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FFmpeg/libavcodec/videotoolboxenc.c

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/*
* copyright (c) 2015 Rick Kern <kernrj@gmail.com>
*
* 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 <VideoToolbox/VideoToolbox.h>
#include <CoreVideo/CoreVideo.h>
#include <CoreMedia/CoreMedia.h>
#include <TargetConditionals.h>
#include <Availability.h>
#include "avcodec.h"
#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "libavutil/atomic.h"
#include "libavutil/avstring.h"
#include "libavcodec/avcodec.h"
#include "internal.h"
#include <pthread.h>
typedef enum VT_H264Profile {
H264_PROF_AUTO,
H264_PROF_BASELINE,
H264_PROF_MAIN,
H264_PROF_HIGH,
H264_PROF_COUNT
} VT_H264Profile;
static const uint8_t start_code[] = { 0, 0, 0, 1 };
typedef struct BufNode {
CMSampleBufferRef cm_buffer;
struct BufNode* next;
int error;
} BufNode;
typedef struct VTEncContext {
AVClass *class;
VTCompressionSessionRef session;
pthread_mutex_t lock;
pthread_cond_t cv_sample_sent;
int async_error;
BufNode *q_head;
BufNode *q_tail;
int64_t frame_ct_out;
int64_t frame_ct_in;
int64_t first_pts;
int64_t dts_delta;
int64_t profile;
int64_t level;
bool flushing;
bool has_b_frames;
bool warned_color_range;
} VTEncContext;
static void set_async_error(VTEncContext *vtctx, int err)
{
BufNode *info;
pthread_mutex_lock(&vtctx->lock);
vtctx->async_error = err;
info = vtctx->q_head;
vtctx->q_head = vtctx->q_tail = NULL;
while (info) {
BufNode *next = info->next;
CFRelease(info->cm_buffer);
av_free(info);
info = next;
}
pthread_mutex_unlock(&vtctx->lock);
}
static int vtenc_q_pop(VTEncContext *vtctx, bool wait, CMSampleBufferRef *buf)
{
BufNode *info;
pthread_mutex_lock(&vtctx->lock);
if (vtctx->async_error) {
pthread_mutex_unlock(&vtctx->lock);
return vtctx->async_error;
}
if (vtctx->flushing && vtctx->frame_ct_in == vtctx->frame_ct_out) {
*buf = NULL;
pthread_mutex_unlock(&vtctx->lock);
return 0;
}
while (!vtctx->q_head && !vtctx->async_error && wait) {
pthread_cond_wait(&vtctx->cv_sample_sent, &vtctx->lock);
}
if (!vtctx->q_head) {
pthread_mutex_unlock(&vtctx->lock);
*buf = NULL;
return 0;
}
info = vtctx->q_head;
vtctx->q_head = vtctx->q_head->next;
if (!vtctx->q_head) {
vtctx->q_tail = NULL;
}
pthread_mutex_unlock(&vtctx->lock);
*buf = info->cm_buffer;
av_free(info);
vtctx->frame_ct_out++;
return 0;
}
static void vtenc_q_push(VTEncContext *vtctx, CMSampleBufferRef buffer)
{
BufNode *info = av_malloc(sizeof(BufNode));
if (!info) {
set_async_error(vtctx, AVERROR(ENOMEM));
return;
}
CFRetain(buffer);
info->cm_buffer = buffer;
info->next = NULL;
pthread_mutex_lock(&vtctx->lock);
pthread_cond_signal(&vtctx->cv_sample_sent);
if (!vtctx->q_head) {
vtctx->q_head = info;
} else {
vtctx->q_tail->next = info;
}
vtctx->q_tail = info;
pthread_mutex_unlock(&vtctx->lock);
}
static CMVideoCodecType get_cm_codec_type(enum AVCodecID id)
{
switch (id) {
case AV_CODEC_ID_H264: return kCMVideoCodecType_H264;
default: return 0;
}
}
static void vtenc_free_block(void *opaque, uint8_t *data)
{
CMBlockBufferRef block = opaque;
CFRelease(block);
}
/**
* Get the parameter sets from a CMSampleBufferRef.
* @param dst If *dst isn't NULL, the parameters are copied into existing
* memory. *dst_size must be set accordingly when *dst != NULL.
* If *dst is NULL, it will be allocated.
* In all cases, *dst_size is set to the number of bytes used starting
* at *dst.
*/
static int get_params_size(
AVCodecContext *avctx,
CMVideoFormatDescriptionRef vid_fmt,
size_t *size)
{
size_t total_size = 0;
size_t ps_count;
size_t i;
int status;
status = CMVideoFormatDescriptionGetH264ParameterSetAtIndex(vid_fmt,
0,
NULL,
NULL,
&ps_count,
NULL);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error getting parameter set count: %d\n", status);
return AVERROR_EXTERNAL;
}
for(i = 0; i < ps_count; i++){
const uint8_t *ps;
size_t ps_size;
status = CMVideoFormatDescriptionGetH264ParameterSetAtIndex(vid_fmt,
i,
&ps,
&ps_size,
NULL,
NULL);
if(status){
av_log(avctx, AV_LOG_ERROR, "Error getting parameter set size for index %zd: %d\n", i, status);
return AVERROR_EXTERNAL;
}
total_size += ps_size + sizeof(start_code);
}
*size = total_size;
return 0;
}
static int copy_param_sets(
AVCodecContext *avctx,
CMVideoFormatDescriptionRef vid_fmt,
uint8_t *dst,
size_t dst_size)
{
size_t ps_count;
int status;
size_t offset = 0;
size_t i;
status = CMVideoFormatDescriptionGetH264ParameterSetAtIndex(vid_fmt,
0,
NULL,
NULL,
&ps_count,
NULL);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error getting parameter set count for copying: %d\n", status);
return AVERROR_EXTERNAL;
}
for (i = 0; i < ps_count; i++) {
const uint8_t *ps;
size_t ps_size;
size_t next_offset;
status = CMVideoFormatDescriptionGetH264ParameterSetAtIndex(vid_fmt,
i,
&ps,
&ps_size,
NULL,
NULL);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error getting parameter set data for index %zd: %d\n", i, status);
return AVERROR_EXTERNAL;
}
next_offset = offset + sizeof(start_code) + ps_size;
if (dst_size < next_offset) {
av_log(avctx, AV_LOG_ERROR, "Error: buffer too small for parameter sets.\n");
return AVERROR_BUFFER_TOO_SMALL;
}
memcpy(dst + offset, start_code, sizeof(start_code));
offset += sizeof(start_code);
memcpy(dst + offset, ps, ps_size);
offset = next_offset;
}
return 0;
}
static int set_extradata(AVCodecContext *avctx, CMSampleBufferRef sample_buffer)
{
CMVideoFormatDescriptionRef vid_fmt;
size_t total_size;
int status;
vid_fmt = CMSampleBufferGetFormatDescription(sample_buffer);
if (!vid_fmt) {
av_log(avctx, AV_LOG_ERROR, "No video format.\n");
return AVERROR_EXTERNAL;
}
status = get_params_size(avctx, vid_fmt, &total_size);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Could not get parameter sets.\n");
return status;
}
avctx->extradata = av_malloc(total_size);
if (!avctx->extradata) {
return AVERROR(ENOMEM);
}
avctx->extradata_size = total_size;
status = copy_param_sets(avctx, vid_fmt, avctx->extradata, total_size);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Could not copy param sets.\n");
return status;
}
return 0;
}
static void vtenc_output_callback(
void *ctx,
void *sourceFrameCtx,
OSStatus status,
VTEncodeInfoFlags flags,
CMSampleBufferRef sample_buffer)
{
AVCodecContext *avctx = ctx;
VTEncContext *vtctx = avctx->priv_data;
if (vtctx->async_error) {
if(sample_buffer) CFRelease(sample_buffer);
return;
}
if (status || !sample_buffer) {
av_log(avctx, AV_LOG_ERROR, "Error encoding frame: %d\n", (int)status);
set_async_error(vtctx, AVERROR_EXTERNAL);
return;
}
if (!avctx->extradata && (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER)) {
int set_status = set_extradata(avctx, sample_buffer);
if (set_status) {
set_async_error(vtctx, set_status);
return;
}
}
vtenc_q_push(vtctx, sample_buffer);
}
static int get_length_code_size(
AVCodecContext *avctx,
CMSampleBufferRef sample_buffer,
size_t *size)
{
CMVideoFormatDescriptionRef vid_fmt;
int isize;
int status;
vid_fmt = CMSampleBufferGetFormatDescription(sample_buffer);
if (!vid_fmt) {
av_log(avctx, AV_LOG_ERROR, "Error getting buffer format description.\n");
return AVERROR_EXTERNAL;
}
status = CMVideoFormatDescriptionGetH264ParameterSetAtIndex(vid_fmt,
0,
NULL,
NULL,
NULL,
&isize);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error getting length code size: %d\n", status);
return AVERROR_EXTERNAL;
}
*size = isize;
return 0;
}
/*
* Returns true on success.
*
* If profile_level_val is NULL and this method returns true, don't specify the
* profile/level to the encoder.
*/
static bool get_vt_profile_level(AVCodecContext *avctx,
CFStringRef *profile_level_val)
{
VTEncContext *vtctx = avctx->priv_data;
int64_t profile = vtctx->profile;
if (profile == H264_PROF_AUTO && vtctx->level) {
//Need to pick a profile if level is not auto-selected.
profile = vtctx->has_b_frames ? H264_PROF_MAIN : H264_PROF_BASELINE;
}
*profile_level_val = NULL;
switch (profile) {
case H264_PROF_AUTO:
return true;
case H264_PROF_BASELINE:
switch (vtctx->level) {
case 0: *profile_level_val = kVTProfileLevel_H264_Baseline_AutoLevel; break;
case 13: *profile_level_val = kVTProfileLevel_H264_Baseline_1_3; break;
case 30: *profile_level_val = kVTProfileLevel_H264_Baseline_3_0; break;
case 31: *profile_level_val = kVTProfileLevel_H264_Baseline_3_1; break;
case 32: *profile_level_val = kVTProfileLevel_H264_Baseline_3_2; break;
case 40: *profile_level_val = kVTProfileLevel_H264_Baseline_4_0; break;
case 41: *profile_level_val = kVTProfileLevel_H264_Baseline_4_1; break;
case 42: *profile_level_val = kVTProfileLevel_H264_Baseline_4_2; break;
case 50: *profile_level_val = kVTProfileLevel_H264_Baseline_5_0; break;
case 51: *profile_level_val = kVTProfileLevel_H264_Baseline_5_1; break;
case 52: *profile_level_val = kVTProfileLevel_H264_Baseline_5_2; break;
}
break;
case H264_PROF_MAIN:
switch (vtctx->level) {
case 0: *profile_level_val = kVTProfileLevel_H264_Main_AutoLevel; break;
case 30: *profile_level_val = kVTProfileLevel_H264_Main_3_0; break;
case 31: *profile_level_val = kVTProfileLevel_H264_Main_3_1; break;
case 32: *profile_level_val = kVTProfileLevel_H264_Main_3_2; break;
case 40: *profile_level_val = kVTProfileLevel_H264_Main_4_0; break;
case 41: *profile_level_val = kVTProfileLevel_H264_Main_4_1; break;
case 42: *profile_level_val = kVTProfileLevel_H264_Main_4_2; break;
case 50: *profile_level_val = kVTProfileLevel_H264_Main_5_0; break;
case 51: *profile_level_val = kVTProfileLevel_H264_Main_5_1; break;
case 52: *profile_level_val = kVTProfileLevel_H264_Main_5_2; break;
}
break;
case H264_PROF_HIGH:
switch (vtctx->level) {
case 0: *profile_level_val = kVTProfileLevel_H264_High_AutoLevel; break;
case 30: *profile_level_val = kVTProfileLevel_H264_High_3_0; break;
case 31: *profile_level_val = kVTProfileLevel_H264_High_3_1; break;
case 32: *profile_level_val = kVTProfileLevel_H264_High_3_2; break;
case 40: *profile_level_val = kVTProfileLevel_H264_High_4_0; break;
case 41: *profile_level_val = kVTProfileLevel_H264_High_4_1; break;
case 42: *profile_level_val = kVTProfileLevel_H264_High_4_2; break;
case 50: *profile_level_val = kVTProfileLevel_H264_High_5_0; break;
case 51: *profile_level_val = kVTProfileLevel_H264_High_5_1; break;
case 52: *profile_level_val = kVTProfileLevel_H264_High_5_2; break;
}
break;
}
if (!*profile_level_val) {
av_log(avctx, AV_LOG_ERROR, "Invalid Profile/Level.\n");
return false;
}
return true;
}
static av_cold int vtenc_init(AVCodecContext *avctx)
{
CFMutableDictionaryRef enc_info;
CMVideoCodecType codec_type;
VTEncContext *vtctx = avctx->priv_data;
CFStringRef profile_level;
SInt32 bit_rate = avctx->bit_rate;
CFNumberRef bit_rate_num;
int status;
codec_type = get_cm_codec_type(avctx->codec_id);
if (!codec_type) {
av_log(avctx, AV_LOG_ERROR, "Error: no mapping for AVCodecID %d\n", avctx->codec_id);
return AVERROR(EINVAL);
}
vtctx->has_b_frames = avctx->has_b_frames || avctx->max_b_frames > 0;
if(vtctx->has_b_frames && vtctx->profile == H264_PROF_BASELINE){
av_log(avctx, AV_LOG_WARNING, "Cannot use B-frames with baseline profile. Output will not contain B-frames.\n");
vtctx->has_b_frames = false;
}
if (!get_vt_profile_level(avctx, &profile_level)) return AVERROR(EINVAL);
vtctx->session = NULL;
enc_info = CFDictionaryCreateMutable(
kCFAllocatorDefault,
20,
&kCFCopyStringDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks
);
if (!enc_info) return AVERROR(ENOMEM);
#if !TARGET_OS_IPHONE
CFDictionarySetValue(enc_info, kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder, kCFBooleanTrue);
CFDictionarySetValue(enc_info, kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder, kCFBooleanTrue);
#endif
status = VTCompressionSessionCreate(
kCFAllocatorDefault,
avctx->width,
avctx->height,
codec_type,
enc_info,
NULL,
kCFAllocatorDefault,
vtenc_output_callback,
avctx,
&vtctx->session
);
#if !TARGET_OS_IPHONE
if (status != 0 || !vtctx->session) {
CFDictionaryRemoveValue(enc_info, kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder);
status = VTCompressionSessionCreate(
kCFAllocatorDefault,
avctx->width,
avctx->height,
codec_type,
enc_info,
NULL,
kCFAllocatorDefault,
vtenc_output_callback,
avctx,
&vtctx->session
);
}
#endif
CFRelease(enc_info);
if (status || !vtctx->session) {
av_log(avctx, AV_LOG_ERROR, "Error: cannot create compression session: %d\n", status);
return AVERROR_EXTERNAL;
}
bit_rate_num = CFNumberCreate(kCFAllocatorDefault,
kCFNumberSInt32Type,
&bit_rate);
if (!bit_rate_num) return AVERROR(ENOMEM);
status = VTSessionSetProperty(vtctx->session,
kVTCompressionPropertyKey_AverageBitRate,
bit_rate_num);
CFRelease(bit_rate_num);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error setting bitrate property: %d\n", status);
return AVERROR_EXTERNAL;
}
if (profile_level) {
status = VTSessionSetProperty(vtctx->session,
kVTCompressionPropertyKey_ProfileLevel,
profile_level);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error setting profile/level property: %d\n", status);
return AVERROR_EXTERNAL;
}
}
if (avctx->gop_size > 0) {
CFNumberRef interval = CFNumberCreate(kCFAllocatorDefault,
kCFNumberIntType,
&avctx->gop_size);
status = VTSessionSetProperty(vtctx->session,
kVTCompressionPropertyKey_MaxKeyFrameInterval,
interval);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error setting 'max key-frame interval' property: %d\n", status);
return AVERROR_EXTERNAL;
}
}
if (!vtctx->has_b_frames) {
status = VTSessionSetProperty(vtctx->session,
kVTCompressionPropertyKey_AllowFrameReordering,
kCFBooleanFalse);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error setting 'allow frame reordering' property: %d\n", status);
return AVERROR_EXTERNAL;
}
}
status = VTCompressionSessionPrepareToEncodeFrames(vtctx->session);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error: cannot prepare encoder: %d\n", status);
return AVERROR_EXTERNAL;
}
pthread_mutex_init(&vtctx->lock, NULL);
pthread_cond_init(&vtctx->cv_sample_sent, NULL);
vtctx->dts_delta = vtctx->has_b_frames ? -1 : 0;
return 0;
}
static void vtenc_get_frame_info(CMSampleBufferRef buffer, bool *is_key_frame)
{
CFArrayRef attachments;
CFDictionaryRef attachment;
CFBooleanRef not_sync;
CFIndex len;
attachments = CMSampleBufferGetSampleAttachmentsArray(buffer, false);
len = !attachments ? 0 : CFArrayGetCount(attachments);
if (!len) {
*is_key_frame = true;
return;
}
attachment = CFArrayGetValueAtIndex(attachments, 0);
if (CFDictionaryGetValueIfPresent(attachment,
kCMSampleAttachmentKey_NotSync,
(const void **)&not_sync))
{
*is_key_frame = !CFBooleanGetValue(not_sync);
} else {
*is_key_frame = true;
}
}
/**
* Replaces length codes with H.264 Annex B start codes.
* length_code_size must equal sizeof(start_code).
* On failure, the contents of data may have been modified.
*
* @param length_code_size Byte length of each length code
* @param data Call with NAL units prefixed with length codes.
* On success, the length codes are replace with
* start codes.
* @param size Length of data, excluding any padding.
* @return 0 on success
* AVERROR_BUFFER_TOO_SMALL if length code size is smaller
* than a start code or if a length_code in data specifies
* data beyond the end of its buffer.
*/
static int replace_length_codes(size_t length_code_size,
uint8_t *data,
size_t size)
{
size_t remaining_size = size;
if (length_code_size != sizeof(start_code)) {
av_log(NULL, AV_LOG_ERROR, "Start code size and length code size not equal.\n");
return AVERROR_BUFFER_TOO_SMALL;
}
while (remaining_size > 0) {
size_t box_len = 0;
size_t i;
for (i = 0; i < length_code_size; i++) {
box_len <<= 8;
box_len |= data[i];
}
if (remaining_size < box_len + sizeof(start_code)) {
av_log(NULL, AV_LOG_ERROR, "Length is out of range.\n");
AVERROR_BUFFER_TOO_SMALL;
}
memcpy(data, start_code, sizeof(start_code));
data += box_len + sizeof(start_code);
remaining_size -= box_len + sizeof(start_code);
}
return 0;
}
/**
* Copies NAL units and replaces length codes with
* H.264 Annex B start codes. On failure, the contents of
* dst_data may have been modified.
*
* @param length_code_size Byte length of each length code
* @param src_data NAL units prefixed with length codes.
* @param src_size Length of buffer, excluding any padding.
* @param dst_data Must be zeroed before calling this function.
* Contains the copied NAL units prefixed with
* start codes when the function returns
* successfully.
* @param dst_size Length of dst_data
* @return 0 on success
* AVERROR_INVALIDDATA if length_code_size is invalid
* AVERROR_BUFFER_TOO_SMALL if dst_data is too small
* or if a length_code in src_data specifies data beyond
* the end of its buffer.
*/
static int copy_replace_length_codes(
size_t length_code_size,
const uint8_t *src_data,
size_t src_size,
uint8_t *dst_data,
size_t dst_size)
{
size_t remaining_src_size = src_size;
size_t remaining_dst_size = dst_size;
if (length_code_size > 4) {
return AVERROR_INVALIDDATA;
}
while (remaining_src_size > 0) {
size_t curr_src_len;
size_t curr_dst_len;
size_t box_len = 0;
size_t i;
uint8_t *dst_box;
const uint8_t *src_box;
for (i = 0; i < length_code_size; i++) {
box_len <<= 8;
box_len |= src_data[i];
}
curr_src_len = box_len + length_code_size;
curr_dst_len = box_len + sizeof(start_code);
if (remaining_src_size < curr_src_len) {
return AVERROR_BUFFER_TOO_SMALL;
}
if (remaining_dst_size < curr_dst_len) {
return AVERROR_BUFFER_TOO_SMALL;
}
dst_box = dst_data + sizeof(start_code);
src_box = src_data + length_code_size;
memcpy(dst_data, start_code, sizeof(start_code));
memcpy(dst_box, src_box, box_len);
src_data += curr_src_len;
dst_data += curr_dst_len;
remaining_src_size -= curr_src_len;
remaining_dst_size -= curr_dst_len;
}
return 0;
}
static int vtenc_cm_to_avpacket(
AVCodecContext *avctx,
CMSampleBufferRef sample_buffer,
AVPacket *pkt)
{
VTEncContext *vtctx = avctx->priv_data;
int status;
bool is_key_frame;
bool add_header;
char *buf_data;
size_t length_code_size;
size_t header_size = 0;
size_t in_buf_size;
int64_t dts_delta;
int64_t time_base_num;
CMTime pts;
CMTime dts;
CMBlockBufferRef block;
CMVideoFormatDescriptionRef vid_fmt;
vtenc_get_frame_info(sample_buffer, &is_key_frame);
status = get_length_code_size(avctx, sample_buffer, &length_code_size);
if (status) return status;
add_header = is_key_frame && !(avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER);
if (add_header) {
vid_fmt = CMSampleBufferGetFormatDescription(sample_buffer);
if (!vid_fmt) {
av_log(avctx, AV_LOG_ERROR, "Cannot get format description.\n");
}
int status = get_params_size(avctx, vid_fmt, &header_size);
if (status) return status;
}
block = CMSampleBufferGetDataBuffer(sample_buffer);
if (!block) {
av_log(avctx, AV_LOG_ERROR, "Could not get block buffer from sample buffer.\n");
return AVERROR_EXTERNAL;
}
status = CMBlockBufferGetDataPointer(block, 0, &in_buf_size, NULL, &buf_data);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error: cannot get data pointer: %d\n", status);
return AVERROR_EXTERNAL;
}
size_t out_buf_size = header_size + in_buf_size;
bool can_reuse_cmbuffer = !add_header &&
!pkt->data &&
length_code_size == sizeof(start_code);
av_init_packet(pkt);
if (can_reuse_cmbuffer) {
AVBufferRef* buf_ref = av_buffer_create(
buf_data,
out_buf_size,
vtenc_free_block,
block,
0
);
if (!buf_ref) return AVERROR(ENOMEM);
CFRetain(block);
pkt->buf = buf_ref;
pkt->data = buf_data;
pkt->size = in_buf_size;
status = replace_length_codes(length_code_size, pkt->data, pkt->size);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error replacing length codes: %d\n", status);
return status;
}
} else {
if (!pkt->data) {
status = av_new_packet(pkt, out_buf_size);
if(status) return status;
}
if (pkt->size < out_buf_size) {
av_log(avctx, AV_LOG_ERROR, "Error: packet's buffer is too small.\n");
return AVERROR_BUFFER_TOO_SMALL;
}
if (add_header) {
status = copy_param_sets(avctx, vid_fmt, pkt->data, out_buf_size);
if(status) return status;
}
status = copy_replace_length_codes(
length_code_size,
buf_data,
in_buf_size,
pkt->data + header_size,
pkt->size - header_size
);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error copying packet data: %d", status);
return status;
}
}
if (is_key_frame) {
pkt->flags |= AV_PKT_FLAG_KEY;
}
pts = CMSampleBufferGetPresentationTimeStamp(sample_buffer);
dts = CMSampleBufferGetDecodeTimeStamp (sample_buffer);
dts_delta = vtctx->dts_delta >= 0 ? vtctx->dts_delta : 0;
time_base_num = avctx->time_base.num;
pkt->pts = pts.value / time_base_num;
pkt->dts = dts.value / time_base_num - dts_delta;
return 0;
}
/*
* contiguous_buf_size is 0 if not contiguous, and the size of the buffer
* containing all planes if so.
*/
static int get_cv_pixel_info(
AVCodecContext *avctx,
const AVFrame *frame,
int *color,
int *plane_count,
size_t *widths,
size_t *heights,
size_t *strides,
size_t *contiguous_buf_size)
{
VTEncContext *vtctx = avctx->priv_data;
int av_format = frame->format;
int av_color_range = av_frame_get_color_range(frame);
int i;
switch (av_format) {
case AV_PIX_FMT_NV12:
switch (av_color_range) {
case AVCOL_RANGE_MPEG:
*color = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
break;
case AVCOL_RANGE_JPEG:
*color = kCVPixelFormatType_420YpCbCr8BiPlanarFullRange;
break;
default:
if (!vtctx->warned_color_range) {
vtctx->warned_color_range = true;
av_log(avctx, AV_LOG_WARNING, "Color range not set for NV12. Using MPEG range.\n");
}
*color = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
}
*plane_count = 2;
widths [0] = avctx->width;
heights[0] = avctx->height;
strides[0] = frame ? frame->linesize[0] : avctx->width;
widths [1] = (avctx->width + 1) / 2;
heights[1] = (avctx->height + 1) / 2;
strides[1] = frame ? frame->linesize[1] : (avctx->width + 1) & -2;
break;
case AV_PIX_FMT_YUV420P:
switch (av_color_range) {
case AVCOL_RANGE_MPEG:
*color = kCVPixelFormatType_420YpCbCr8Planar;
break;
case AVCOL_RANGE_JPEG:
*color = kCVPixelFormatType_420YpCbCr8PlanarFullRange;
break;
default:
if (!vtctx->warned_color_range) {
vtctx->warned_color_range = true;
av_log(avctx, AV_LOG_WARNING, "Color range not set for YUV 4:2:0. Using MPEG range.\n");
}
*color = kCVPixelFormatType_420YpCbCr8Planar;
}
*plane_count = 3;
widths [0] = avctx->width;
heights[0] = avctx->height;
strides[0] = frame ? frame->linesize[0] : avctx->width;
widths [1] = (avctx->width + 1) / 2;
heights[1] = (avctx->height + 1) / 2;
strides[1] = frame ? frame->linesize[1] : (avctx->width + 1) / 2;
widths [2] = (avctx->width + 1) / 2;
heights[2] = (avctx->height + 1) / 2;
strides[2] = frame ? frame->linesize[2] : (avctx->width + 1) / 2;
break;
default: return AVERROR(EINVAL);
}
*contiguous_buf_size = 0;
for (i = 0; i < *plane_count; i++) {
if (i < *plane_count - 1 &&
frame->data[i] + strides[i] * heights[i] != frame->data[i + 1]) {
*contiguous_buf_size = 0;
break;
}
*contiguous_buf_size += strides[i] * heights[i];
}
return 0;
}
#if !TARGET_OS_IPHONE
//Not used on iOS - frame is always copied.
static void free_avframe(
void *release_ctx,
const void *data,
size_t size,
size_t plane_count,
const void *plane_addresses[])
{
AVFrame *frame = release_ctx;
av_frame_free(&frame);
}
#else
//Not used on OSX - frame is never copied.
static int copy_avframe_to_pixel_buffer(AVCodecContext *avctx,
const AVFrame *frame,
CVPixelBufferRef cv_img,
const size_t *plane_strides,
const size_t *plane_rows)
{
int i, j;
size_t plane_count;
int status;
int rows;
int src_stride;
int dst_stride;
uint8_t *src_addr;
uint8_t *dst_addr;
size_t copy_bytes;
status = CVPixelBufferLockBaseAddress(cv_img, 0);
if (status) {
av_log(
avctx,
AV_LOG_ERROR,
"Error: Could not lock base address of CVPixelBuffer: %d.\n",
status
);
}
if (CVPixelBufferIsPlanar(cv_img)) {
plane_count = CVPixelBufferGetPlaneCount(cv_img);
for (i = 0; frame->data[i]; i++) {
if (i == plane_count) {
CVPixelBufferUnlockBaseAddress(cv_img, 0);
av_log(avctx,
AV_LOG_ERROR,
"Error: different number of planes in AVFrame and CVPixelBuffer.\n"
);
return AVERROR_EXTERNAL;
}
dst_addr = (uint8_t*)CVPixelBufferGetBaseAddressOfPlane(cv_img, i);
src_addr = (uint8_t*)frame->data[i];
dst_stride = CVPixelBufferGetBytesPerRowOfPlane(cv_img, i);
src_stride = plane_strides[i];
rows = plane_rows[i];
if (dst_stride == src_stride) {
memcpy(dst_addr, src_addr, src_stride * rows);
} else {
copy_bytes = dst_stride < src_stride ? dst_stride : src_stride;
for (j = 0; j < rows; j++) {
memcpy(dst_addr + j * dst_stride, src_addr + j * src_stride, copy_bytes);
}
}
}
} else {
if (frame->data[1]) {
CVPixelBufferUnlockBaseAddress(cv_img, 0);
av_log(avctx,
AV_LOG_ERROR,
"Error: different number of planes in AVFrame and non-planar CVPixelBuffer.\n"
);
return AVERROR_EXTERNAL;
}
dst_addr = (uint8_t*)CVPixelBufferGetBaseAddress(cv_img);
src_addr = (uint8_t*)frame->data[0];
dst_stride = CVPixelBufferGetBytesPerRow(cv_img);
src_stride = plane_strides[0];
rows = plane_rows[0];
if (dst_stride == src_stride) {
memcpy(dst_addr, src_addr, src_stride * rows);
} else {
copy_bytes = dst_stride < src_stride ? dst_stride : src_stride;
for (j = 0; j < rows; j++) {
memcpy(dst_addr + j * dst_stride, src_addr + j * src_stride, copy_bytes);
}
}
}
status = CVPixelBufferUnlockBaseAddress(cv_img, 0);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error: Could not unlock CVPixelBuffer base address: %d.\n", status);
return AVERROR_EXTERNAL;
}
return 0;
}
#endif //!TARGET_OS_IPHONE
static int create_cv_pixel_buffer(AVCodecContext *avctx,
const AVFrame *frame,
CVPixelBufferRef *cv_img)
{
int plane_count;
int color;
size_t widths [AV_NUM_DATA_POINTERS];
size_t heights[AV_NUM_DATA_POINTERS];
size_t strides[AV_NUM_DATA_POINTERS];
int status;
size_t contiguous_buf_size;
memset(widths, 0, sizeof(widths));
memset(heights, 0, sizeof(heights));
memset(strides, 0, sizeof(strides));
status = get_cv_pixel_info(
avctx,
frame,
&color,
&plane_count,
widths,
heights,
strides,
&contiguous_buf_size
);
if (status) {
av_log(
avctx,
AV_LOG_ERROR,
"Error: Cannot convert format %d color_range %d: %d\n",
frame->format,
av_frame_get_color_range(frame),
status
);
return AVERROR_EXTERNAL;
}
#if TARGET_OS_IPHONE
status = CVPixelBufferCreate(
kCFAllocatorDefault,
frame->width,
frame->height,
color,
NULL,
cv_img
);
if (status) {
return AVERROR_EXTERNAL;
}
status = copy_avframe_to_pixel_buffer(avctx, frame, *cv_img, strides, heights);
if (status) {
CFRelease(*cv_img);
*cv_img = NULL;
return status;
}
#else
AVFrame *enc_frame = av_frame_alloc();
if (!enc_frame) return AVERROR(ENOMEM);
status = av_frame_ref(enc_frame, frame);
if (status) {
av_frame_free(&enc_frame);
return status;
}
status = CVPixelBufferCreateWithPlanarBytes(
kCFAllocatorDefault,
enc_frame->width,
enc_frame->height,
color,
NULL,
contiguous_buf_size,
plane_count,
(void **)enc_frame->data,
widths,
heights,
strides,
free_avframe,
enc_frame,
NULL,
cv_img
);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error: Could not create CVPixelBuffer: %d\n", status);
return AVERROR_EXTERNAL;
}
#endif
return 0;
}
static int vtenc_send_frame(AVCodecContext *avctx,
VTEncContext *vtctx,
const AVFrame *frame)
{
CMTime time;
CVPixelBufferRef cv_img = NULL;
int status = create_cv_pixel_buffer(avctx, frame, &cv_img);
if (status) return status;
time = CMTimeMake(frame->pts * avctx->time_base.num, avctx->time_base.den);
status = VTCompressionSessionEncodeFrame(
vtctx->session,
cv_img,
time,
kCMTimeInvalid,
NULL,
NULL,
NULL
);
CFRelease(cv_img);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error: cannot encode frame: %d\n", status);
return AVERROR_EXTERNAL;
}
return 0;
}
static av_cold int vtenc_frame(
AVCodecContext *avctx,
AVPacket *pkt,
const AVFrame *frame,
int *got_packet)
{
VTEncContext *vtctx = avctx->priv_data;
bool get_frame;
int status;
CMSampleBufferRef buf = NULL;
if (frame) {
status = vtenc_send_frame(avctx, vtctx, frame);
if (status) {
status = AVERROR_EXTERNAL;
goto end_nopkt;
}
if (vtctx->frame_ct_in == 0) {
vtctx->first_pts = frame->pts;
} else if(vtctx->frame_ct_in == 1 && vtctx->has_b_frames) {
vtctx->dts_delta = frame->pts - vtctx->first_pts;
}
vtctx->frame_ct_in++;
} else if(!vtctx->flushing) {
vtctx->flushing = true;
status = VTCompressionSessionCompleteFrames(vtctx->session,
kCMTimeIndefinite);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error flushing frames: %d\n", status);
status = AVERROR_EXTERNAL;
goto end_nopkt;
}
}
*got_packet = 0;
get_frame = vtctx->dts_delta >= 0 || !frame;
if (!get_frame) {
status = 0;
goto end_nopkt;
}
status = vtenc_q_pop(vtctx, !frame, &buf);
if (status) goto end_nopkt;
if (!buf) goto end_nopkt;
status = vtenc_cm_to_avpacket(avctx, buf, pkt);
CFRelease(buf);
if (status) goto end_nopkt;
*got_packet = 1;
return 0;
end_nopkt:
av_packet_unref(pkt);
return status;
}
static av_cold int vtenc_close(AVCodecContext *avctx)
{
VTEncContext *vtctx = avctx->priv_data;
if(!vtctx->session) return 0;
VTCompressionSessionInvalidate(vtctx->session);
pthread_cond_destroy(&vtctx->cv_sample_sent);
pthread_mutex_destroy(&vtctx->lock);
CFRelease(vtctx->session);
vtctx->session = NULL;
return 0;
}
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_NV12,
#if !TARGET_OS_IPHONE
AV_PIX_FMT_YUV420P,
#endif
AV_PIX_FMT_NONE
};
#define OFFSET(x) offsetof(VTEncContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "profile", "Profile", OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = H264_PROF_AUTO }, H264_PROF_AUTO, H264_PROF_COUNT, VE, "profile" },
{ "baseline", "Baseline Profile", 0, AV_OPT_TYPE_CONST, { .i64 = H264_PROF_BASELINE }, INT_MIN, INT_MAX, VE, "profile" },
{ "main", "Main Profile", 0, AV_OPT_TYPE_CONST, { .i64 = H264_PROF_MAIN }, INT_MIN, INT_MAX, VE, "profile" },
{ "high", "High Profile", 0, AV_OPT_TYPE_CONST, { .i64 = H264_PROF_HIGH }, INT_MIN, INT_MAX, VE, "profile" },
{ "level", "Level", OFFSET(level), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 52, VE, "level" },
{ "1.3", "Level 1.3, only available with Baseline Profile", 0, AV_OPT_TYPE_CONST, { .i64 = 13 }, INT_MIN, INT_MAX, VE, "level" },
{ "3.0", "Level 3.0", 0, AV_OPT_TYPE_CONST, { .i64 = 30 }, INT_MIN, INT_MAX, VE, "level" },
{ "3.1", "Level 3.1", 0, AV_OPT_TYPE_CONST, { .i64 = 31 }, INT_MIN, INT_MAX, VE, "level" },
{ "3.2", "Level 3.2", 0, AV_OPT_TYPE_CONST, { .i64 = 32 }, INT_MIN, INT_MAX, VE, "level" },
{ "4.0", "Level 4.0", 0, AV_OPT_TYPE_CONST, { .i64 = 40 }, INT_MIN, INT_MAX, VE, "level" },
{ "4.1", "Level 4.1", 0, AV_OPT_TYPE_CONST, { .i64 = 41 }, INT_MIN, INT_MAX, VE, "level" },
{ "4.2", "Level 4.2", 0, AV_OPT_TYPE_CONST, { .i64 = 42 }, INT_MIN, INT_MAX, VE, "level" },
{ "5.0", "Level 5.0", 0, AV_OPT_TYPE_CONST, { .i64 = 50 }, INT_MIN, INT_MAX, VE, "level" },
{ "5.1", "Level 5.1", 0, AV_OPT_TYPE_CONST, { .i64 = 51 }, INT_MIN, INT_MAX, VE, "level" },
{ "5.2", "Level 5.2", 0, AV_OPT_TYPE_CONST, { .i64 = 52 }, INT_MIN, INT_MAX, VE, "level" },
{ NULL },
};
static const AVClass h264_videotoolbox_class = {
.class_name = "h264_videotoolbox",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_h264_videotoolbox_encoder = {
.name = "h264_videotoolbox",
.long_name = NULL_IF_CONFIG_SMALL("VideoToolbox H.264 Encoder"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.priv_data_size = sizeof(VTEncContext),
.pix_fmts = pix_fmts,
.init = vtenc_init,
.encode2 = vtenc_frame,
.close = vtenc_close,
.capabilities = AV_CODEC_CAP_DELAY,
.priv_class = &h264_videotoolbox_class,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};