeof(*unmap_data));
if (!unmap_data) {
ret = AVERROR(ENOMEM);
goto copy_fail;
}
frame->buf[1] = av_buffer_create((uint8_t *)unmap_data, sizeof(*unmap_data),
nvdec_unmap_mapped_frame, (void*)devptr,
AV_BUFFER_FLAG_READONLY);
if (!frame->buf[1]) {
ret = AVERROR(ENOMEM);
goto copy_fail;
}
av_buffer_unref(&frame->hw_frames_ctx);
frame->hw_frames_ctx = av_buffer_ref(decoder->real_hw_frames_ref);
if (!frame->hw_frames_ctx) {
ret = AVERROR(ENOMEM);
goto copy_fail;
}
unmap_data->idx = cf->idx;
unmap_data->idx_ref = av_buffer_ref(cf->idx_ref);
unmap_data->decoder_ref = av_buffer_ref(cf->decoder_ref);
av_pix_fmt_get_chroma_sub_sample(hwctx->sw_format, &shift_h, &shift_v);
for (i = 0; frame->linesize[i]; i++) {
frame->data[i] = (uint8_t*)(devptr + offset);
frame->linesize[i] = pitch;
offset += pitch * (frame->height >> (i ? shift_v : 0));
}
goto finish;
copy_fail:
if (!frame->buf[1]) {
CHECK_CU(decoder->cvdl->cuvidUnmapVideoFrame(decoder->decoder, devptr));
av_freep(&unmap_data);
} else {
av_buffer_unref(&frame->buf[1]);
}
finish:
CHECK_CU(decoder->cudl->cuCtxPopCurrent(&dummy));
return ret;
}
int ff_nvdec_start_frame(AVCodecContext *avctx, AVFrame *frame)
{
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
FrameDecodeData *fdd = (FrameDecodeData*)frame->private_ref->data;
NVDECFrame *cf = NULL;
int ret;
ctx->bitstream_len = 0;
ctx->nb_slices = 0;
if (fdd->hwaccel_priv)
return 0;
cf = av_mallocz(sizeof(*cf));
if (!cf)
return AVERROR(ENOMEM);
cf->decoder_ref = av_buffer_ref(ctx->decoder_ref);
if (!cf->decoder_ref) {
ret = AVERROR(ENOMEM);
goto fail;
}
cf->idx_ref = av_buffer_pool_get(ctx->decoder_pool);
if (!cf->idx_ref) {
av_log(avctx, AV_LOG_ERROR, "No decoder surfaces left\n");
ret = AVERROR(ENOMEM);
goto fail;
}
cf->idx = *(unsigned int*)cf->idx_ref->data;
fdd->hwaccel_priv = cf;
fdd->hwaccel_priv_free = nvdec_fdd_priv_free;
fdd->post_process = nvdec_retrieve_data;
return 0;
fail:
nvdec_fdd_priv_free(cf);
return ret;
}
int ff_nvdec_end_frame(AVCodecContext *avctx)
{
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
NVDECDecoder *decoder = (NVDECDecoder*)ctx->decoder_ref->data;
void *logctx = avctx;
CUVIDPICPARAMS *pp = &ctx->pic_params;
CUcontext dummy;
int ret = 0;
pp->nBitstreamDataLen = ctx->bitstream_len;
pp->pBitstreamData = ctx->bitstream;
pp->nNumSlices = ctx->nb_slices;
pp->pSliceDataOffsets = ctx->slice_offsets;
ret = CHECK_CU(decoder->cudl->cuCtxPushCurrent(decoder->cuda_ctx));
if (ret < 0)
return ret;
ret = CHECK_CU(decoder->cvdl->cuvidDecodePicture(decoder->decoder, &ctx->pic_params));
if (ret < 0)
goto finish;
finish:
CHECK_CU(decoder->cudl->cuCtxPopCurrent(&dummy));
return ret;
}
int ff_nvdec_simple_end_frame(AVCodecContext *avctx)
{
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
int ret = ff_nvdec_end_frame(avctx);
ctx->bitstream = NULL;
return ret;
}
int ff_nvdec_simple_decode_slice(AVCodecContext *avctx, const uint8_t *buffer,
uint32_t size)
{
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
void *tmp;
tmp = av_fast_realloc(ctx->slice_offsets, &ctx->slice_offsets_allocated,
(ctx->nb_slices + 1) * sizeof(*ctx->slice_offsets));
if (!tmp)
return AVERROR(ENOMEM);
ctx->slice_offsets = tmp;
if (!ctx->bitstream)
ctx->bitstream = (uint8_t*)buffer;
ctx->slice_offsets[ctx->nb_slices] = buffer - ctx->bitstream;
ctx->bitstream_len += size;
ctx->nb_slices++;
return 0;
}
int ff_nvdec_frame_params(AVCodecContext *avctx,
AVBufferRef *hw_frames_ctx,
int dpb_size,
int supports_444)
{
AVHWFramesContext *frames_ctx = (AVHWFramesContext*)hw_frames_ctx->data;
const AVPixFmtDescriptor *sw_desc;
int cuvid_codec_type, cuvid_chroma_format, chroma_444;
sw_desc = av_pix_fmt_desc_get(avctx->sw_pix_fmt);
if (!sw_desc)
return AVERROR_BUG;
cuvid_codec_type = map_avcodec_id(avctx->codec_id);
if (cuvid_codec_type < 0) {
av_log(avctx, AV_LOG_ERROR, "Unsupported codec ID\n");
return AVERROR_BUG;
}
cuvid_chroma_format = map_chroma_format(avctx->sw_pix_fmt);
if (cuvid_chroma_format < 0) {
av_log(avctx, AV_LOG_VERBOSE, "Unsupported chroma format\n");
return AVERROR(EINVAL);
}
chroma_444 = supports_444 && cuvid_chroma_format == cudaVideoChromaFormat_444;
frames_ctx->format = AV_PIX_FMT_CUDA;
frames_ctx->width = (avctx->coded_width + 1) & ~1;
frames_ctx->height = (avctx->coded_height + 1) & ~1;
/*
* We add two extra frames to the pool to account for deinterlacing filters
* holding onto their frames.
*/
frames_ctx->initial_pool_size = dpb_size + 2;
switch (sw_desc->comp[0].depth) {
case 8:
frames_ctx->sw_format = chroma_444 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_NV12;
break;
case 10:
frames_ctx->sw_format = chroma_444 ? AV_PIX_FMT_YUV444P16 : AV_PIX_FMT_P010;
break;
case 12:
frames_ctx->sw_format = chroma_444 ? AV_PIX_FMT_YUV444P16 : AV_PIX_FMT_P016;
break;
default:
return AVERROR(EINVAL);
}
return 0;
}
int ff_nvdec_get_ref_idx(AVFrame *frame)
{
FrameDecodeData *fdd;
NVDECFrame *cf;
if (!frame || !frame->private_ref)
return -1;
fdd = (FrameDecodeData*)frame->private_ref->data;
cf = (NVDECFrame*)fdd->hwaccel_priv;
if (!cf)
return -1;
return cf->idx;
}
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