cog/Plugins/FFMPEG/FFMPEGDecoder.m

506 lines
14 KiB
Objective-C

//
// FFMPEGDecoder.m
// FFMPEG
//
// Created by Andre Reffhaug on 2/26/08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//
// test
#import "FFMPEGDecoder.h"
#include <pthread.h>
#import "Logging.h"
#define ST_BUFF 2048
int ffmpeg_read(void *opaque, uint8_t *buf, int buf_size)
{
id source = (__bridge id) opaque;
return (int) [source read:buf amount:buf_size];
}
int ffmpeg_write(void *opaque, uint8_t *buf, int buf_size)
{
return -1;
}
int64_t ffmpeg_seek(void *opaque, int64_t offset, int whence)
{
id source = (__bridge id) opaque;
if (whence & AVSEEK_SIZE)
{
if ([source seekable])
{
int64_t curOffset = [source tell];
[source seek:0 whence:SEEK_END];
int64_t size = [source tell];
[source seek:curOffset whence:SEEK_SET];
return size;
}
return -1;
}
whence &= ~(AVSEEK_SIZE | AVSEEK_FORCE);
return [source seekable] ? ([source seek:offset whence:whence] ? [source tell] : -1) : -1;
}
@implementation FFMPEGDecoder
int lockmgr_callback(void ** mutex, enum AVLockOp op)
{
switch (op)
{
case AV_LOCK_CREATE:
*mutex = malloc(sizeof(pthread_mutex_t));
pthread_mutex_init(*mutex, NULL);
break;
case AV_LOCK_DESTROY:
pthread_mutex_destroy(*mutex);
free(*mutex);
*mutex = NULL;
break;
case AV_LOCK_OBTAIN:
pthread_mutex_lock(*mutex);
break;
case AV_LOCK_RELEASE:
pthread_mutex_unlock(*mutex);
break;
}
return 0;
}
+ (void)initialize
{
if(self == [FFMPEGDecoder class])
{
av_log_set_flags(AV_LOG_SKIP_REPEATED);
av_log_set_level(AV_LOG_ERROR);
}
}
- (id)init
{
self = [super init];
if (self) {
lastReadPacket = NULL;
lastDecodedFrame = NULL;
codecCtx = NULL;
formatCtx = NULL;
ioCtx = NULL;
buffer = NULL;
}
return self;
}
- (BOOL)open:(id<CogSource>)s
{
int errcode, i;
AVStream *stream;
source = s;
formatCtx = NULL;
totalFrames = 0;
framesRead = 0;
// register all available codecs
buffer = av_malloc(128 * 1024);
if (!buffer)
{
ALog(@"Out of memory!");
return NO;
}
ioCtx = avio_alloc_context(buffer, 128 * 1024, 0, (__bridge void *)source, ffmpeg_read, ffmpeg_write, ffmpeg_seek);
if (!ioCtx)
{
ALog(@"Unable to create AVIO context");
return NO;
}
formatCtx = avformat_alloc_context();
if (!formatCtx)
{
ALog(@"Unable to allocate AVFormat context");
return NO;
}
formatCtx->pb = ioCtx;
if ((errcode = avformat_open_input(&formatCtx, "", NULL, NULL)) < 0)
{
char errDescr[4096];
av_strerror(errcode, errDescr, 4096);
ALog(@"Error opening file, errcode = %d, error = %s", errcode, errDescr);
return NO;
}
if((errcode = avformat_find_stream_info(formatCtx, NULL)) < 0)
{
char errDescr[4096];
av_strerror(errcode, errDescr, 4096);
ALog(@"Can't find stream info, errcode = %d, error = %s", errcode, errDescr);
return NO;
}
streamIndex = -1;
AVCodecParameters *codecPar;
for(i = 0; i < formatCtx->nb_streams; i++) {
stream = formatCtx->streams[i];
codecPar = stream->codecpar;
if(streamIndex < 0 && codecPar->codec_type == AVMEDIA_TYPE_AUDIO)
{
DLog(@"audio codec found");
streamIndex = i;
}
else
{
stream->discard = AVDISCARD_ALL;
}
}
if ( streamIndex < 0 ) {
ALog(@"no audio codec found");
return NO;
}
stream = formatCtx->streams[streamIndex];
codecPar = stream->codecpar;
codecCtx = avcodec_alloc_context3(NULL);
if (!codecCtx)
{
ALog(@"could not allocate codec context");
return NO;
}
if ( (errcode = avcodec_parameters_to_context(codecCtx, codecPar)) < 0 )
{
char errDescr[4096];
av_strerror(errcode, errDescr, 4096);
ALog(@"Can't copy codec parameters to context, errcode = %d, error = %s", errcode, errDescr);
return NO;
}
AVCodec * codec = avcodec_find_decoder(codecCtx->codec_id);
if (!codec) {
ALog(@"codec not found");
return NO;
}
if ( (errcode = avcodec_open2(codecCtx, codec, NULL)) < 0) {
char errDescr[4096];
av_strerror(errcode, errDescr, 4096);
ALog(@"could not open codec, errcode = %d, error = %s", errcode, errDescr);
return NO;
}
lastDecodedFrame = av_frame_alloc();
av_frame_unref(lastDecodedFrame);
lastReadPacket = malloc(sizeof(AVPacket));
av_new_packet(lastReadPacket, 0);
readNextPacket = YES;
bytesConsumedFromDecodedFrame = INT_MAX;
seekFrame = -1;
frequency = codecCtx->sample_rate;
channels = codecCtx->channels;
floatingPoint = NO;
switch (codecCtx->sample_fmt) {
case AV_SAMPLE_FMT_U8:
case AV_SAMPLE_FMT_U8P:
bitsPerSample = 8;
break;
case AV_SAMPLE_FMT_S16:
case AV_SAMPLE_FMT_S16P:
bitsPerSample = 16;
break;
case AV_SAMPLE_FMT_S32:
case AV_SAMPLE_FMT_S32P:
bitsPerSample = 32;
break;
case AV_SAMPLE_FMT_FLT:
case AV_SAMPLE_FMT_FLTP:
bitsPerSample = 32;
floatingPoint = YES;
break;
case AV_SAMPLE_FMT_DBL:
case AV_SAMPLE_FMT_DBLP:
bitsPerSample = 64;
floatingPoint = YES;
break;
default:
return NO;
}
//totalFrames = codecCtx->sample_rate * ((float)formatCtx->duration/AV_TIME_BASE);
AVRational tb = {.num = 1, .den = codecCtx->sample_rate};
totalFrames = av_rescale_q(stream->duration, stream->time_base, tb);
bitrate = (int)((codecCtx->bit_rate) / 1000);
framesRead = 0;
endOfStream = NO;
endOfAudio = NO;
if ( totalFrames < 0 )
totalFrames = 0;
seekable = [s seekable];
return YES;
}
- (void)close
{
if (lastReadPacket)
{
av_packet_unref(lastReadPacket);
free(lastReadPacket);
lastReadPacket = NULL;
}
if (lastDecodedFrame) { av_free(lastDecodedFrame); lastDecodedFrame = NULL; }
if (codecCtx) { avcodec_close(codecCtx); avcodec_free_context(&codecCtx); codecCtx = NULL; }
if (formatCtx) { avformat_close_input(&(formatCtx)); formatCtx = NULL; }
if (ioCtx) { buffer = ioCtx->buffer; av_free(ioCtx); ioCtx = NULL; }
if (buffer) { av_free(buffer); buffer = NULL; }
}
- (void)dealloc
{
[self close];
}
- (int)readAudio:(void *)buf frames:(UInt32)frames
{
if ( totalFrames && framesRead >= totalFrames )
return 0;
int frameSize = channels * (bitsPerSample / 8);
int dataSize = 0;
int bytesToRead = frames * frameSize;
int bytesRead = 0;
int seekBytesSkip = 0;
int errcode;
int8_t* targetBuf = (int8_t*) buf;
memset(buf, 0, bytesToRead);
while (bytesRead < bytesToRead)
{
// buffer size needed to hold decoded samples, in bytes
int planeSize;
int planar = av_sample_fmt_is_planar(codecCtx->sample_fmt);
dataSize = av_samples_get_buffer_size(&planeSize, codecCtx->channels,
lastDecodedFrame->nb_samples,
codecCtx->sample_fmt, 1);
if ( dataSize < 0 )
dataSize = 0;
while(readNextPacket && !endOfAudio)
{
// consume next chunk of encoded data from input stream
if (!endOfStream)
{
av_packet_unref(lastReadPacket);
if((errcode = av_read_frame(formatCtx, lastReadPacket)) < 0)
{
if (errcode == AVERROR_EOF)
{
DLog(@"End of stream");
endOfStream = YES;
}
if (formatCtx->pb && formatCtx->pb->error) break;
}
if (lastReadPacket->stream_index != streamIndex)
continue;
}
if ((errcode = avcodec_send_packet(codecCtx, endOfStream ? NULL : lastReadPacket)) < 0)
{
if (errcode != AVERROR(EAGAIN))
{
char errDescr[4096];
av_strerror(errcode, errDescr, 4096);
ALog(@"Error sending packet to codec, errcode = %d, error = %s", errcode, errDescr);
return 0;
}
}
readNextPacket = NO; // we probably won't need to consume another chunk
// FFmpeg seeking by packet is usually inexact, so skip up to
// target sample using packet timestamp
if (seekFrame >= 0 && errcode >= 0) {
DLog(@"Seeking to frame %lld", seekFrame);
AVRational tb = {.num = 1, .den = codecCtx->sample_rate};
int64_t packetBeginFrame = av_rescale_q(
lastReadPacket->dts,
formatCtx->streams[streamIndex]->time_base,
tb
);
if (packetBeginFrame < seekFrame) {
seekBytesSkip += (int)((seekFrame - packetBeginFrame) * frameSize);
}
seekFrame = -1;
}
}
if (dataSize <= bytesConsumedFromDecodedFrame)
{
if (endOfStream && endOfAudio)
break;
bytesConsumedFromDecodedFrame = 0;
if ((errcode = avcodec_receive_frame(codecCtx, lastDecodedFrame)) < 0)
{
if (errcode == AVERROR_EOF)
{
endOfAudio = YES;
break;
}
else if (errcode == AVERROR(EAGAIN))
{
// Read another packet
readNextPacket = YES;
continue;
}
else
{
char errDescr[4096];
av_strerror(errcode, errDescr, 4096);
ALog(@"Error receiving frame, errcode = %d, error = %s", errcode, errDescr);
return 0;
}
}
// Something has been successfully decoded
dataSize = av_samples_get_buffer_size(&planeSize, codecCtx->channels,
lastDecodedFrame->nb_samples,
codecCtx->sample_fmt, 1);
if ( dataSize < 0 )
dataSize = 0;
int minSkipped = FFMIN(dataSize, seekBytesSkip);
bytesConsumedFromDecodedFrame += minSkipped;
seekBytesSkip -= minSkipped;
}
int toConsume = FFMIN((dataSize - bytesConsumedFromDecodedFrame), (bytesToRead - bytesRead));
// copy decoded samples to Cog's buffer
if (!planar || channels == 1) {
memmove(targetBuf + bytesRead, (lastDecodedFrame->data[0] + bytesConsumedFromDecodedFrame), toConsume);
}
else {
uint8_t * out = ( uint8_t * ) targetBuf + bytesRead;
int bytesPerSample = bitsPerSample / 8;
int bytesConsumedPerPlane = bytesConsumedFromDecodedFrame / channels;
int toConsumePerPlane = toConsume / channels;
for (int s = 0; s < toConsumePerPlane; s += bytesPerSample) {
for (int ch = 0; ch < channels; ++ch) {
memcpy(out, lastDecodedFrame->extended_data[ch] + bytesConsumedPerPlane + s, bytesPerSample);
out += bytesPerSample;
}
}
}
bytesConsumedFromDecodedFrame += toConsume;
bytesRead += toConsume;
}
int framesReadNow = bytesRead / frameSize;
if ( totalFrames && ( framesRead + framesReadNow > totalFrames ) )
framesReadNow = (int)(totalFrames - framesRead);
framesRead += framesReadNow;
return framesReadNow;
}
- (long)seek:(long)frame
{
if ( !totalFrames )
return -1;
if (frame >= totalFrames)
{
framesRead = totalFrames;
endOfStream = YES;
endOfAudio = YES;
return -1;
}
int64_t ts = frame * (formatCtx->duration) / totalFrames;
avformat_seek_file(formatCtx, -1, ts - 1000, ts, ts, AVSEEK_FLAG_ANY);
avcodec_flush_buffers(codecCtx);
readNextPacket = YES; // so we immediately read next packet
bytesConsumedFromDecodedFrame = INT_MAX; // so we immediately begin decoding next frame
framesRead = frame;
seekFrame = frame;
endOfStream = NO;
endOfAudio = NO;
return frame;
}
- (NSDictionary *)properties
{
return [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:channels], @"channels",
[NSNumber numberWithInt:bitsPerSample], @"bitsPerSample",
[NSNumber numberWithBool:(bitsPerSample == 8)], @"Unsigned",
[NSNumber numberWithFloat:frequency], @"sampleRate",
[NSNumber numberWithBool:floatingPoint], @"floatingPoint",
[NSNumber numberWithDouble:totalFrames], @"totalFrames",
[NSNumber numberWithInt:bitrate], @"bitrate",
[NSNumber numberWithBool:seekable], @"seekable",
@"host", @"endian",
nil];
}
+ (NSArray *)fileTypes
{
return [NSArray arrayWithObjects:@"wma", @"asf", @"tak", @"mp3", @"mp2", @"m2a", @"mpa", @"ape", @"ac3", @"dts", @"dtshd", @"wav", @"tta", @"vqf", @"vqe", @"vql", @"ra", @"rm", @"rmj", nil];
}
+ (NSArray *)mimeTypes
{
return [NSArray arrayWithObjects:@"application/wma", @"application/x-wma", @"audio/x-wma", @"audio/x-ms-wma", @"audio/x-tak", @"audio/mpeg", @"audio/x-mp3", @"audio/x-mp2", @"audio/x-ape", @"audio/x-ac3", @"audio/x-dts", @"audio/x-dtshd", @"audio/x-at3", @"audio/wav", @"audio/tta", @"audio/x-tta", @"audio/x-twinvq", nil];
}
+ (float)priority
{
return 1.0;
}
@end