340 lines
9.8 KiB
Objective-C
340 lines
9.8 KiB
Objective-C
//
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// FFMPEGDecoder.m
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// FFMPEG
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//
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// Created by Andre Reffhaug on 2/26/08.
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// Copyright 2008 __MyCompanyName__. All rights reserved.
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//
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// test
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#import "FFMPEGDecoder.h"
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#import "FFMPEGFileProtocols.h"
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#include <pthread.h>
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#import "Logging.h"
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#define ST_BUFF 2048
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@implementation FFMPEGDecoder
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int lockmgr_callback(void ** mutex, enum AVLockOp op)
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{
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switch (op)
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{
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case AV_LOCK_CREATE:
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*mutex = malloc(sizeof(pthread_mutex_t));
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pthread_mutex_init(*mutex, NULL);
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break;
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case AV_LOCK_DESTROY:
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pthread_mutex_destroy(*mutex);
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free(*mutex);
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*mutex = NULL;
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break;
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case AV_LOCK_OBTAIN:
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pthread_mutex_lock(*mutex);
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break;
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case AV_LOCK_RELEASE:
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pthread_mutex_unlock(*mutex);
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break;
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}
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return 0;
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}
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+ (void)initialize
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{
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if(self == [FFMPEGDecoder class])
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{
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av_log_set_flags(AV_LOG_SKIP_REPEATED);
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av_log_set_level(AV_LOG_ERROR);
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av_register_all();
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registerCogProtocols();
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av_lockmgr_register(lockmgr_callback);
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}
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}
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- (BOOL)open:(id<CogSource>)s
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{
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int errcode, i;
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const char *filename = [[[[s url] absoluteString] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding] UTF8String];
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formatCtx = NULL;
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totalFrames = 0;
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framesRead = 0;
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// register all available codecs
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if ((errcode = avformat_open_input(&formatCtx, filename, NULL, NULL)) < 0)
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{
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char errDescr[4096];
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av_strerror(errcode, errDescr, 4096);
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ALog(@"ERROR OPENING FILE, errcode = %d, error = %s", errcode, errDescr);
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return NO;
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}
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if(avformat_find_stream_info(formatCtx, NULL) < 0)
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{
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ALog(@"CAN'T FIND STREAM INFO!");
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return NO;
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}
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streamIndex = -1;
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for(i = 0; i < formatCtx->nb_streams; i++) {
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codecCtx = formatCtx->streams[i]->codec;
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if(codecCtx->codec_type == AVMEDIA_TYPE_AUDIO)
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{
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DLog(@"audio codec found");
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streamIndex = i;
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break;
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}
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}
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if ( streamIndex < 0 ) {
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ALog(@"no audio codec found");
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return NO;
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}
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AVCodec * codec = avcodec_find_decoder(codecCtx->codec_id);
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if (!codec) {
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ALog(@"codec not found");
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return NO;
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}
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if (avcodec_open2(codecCtx, codec, NULL) < 0) {
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ALog(@"could not open codec");
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return NO;
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}
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lastDecodedFrame = avcodec_alloc_frame();
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avcodec_get_frame_defaults(lastDecodedFrame);
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lastReadPacket = malloc(sizeof(AVPacket));
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av_new_packet(lastReadPacket, 0);
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readNextPacket = YES;
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bytesConsumedFromDecodedFrame = INT_MAX;
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frequency = codecCtx->sample_rate;
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channels = codecCtx->channels;
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floatingPoint = NO;
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switch (codecCtx->sample_fmt) {
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case AV_SAMPLE_FMT_U8:
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case AV_SAMPLE_FMT_U8P:
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bitsPerSample = 8;
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break;
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case AV_SAMPLE_FMT_S16:
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case AV_SAMPLE_FMT_S16P:
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bitsPerSample = 16;
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break;
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case AV_SAMPLE_FMT_S32:
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case AV_SAMPLE_FMT_S32P:
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bitsPerSample = 32;
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break;
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case AV_SAMPLE_FMT_FLT:
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case AV_SAMPLE_FMT_FLTP:
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bitsPerSample = 32;
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floatingPoint = YES;
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break;
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case AV_SAMPLE_FMT_DBL:
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case AV_SAMPLE_FMT_DBLP:
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bitsPerSample = 64;
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floatingPoint = YES;
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break;
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default:
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return NO;
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}
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totalFrames = codecCtx->sample_rate * ((float)formatCtx->duration/AV_TIME_BASE);
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bitrate = (codecCtx->bit_rate) / 1000;
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framesRead = 0;
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seekable = [s seekable];
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return YES;
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}
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- (void)close
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{
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if (lastReadPacket)
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{
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av_free_packet(lastReadPacket);
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free(lastReadPacket);
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lastReadPacket = NULL;
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}
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if (lastDecodedFrame) { av_free(lastDecodedFrame); lastDecodedFrame = NULL; }
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if (codecCtx) { avcodec_close(codecCtx); codecCtx = NULL; }
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if (formatCtx) { avformat_close_input(&(formatCtx)); formatCtx = NULL; }
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}
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- (int)readAudio:(void *)buf frames:(UInt32)frames
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{
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int frameSize = channels * (bitsPerSample / 8);
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int gotFrame = 0;
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int dataSize = 0;
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int bytesToRead = frames * frameSize;
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int bytesRead = 0;
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BOOL endOfStream = NO;
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int8_t* targetBuf = (int8_t*) buf;
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memset(buf, 0, bytesToRead);
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while (bytesRead < bytesToRead)
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{
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// buffer size needed to hold decoded samples, in bytes
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int planeSize;
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int planar = av_sample_fmt_is_planar(codecCtx->sample_fmt);
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dataSize = av_samples_get_buffer_size(&planeSize, codecCtx->channels,
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lastDecodedFrame->nb_samples,
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codecCtx->sample_fmt, 1);
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if(readNextPacket && !endOfStream)
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{
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// consume next chunk of encoded data from input stream
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av_free_packet(lastReadPacket);
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if(av_read_frame(formatCtx, lastReadPacket) < 0)
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{
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DLog(@"End of stream");
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endOfStream = YES;
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if (dataSize <= bytesConsumedFromDecodedFrame)
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break; // end of stream;
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}
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readNextPacket = NO; // we probably won't need to consume another chunk
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bytesReadFromPacket = 0; // until this one is fully decoded
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}
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if (dataSize <= bytesConsumedFromDecodedFrame)
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{
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if (endOfStream)
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break;
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// consumed all decoded samples - decode more
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avcodec_get_frame_defaults(lastDecodedFrame);
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bytesConsumedFromDecodedFrame = 0;
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int len = avcodec_decode_audio4(codecCtx, lastDecodedFrame, &gotFrame, lastReadPacket);
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if (len < 0 || (!gotFrame))
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{
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char errbuf[4096];
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av_strerror(len, errbuf, 4096);
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ALog(@"Error decoding: len = %d, gotFrame = %d, strerr = %s", len, gotFrame, errbuf);
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dataSize = 0;
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readNextPacket = YES;
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}
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else
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{
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// Something has been successfully decoded
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dataSize = av_samples_get_buffer_size(&planeSize, codecCtx->channels,
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lastDecodedFrame->nb_samples,
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codecCtx->sample_fmt, 1);
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bytesReadFromPacket += len;
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}
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if (bytesReadFromPacket >= lastReadPacket->size)
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{
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// decoding consumed all the read packet - read another next time
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readNextPacket = YES;
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}
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else
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{
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lastReadPacket->data += len;
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lastReadPacket->size -= len;
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}
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}
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int toConsume = FFMIN((dataSize - bytesConsumedFromDecodedFrame), (bytesToRead - bytesRead));
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// copy decoded samples to Cog's buffer
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if (!planar || channels == 1) {
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memmove(targetBuf + bytesRead, (lastDecodedFrame->data[0] + bytesConsumedFromDecodedFrame), toConsume);
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}
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else {
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uint8_t * out = ( uint8_t * ) targetBuf + bytesRead;
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int bytesPerSample = bitsPerSample / 8;
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int bytesConsumedPerPlane = bytesConsumedFromDecodedFrame / channels;
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int toConsumePerPlane = toConsume / channels;
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for (int s = 0; s < toConsumePerPlane; s += bytesPerSample) {
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for (int ch = 0; ch < channels; ++ch) {
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memcpy(out, lastDecodedFrame->extended_data[ch] + bytesConsumedPerPlane + s, bytesPerSample);
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out += bytesPerSample;
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}
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}
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}
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bytesConsumedFromDecodedFrame += toConsume;
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bytesRead += toConsume;
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}
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int framesReadNow = bytesRead / frameSize;
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if ( framesRead + framesReadNow > totalFrames )
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framesReadNow = totalFrames - framesRead;
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framesRead += framesReadNow;
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return framesReadNow;
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}
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- (long)seek:(long)frame
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{
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if (frame >= totalFrames) { return -1; }
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int64_t ts = frame * (formatCtx->duration) / totalFrames;
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avformat_seek_file(formatCtx, -1, ts - 1000, ts, ts, AVSEEK_FLAG_ANY);
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avcodec_flush_buffers(codecCtx);
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readNextPacket = YES; // so we immediately read next packet
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bytesConsumedFromDecodedFrame = INT_MAX; // so we immediately begin decoding next frame
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framesRead = frame;
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return frame;
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}
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- (NSDictionary *)properties
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{
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return [NSDictionary dictionaryWithObjectsAndKeys:
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[NSNumber numberWithInt:channels], @"channels",
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[NSNumber numberWithInt:bitsPerSample], @"bitsPerSample",
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[NSNumber numberWithBool:(bitsPerSample == 8)], @"Unsigned",
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[NSNumber numberWithFloat:frequency], @"sampleRate",
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[NSNumber numberWithBool:floatingPoint], @"floatingPoint",
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[NSNumber numberWithDouble:totalFrames], @"totalFrames",
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[NSNumber numberWithInt:bitrate], @"bitrate",
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[NSNumber numberWithBool:seekable], @"seekable",
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@"host", @"endian",
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nil];
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}
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+ (NSArray *)fileTypes
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{
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return [NSArray arrayWithObjects:@"wma", @"asf", @"xwma", @"tak", @"mp3", @"mp2", @"m2a", @"mpa", @"ape", @"ac3", @"dts", @"dtshd", @"at3", @"wav", @"tta", @"vqf", @"vqe", @"vql", nil];
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}
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+ (NSArray *)mimeTypes
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{
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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];
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}
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+ (float)priority
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{
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return 1.0;
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}
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@end
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