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vdr-plugin-softhddevice/codec.c

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///
/// @file codec.c @brief Codec functions
///
/// Copyright (c) 2009 - 2012 by Johns. All Rights Reserved.
///
/// Contributor(s):
///
/// License: AGPLv3
///
/// This program is free software: you can redistribute it and/or modify
/// it under the terms of the GNU Affero General Public License as
/// published by the Free Software Foundation, either version 3 of the
/// License.
///
/// This program 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 Affero General Public License for more details.
///
/// $Id$
//////////////////////////////////////////////////////////////////////////////
///
/// @defgroup Codec The codec module.
///
/// This module contains all decoder and codec functions.
/// It is uses ffmpeg (http://ffmpeg.org) as backend.
///
/// It may work with libav (http://libav.org), but the tests show
/// many bugs and incompatiblity in it. Don't use this shit.
///
/// compile with passthrough support (stable, ac3 only)
#define USE_PASSTHROUGH
/// compile audio drift correction support (experimental)
#define USE_AUDIO_DRIFT_CORRECTION
/// compile AC3 audio drift correction support (experimental)
#define USE_AC3_DRIFT_CORRECTION
#include <stdio.h>
#include <unistd.h>
#ifdef __FreeBSD__
#include <sys/endian.h>
#else
#include <endian.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <libintl.h>
#define _(str) gettext(str) ///< gettext shortcut
#define _N(str) str ///< gettext_noop shortcut
#include <alsa/iatomic.h>
#include <libavcodec/avcodec.h>
#include <libavcodec/vaapi.h>
#ifdef USE_VDPAU
#include <libavcodec/vdpau.h>
#endif
#ifndef __USE_GNU
#define __USE_GNU
#endif
#include <pthread.h>
#ifdef MAIN_H
#include MAIN_H
#endif
#include "misc.h"
#include "video.h"
#include "audio.h"
#include "codec.h"
//----------------------------------------------------------------------------
// Global
//----------------------------------------------------------------------------
///
/// ffmpeg lock mutex
///
/// new ffmpeg dislikes simultanous open/close
/// this breaks our code, until this is fixed use lock.
///
static pthread_mutex_t CodecLockMutex;
//----------------------------------------------------------------------------
// Video
//----------------------------------------------------------------------------
#if 0
///
/// Video decoder typedef.
///
//typedef struct _video_decoder_ Decoder;
#endif
///
/// Video decoder structure.
///
struct _video_decoder_
{
VideoHwDecoder *HwDecoder; ///< video hardware decoder
int GetFormatDone; ///< flag get format called!
AVCodec *VideoCodec; ///< video codec
AVCodecContext *VideoCtx; ///< video codec context
AVFrame *Frame; ///< decoded video frame
};
//----------------------------------------------------------------------------
// Call-backs
//----------------------------------------------------------------------------
/**
** Callback to negotiate the PixelFormat.
**
** @param fmt is the list of formats which are supported by the codec,
** it is terminated by -1 as 0 is a valid format, the
** formats are ordered by quality.
*/
static enum PixelFormat Codec_get_format(AVCodecContext * video_ctx,
const enum PixelFormat *fmt)
{
VideoDecoder *decoder;
decoder = video_ctx->opaque;
//Debug(3, "codec: %s: %18p\n", __FUNCTION__, decoder);
decoder->GetFormatDone = 1;
return Video_get_format(decoder->HwDecoder, video_ctx, fmt);
}
/**
** Video buffer management, get buffer for frame.
**
** Called at the beginning of each frame to get a buffer for it.
**
** @param video_ctx Codec context
** @param frame Get buffer for this frame
*/
static int Codec_get_buffer(AVCodecContext * video_ctx, AVFrame * frame)
{
VideoDecoder *decoder;
decoder = video_ctx->opaque;
if (!decoder->GetFormatDone) { // get_format missing
enum PixelFormat fmts[2];
fprintf(stderr, "codec: buggy ffmpeg/libav\n");
Warning(_("codec: buggy ffmpeg/libav\n"));
fmts[0] = video_ctx->pix_fmt;
fmts[1] = PIX_FMT_NONE;
Codec_get_format(video_ctx, fmts);
}
#ifdef USE_VDPAU
// VDPAU: PIX_FMT_VDPAU_H264 .. PIX_FMT_VDPAU_VC1 PIX_FMT_VDPAU_MPEG4
if ((PIX_FMT_VDPAU_H264 <= video_ctx->pix_fmt
&& video_ctx->pix_fmt <= PIX_FMT_VDPAU_VC1)
|| video_ctx->pix_fmt == PIX_FMT_VDPAU_MPEG4) {
unsigned surface;
struct vdpau_render_state *vrs;
surface = VideoGetSurface(decoder->HwDecoder);
vrs = av_mallocz(sizeof(struct vdpau_render_state));
vrs->surface = surface;
//Debug(3, "codec: use surface %#010x\n", surface);
frame->type = FF_BUFFER_TYPE_USER;
#if LIBAVCODEC_VERSION_INT <= AV_VERSION_INT(53,46,0)
frame->age = 256 * 256 * 256 * 64;
#endif
// render
frame->data[0] = (void *)vrs;
frame->data[1] = NULL;
frame->data[2] = NULL;
frame->data[3] = NULL;
// reordered frames
if (video_ctx->pkt) {
frame->pkt_pts = video_ctx->pkt->pts;
} else {
frame->pkt_pts = AV_NOPTS_VALUE;
}
return 0;
}
#endif
// VA-API:
if (video_ctx->hwaccel_context) {
unsigned surface;
surface = VideoGetSurface(decoder->HwDecoder);
//Debug(3, "codec: use surface %#010x\n", surface);
frame->type = FF_BUFFER_TYPE_USER;
#if LIBAVCODEC_VERSION_INT <= AV_VERSION_INT(53,46,0)
frame->age = 256 * 256 * 256 * 64;
#endif
// vaapi needs both fields set
frame->data[0] = (void *)(size_t) surface;
frame->data[3] = (void *)(size_t) surface;
// reordered frames
if (video_ctx->pkt) {
frame->pkt_pts = video_ctx->pkt->pts;
} else {
frame->pkt_pts = AV_NOPTS_VALUE;
}
return 0;
}
//Debug(3, "codec: fallback to default get_buffer\n");
return avcodec_default_get_buffer(video_ctx, frame);
}
/**
** Video buffer management, release buffer for frame.
** Called to release buffers which were allocated with get_buffer.
**
** @param video_ctx Codec context
** @param frame Release buffer for this frame
*/
static void Codec_release_buffer(AVCodecContext * video_ctx, AVFrame * frame)
{
#ifdef USE_VDPAU
// VDPAU: PIX_FMT_VDPAU_H264 .. PIX_FMT_VDPAU_VC1 PIX_FMT_VDPAU_MPEG4
if ((PIX_FMT_VDPAU_H264 <= video_ctx->pix_fmt
&& video_ctx->pix_fmt <= PIX_FMT_VDPAU_VC1)
|| video_ctx->pix_fmt == PIX_FMT_VDPAU_MPEG4) {
VideoDecoder *decoder;
struct vdpau_render_state *vrs;
unsigned surface;
decoder = video_ctx->opaque;
vrs = (struct vdpau_render_state *)frame->data[0];
surface = vrs->surface;
//Debug(3, "codec: release surface %#010x\n", surface);
VideoReleaseSurface(decoder->HwDecoder, surface);
av_freep(&vrs->bitstream_buffers);
vrs->bitstream_buffers_allocated = 0;
av_freep(&frame->data[0]);
return;
}
#endif
// VA-API
if (video_ctx->hwaccel_context) {
VideoDecoder *decoder;
unsigned surface;
decoder = video_ctx->opaque;
surface = (unsigned)(size_t) frame->data[3];
//Debug(3, "codec: release surface %#010x\n", surface);
VideoReleaseSurface(decoder->HwDecoder, surface);
frame->data[0] = NULL;
frame->data[3] = NULL;
return;
}
//Debug(3, "codec: fallback to default release_buffer\n");
return avcodec_default_release_buffer(video_ctx, frame);
}
/// libav: compatibility hack
#ifndef AV_NUM_DATA_POINTERS
#define AV_NUM_DATA_POINTERS 4
#endif
/**
** Draw a horizontal band.
**
** @param video_ctx Codec context
** @param frame draw this frame
** @param y y position of slice
** @param type 1->top field, 2->bottom field, 3->frame
** @param offset offset into AVFrame.data from which slice
** should be read
** @param height height of slice
*/
static void Codec_draw_horiz_band(AVCodecContext * video_ctx,
const AVFrame * frame, __attribute__ ((unused))
int offset[AV_NUM_DATA_POINTERS], __attribute__ ((unused))
int y, __attribute__ ((unused))
int type, __attribute__ ((unused))
int height)
{
#ifdef USE_VDPAU
// VDPAU: PIX_FMT_VDPAU_H264 .. PIX_FMT_VDPAU_VC1 PIX_FMT_VDPAU_MPEG4
if ((PIX_FMT_VDPAU_H264 <= video_ctx->pix_fmt
&& video_ctx->pix_fmt <= PIX_FMT_VDPAU_VC1)
|| video_ctx->pix_fmt == PIX_FMT_VDPAU_MPEG4) {
VideoDecoder *decoder;
struct vdpau_render_state *vrs;
//unsigned surface;
decoder = video_ctx->opaque;
vrs = (struct vdpau_render_state *)frame->data[0];
//surface = vrs->surface;
//Debug(3, "codec: draw slice surface %#010x\n", surface);
//Debug(3, "codec: %d references\n", vrs->info.h264.num_ref_frames);
VideoDrawRenderState(decoder->HwDecoder, vrs);
return;
}
#else
(void)video_ctx;
(void)frame;
#endif
}
//----------------------------------------------------------------------------
// Test
//----------------------------------------------------------------------------
/**
** Allocate a new video decoder context.
**
** @param hw_decoder video hardware decoder
**
** @returns private decoder pointer for video decoder.
*/
VideoDecoder *CodecVideoNewDecoder(VideoHwDecoder * hw_decoder)
{
VideoDecoder *decoder;
if (!(decoder = calloc(1, sizeof(*decoder)))) {
Fatal(_("codec: can't allocate vodeo decoder\n"));
}
decoder->HwDecoder = hw_decoder;
return decoder;
}
/**
** Deallocate a video decoder context.
**
** @param decoder private video decoder
*/
void CodecVideoDelDecoder(VideoDecoder * decoder)
{
free(decoder);
}
/**
** Open video decoder.
**
** @param decoder private video decoder
** @param name video codec name
** @param codec_id video codec id, used if name == NULL
*/
void CodecVideoOpen(VideoDecoder * decoder, const char *name, int codec_id)
{
AVCodec *video_codec;
Debug(3, "codec: using video codec %s or ID %#06x\n", name, codec_id);
if (decoder->VideoCtx) {
Error(_("codec: missing close\n"));
}
if (name && (video_codec = avcodec_find_decoder_by_name(name))) {
Debug(3, "codec: vdpau decoder found\n");
} else if (!(video_codec = avcodec_find_decoder(codec_id))) {
Fatal(_("codec: codec ID %#06x not found\n"), codec_id);
// FIXME: none fatal
}
decoder->VideoCodec = video_codec;
if (!(decoder->VideoCtx = avcodec_alloc_context3(video_codec))) {
Fatal(_("codec: can't allocate video codec context\n"));
}
// FIXME: for software decoder use all cpus, otherwise 1
decoder->VideoCtx->thread_count = 1;
pthread_mutex_lock(&CodecLockMutex);
// open codec
#if LIBAVCODEC_VERSION_INT <= AV_VERSION_INT(53,5,0)
if (avcodec_open(decoder->VideoCtx, video_codec) < 0) {
pthread_mutex_unlock(&CodecLockMutex);
Fatal(_("codec: can't open video codec!\n"));
}
#else
if (video_codec->capabilities & (CODEC_CAP_HWACCEL_VDPAU |
CODEC_CAP_HWACCEL)) {
Debug(3, "codec: video mpeg hack active\n");
// HACK around badly placed checks in mpeg_mc_decode_init
// taken from mplayer vd_ffmpeg.c
decoder->VideoCtx->slice_flags =
SLICE_FLAG_CODED_ORDER | SLICE_FLAG_ALLOW_FIELD;
decoder->VideoCtx->thread_count = 1;
decoder->VideoCtx->active_thread_type = 0;
}
if (avcodec_open2(decoder->VideoCtx, video_codec, NULL) < 0) {
pthread_mutex_unlock(&CodecLockMutex);
Fatal(_("codec: can't open video codec!\n"));
}
#endif
pthread_mutex_unlock(&CodecLockMutex);
decoder->VideoCtx->opaque = decoder; // our structure
Debug(3, "codec: video '%s'\n", decoder->VideoCtx->codec_name);
if (codec_id == CODEC_ID_H264) {
// 2.53 Ghz CPU is too slow for this codec at 1080i
//decoder->VideoCtx->skip_loop_filter = AVDISCARD_ALL;
//decoder->VideoCtx->skip_loop_filter = AVDISCARD_BIDIR;
}
if (video_codec->capabilities & CODEC_CAP_TRUNCATED) {
Debug(3, "codec: video can use truncated packets\n");
// we send incomplete frames, for old PES recordings
decoder->VideoCtx->flags |= CODEC_FLAG_TRUNCATED;
}
// FIXME: own memory management for video frames.
if (video_codec->capabilities & CODEC_CAP_DR1) {
Debug(3, "codec: can use own buffer management\n");
}
if (video_codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
Debug(3, "codec: can export data for HW decoding (VDPAU)\n");
}
#ifdef CODEC_CAP_FRAME_THREADS
if (video_codec->capabilities & CODEC_CAP_FRAME_THREADS) {
Debug(3, "codec: codec supports frame threads\n");
}
#endif
//decoder->VideoCtx->debug = FF_DEBUG_STARTCODE;
//decoder->VideoCtx->err_recognition |= AV_EF_EXPLODE;
if (video_codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
// FIXME: get_format never called.
decoder->VideoCtx->get_format = Codec_get_format;
decoder->VideoCtx->get_buffer = Codec_get_buffer;
decoder->VideoCtx->release_buffer = Codec_release_buffer;
decoder->VideoCtx->reget_buffer = Codec_get_buffer;
decoder->VideoCtx->draw_horiz_band = Codec_draw_horiz_band;
decoder->VideoCtx->slice_flags =
SLICE_FLAG_CODED_ORDER | SLICE_FLAG_ALLOW_FIELD;
decoder->VideoCtx->thread_count = 1;
decoder->VideoCtx->active_thread_type = 0;
} else {
decoder->VideoCtx->get_format = Codec_get_format;
decoder->VideoCtx->hwaccel_context =
VideoGetVaapiContext(decoder->HwDecoder);
}
// our pixel format video hardware decoder hook
if (decoder->VideoCtx->hwaccel_context) {
decoder->VideoCtx->get_format = Codec_get_format;
decoder->VideoCtx->get_buffer = Codec_get_buffer;
decoder->VideoCtx->release_buffer = Codec_release_buffer;
decoder->VideoCtx->reget_buffer = Codec_get_buffer;
#if 0
decoder->VideoCtx->thread_count = 1;
decoder->VideoCtx->draw_horiz_band = NULL;
decoder->VideoCtx->slice_flags =
SLICE_FLAG_CODED_ORDER | SLICE_FLAG_ALLOW_FIELD;
//decoder->VideoCtx->flags |= CODEC_FLAG_EMU_EDGE;
#endif
}
//
// Prepare frame buffer for decoder
//
if (!(decoder->Frame = avcodec_alloc_frame())) {
Fatal(_("codec: can't allocate decoder frame\n"));
}
// reset buggy ffmpeg/libav flag
decoder->GetFormatDone = 0;
}
/**
** Close video decoder.
**
** @param video_decoder private video decoder
*/
void CodecVideoClose(VideoDecoder * video_decoder)
{
// FIXME: play buffered data
av_freep(&video_decoder->Frame);
if (video_decoder->VideoCtx) {
pthread_mutex_lock(&CodecLockMutex);
avcodec_close(video_decoder->VideoCtx);
pthread_mutex_unlock(&CodecLockMutex);
av_freep(&video_decoder->VideoCtx);
}
}
#if 0
/**
** Display pts...
**
** ffmpeg-0.9 pts always AV_NOPTS_VALUE
** ffmpeg-0.9 pkt_pts nice monotonic (only with HD)
** ffmpeg-0.9 pkt_dts wild jumping -160 - 340 ms
**
** libav 0.8_pre20111116 pts always AV_NOPTS_VALUE
** libav 0.8_pre20111116 pkt_pts always 0 (could be fixed?)
** libav 0.8_pre20111116 pkt_dts wild jumping -160 - 340 ms
*/
void DisplayPts(AVCodecContext * video_ctx, AVFrame * frame)
{
int ms_delay;
int64_t pts;
static int64_t last_pts;
pts = frame->pkt_pts;
if (pts == (int64_t) AV_NOPTS_VALUE) {
printf("*");
}
ms_delay = (1000 * video_ctx->time_base.num) / video_ctx->time_base.den;
ms_delay += frame->repeat_pict * ms_delay / 2;
printf("codec: PTS %s%s %" PRId64 " %d %d/%d %dms\n",
frame->repeat_pict ? "r" : " ", frame->interlaced_frame ? "I" : " ",
pts, (int)(pts - last_pts) / 90, video_ctx->time_base.num,
video_ctx->time_base.den, ms_delay);
if (pts != (int64_t) AV_NOPTS_VALUE) {
last_pts = pts;
}
}
#endif
/**
** Decode a video packet.
**
** @param decoder video decoder data
** @param avpkt video packet
*/
void CodecVideoDecode(VideoDecoder * decoder, const AVPacket * avpkt)
{
AVCodecContext *video_ctx;
AVFrame *frame;
int used;
int got_frame;
AVPacket pkt[1];
video_ctx = decoder->VideoCtx;
frame = decoder->Frame;
*pkt = *avpkt; // use copy
next_part:
// FIXME: this function can crash with bad packets
used = avcodec_decode_video2(video_ctx, frame, &got_frame, pkt);
Debug(4, "%s: %p %d -> %d %d\n", __FUNCTION__, pkt->data, pkt->size, used,
got_frame);
if (used < 0) {
Debug(3, "codec: bad video frame\n");
return;
}
if (got_frame) { // frame completed
//DisplayPts(video_ctx, frame);
VideoRenderFrame(decoder->HwDecoder, video_ctx, frame);
} else {
// some frames are needed for references, interlaced frames ...
// could happen with h264 dvb streams, just drop data.
Debug(4, "codec: %8d incomplete interlaced frame %d bytes used\n",
video_ctx->frame_number, used);
}
#if 1
// old code to support truncated or multi frame packets
if (used != pkt->size) {
// ffmpeg 0.8.7 dislikes our seq_end_h264 and enters endless loop here
if (used == 0 && pkt->size == 5 && pkt->data[4] == 0x0A) {
Warning("codec: ffmpeg 0.8.x workaround used\n");
return;
}
if (used >= 0 && used < pkt->size) {
// some tv channels, produce this
Debug(4,
"codec: ooops didn't use complete video packet used %d of %d\n",
used, pkt->size);
pkt->size -= used;
pkt->data += used;
// FIXME: align problem?
goto next_part;
}
}
#endif
}
/**
** Flush the video decoder.
**
** @param decoder video decoder data
*/
void CodecVideoFlushBuffers(VideoDecoder * decoder)
{
if (decoder->VideoCtx) {
avcodec_flush_buffers(decoder->VideoCtx);
}
}
//----------------------------------------------------------------------------
// Audio
//----------------------------------------------------------------------------
#if 0
///
/// Audio decoder typedef.
///
typedef struct _audio_decoder_ AudioDecoder;
#endif
///
/// Audio decoder structure.
///
struct _audio_decoder_
{
AVCodec *AudioCodec; ///< audio codec
AVCodecContext *AudioCtx; ///< audio codec context
int PassthroughAC3; ///< current ac-3 pass-through
int SampleRate; ///< current stream sample rate
int Channels; ///< current stream channels
int HwSampleRate; ///< hw sample rate
int HwChannels; ///< hw channels
ReSampleContext *ReSample; ///< audio resampling context
int64_t LastDelay; ///< last delay
struct timespec LastTime; ///< last time
int64_t LastPTS; ///< last PTS
int Drift; ///< accumulated audio drift
int DriftCorr; ///< audio drift correction value
int DriftFrac; ///< audio drift fraction for ac3
struct AVResampleContext *AvResample; ///< second audio resample context
#define MAX_CHANNELS 8 ///< max number of channels supported
int16_t *Buffer[MAX_CHANNELS]; ///< deinterleave sample buffers
int BufferSize; ///< size of sample buffer
int16_t *Remain[MAX_CHANNELS]; ///< filter remaining samples
int RemainSize; ///< size of remain buffer
int RemainCount; ///< number of remaining samples
};
#ifdef USE_AUDIO_DRIFT_CORRECTION
static char CodecAudioDrift; ///< flag: enable audio-drift correction
#else
static const int CodecAudioDrift = 0;
#endif
#ifdef USE_PASSTHROUGH
//static char CodecPassthroughPCM; ///< pass pcm through (unsupported)
static char CodecPassthroughAC3; ///< pass ac3 through
//static char CodecPassthroughDTS; ///< pass dts through (unsupported)
//static char CodecPassthroughMPA; ///< pass mpa through (unsupported)
#else
static const int CodecPassthroughAC3 = 0;
#endif
static char CodecDownmix; ///< enable ac-3 downmix
/**
** Allocate a new audio decoder context.
**
** @returns private decoder pointer for audio decoder.
*/
AudioDecoder *CodecAudioNewDecoder(void)
{
AudioDecoder *audio_decoder;
if (!(audio_decoder = calloc(1, sizeof(*audio_decoder)))) {
Fatal(_("codec: can't allocate audio decoder\n"));
}
return audio_decoder;
}
/**
** Deallocate an audio decoder context.
**
** @param decoder private audio decoder
*/
void CodecAudioDelDecoder(AudioDecoder * decoder)
{
free(decoder);
}
/**
** Open audio decoder.
**
** @param audio_decoder private audio decoder
** @param name audio codec name
** @param codec_id audio codec id, used if name == NULL
*/
void CodecAudioOpen(AudioDecoder * audio_decoder, const char *name,
int codec_id)
{
AVCodec *audio_codec;
Debug(3, "codec: using audio codec %s or ID %#06x\n", name, codec_id);
if (name && (audio_codec = avcodec_find_decoder_by_name(name))) {
Debug(3, "codec: audio decoder '%s' found\n", name);
} else if (!(audio_codec = avcodec_find_decoder(codec_id))) {
Fatal(_("codec: codec ID %#06x not found\n"), codec_id);
// FIXME: errors aren't fatal
}
audio_decoder->AudioCodec = audio_codec;
if (!(audio_decoder->AudioCtx = avcodec_alloc_context3(audio_codec))) {
Fatal(_("codec: can't allocate audio codec context\n"));
}
if (CodecDownmix) {
audio_decoder->AudioCtx->request_channels = 2;
audio_decoder->AudioCtx->request_channel_layout =
AV_CH_LAYOUT_STEREO_DOWNMIX;
}
pthread_mutex_lock(&CodecLockMutex);
// open codec
#if LIBAVCODEC_VERSION_INT <= AV_VERSION_INT(53,5,0)
if (avcodec_open(audio_decoder->AudioCtx, audio_codec) < 0) {
pthread_mutex_unlock(&CodecLockMutex);
Fatal(_("codec: can't open audio codec\n"));
}
#else
if (1) {
AVDictionary *av_dict;
av_dict = NULL;
// FIXME: import settings
//av_dict_set(&av_dict, "dmix_mode", "0", 0);
//av_dict_set(&av_dict, "ltrt_cmixlev", "1.414", 0);
//av_dict_set(&av_dict, "loro_cmixlev", "1.414", 0);
if (avcodec_open2(audio_decoder->AudioCtx, audio_codec, &av_dict) < 0) {
pthread_mutex_unlock(&CodecLockMutex);
Fatal(_("codec: can't open audio codec\n"));
}
av_dict_free(&av_dict);
}
#endif
pthread_mutex_unlock(&CodecLockMutex);
Debug(3, "codec: audio '%s'\n", audio_decoder->AudioCtx->codec_name);
if (audio_codec->capabilities & CODEC_CAP_TRUNCATED) {
Debug(3, "codec: audio can use truncated packets\n");
// we send only complete frames
// audio_decoder->AudioCtx->flags |= CODEC_FLAG_TRUNCATED;
}
audio_decoder->SampleRate = 0;
audio_decoder->Channels = 0;
audio_decoder->HwSampleRate = 0;
audio_decoder->HwChannels = 0;
audio_decoder->LastDelay = 0;
}
/**
** Close audio decoder.
**
** @param audio_decoder private audio decoder
*/
void CodecAudioClose(AudioDecoder * audio_decoder)
{
// FIXME: output any buffered data
if (audio_decoder->AvResample) {
int ch;
av_resample_close(audio_decoder->AvResample);
audio_decoder->AvResample = NULL;
audio_decoder->RemainCount = 0;
audio_decoder->BufferSize = 0;
audio_decoder->RemainSize = 0;
for (ch = 0; ch < MAX_CHANNELS; ++ch) {
free(audio_decoder->Buffer[ch]);
audio_decoder->Buffer[ch] = NULL;
free(audio_decoder->Remain[ch]);
audio_decoder->Remain[ch] = NULL;
}
}
if (audio_decoder->ReSample) {
audio_resample_close(audio_decoder->ReSample);
audio_decoder->ReSample = NULL;
}
if (audio_decoder->AudioCtx) {
pthread_mutex_lock(&CodecLockMutex);
avcodec_close(audio_decoder->AudioCtx);
pthread_mutex_unlock(&CodecLockMutex);
av_freep(&audio_decoder->AudioCtx);
}
}
/**
** Set audio drift correction.
**
** @param mask enable mask (PCM, AC3)
*/
void CodecSetAudioDrift(int mask)
{
#ifdef USE_AUDIO_DRIFT_CORRECTION
CodecAudioDrift = mask & 3;
#endif
(void)mask;
}
/**
** Set audio pass-through.
**
** @param mask enable mask (PCM, AC3)
*/
void CodecSetAudioPassthrough(int mask)
{
#ifdef USE_PASSTHROUGH
CodecPassthroughAC3 = mask & 1 ? 1 : 0;
#endif
(void)mask;
}
/**
** Set audio downmix.
**
** @param onoff enable/disable downmix.
*/
void CodecSetAudioDownmix(int onoff)
{
if (onoff == -1) {
CodecDownmix ^= 1;
return;
}
CodecDownmix = onoff;
}
/**
** Reorder audio frame.
**
** ffmpeg L R C Ls Rs -> alsa L R Ls Rs C
** ffmpeg L R C LFE Ls Rs -> alsa L R Ls Rs C LFE
** ffmpeg L R C LFE Ls Rs Rl Rr -> alsa L R Ls Rs C LFE Rl Rr
**
** @param buf[IN,OUT] sample buffer
** @param size size of sample buffer in bytes
** @param channels number of channels interleaved in sample buffer
*/
static void CodecReorderAudioFrame(int16_t * buf, int size, int channels)
{
int i;
int c;
int ls;
int rs;
int lfe;
switch (channels) {
case 5:
size /= 2;
for (i = 0; i < size; i += 5) {
c = buf[i + 2];
ls = buf[i + 3];
rs = buf[i + 4];
buf[i + 2] = ls;
buf[i + 3] = rs;
buf[i + 4] = c;
}
break;
case 6:
size /= 2;
for (i = 0; i < size; i += 6) {
c = buf[i + 2];
lfe = buf[i + 3];
ls = buf[i + 4];
rs = buf[i + 5];
buf[i + 2] = ls;
buf[i + 3] = rs;
buf[i + 4] = c;
buf[i + 5] = lfe;
}
break;
case 8:
size /= 2;
for (i = 0; i < size; i += 8) {
c = buf[i + 2];
lfe = buf[i + 3];
ls = buf[i + 4];
rs = buf[i + 5];
buf[i + 2] = ls;
buf[i + 3] = rs;
buf[i + 4] = c;
buf[i + 5] = lfe;
}
break;
}
}
/**
** Set/update audio pts clock.
**
** @param audio_decoder audio decoder data
** @param pts presentation timestamp
*/
static void CodecAudioSetClock(AudioDecoder * audio_decoder, int64_t pts)
{
struct timespec nowtime;
int64_t delay;
int64_t tim_diff;
int64_t pts_diff;
int drift;
int corr;
AudioSetClock(pts);
delay = AudioGetDelay();
if (!delay) {
return;
}
clock_gettime(CLOCK_REALTIME, &nowtime);
if (!audio_decoder->LastDelay) {
audio_decoder->LastTime = nowtime;
audio_decoder->LastPTS = pts;
audio_decoder->LastDelay = delay;
audio_decoder->Drift = 0;
audio_decoder->DriftFrac = 0;
Debug(3, "codec/audio: inital delay %" PRId64 "ms\n", delay / 90);
return;
}
// collect over some time
pts_diff = pts - audio_decoder->LastPTS;
if (pts_diff < 10 * 1000 * 90) {
return;
}
tim_diff = (nowtime.tv_sec - audio_decoder->LastTime.tv_sec)
* 1000 * 1000 * 1000 + (nowtime.tv_nsec -
audio_decoder->LastTime.tv_nsec);
drift =
(tim_diff * 90) / (1000 * 1000) - pts_diff + delay -
audio_decoder->LastDelay;
// adjust rounding error
nowtime.tv_nsec -= nowtime.tv_nsec % (1000 * 1000 / 90);
audio_decoder->LastTime = nowtime;
audio_decoder->LastPTS = pts;
audio_decoder->LastDelay = delay;
if (0) {
Debug(3,
"codec/audio: interval P:%5" PRId64 "ms T:%5" PRId64 "ms D:%4"
PRId64 "ms %f %d\n", pts_diff / 90, tim_diff / (1000 * 1000),
delay / 90, drift / 90.0, audio_decoder->DriftCorr);
}
// underruns and av_resample have the same time :(((
if (abs(drift) > 10 * 90) {
// drift too big, pts changed?
Debug(3, "codec/audio: drift(%6d) %3dms reset\n",
audio_decoder->DriftCorr, drift / 90);
audio_decoder->LastDelay = 0;
#ifdef DEBUG
corr = 0; // keep gcc happy
#endif
} else {
drift += audio_decoder->Drift;
audio_decoder->Drift = drift;
corr = (10 * audio_decoder->HwSampleRate * drift) / (90 * 1000);
// SPDIF/HDMI passthrough
if ((CodecAudioDrift & 2) && (!CodecPassthroughAC3
|| audio_decoder->AudioCtx->codec_id != CODEC_ID_AC3)) {
audio_decoder->DriftCorr = -corr;
}
if (audio_decoder->DriftCorr < -20000) { // limit correction
audio_decoder->DriftCorr = -20000;
} else if (audio_decoder->DriftCorr > 20000) {
audio_decoder->DriftCorr = 20000;
}
}
// FIXME: this works with libav 0.8, and only with >10ms with ffmpeg 0.10
if (audio_decoder->AvResample && audio_decoder->DriftCorr) {
int distance;
// try workaround for buggy ffmpeg 0.10
if (abs(audio_decoder->DriftCorr) < 2000) {
distance = (pts_diff * audio_decoder->HwSampleRate) / (900 * 1000);
} else {
distance = (pts_diff * audio_decoder->HwSampleRate) / (90 * 1000);
}
av_resample_compensate(audio_decoder->AvResample,
audio_decoder->DriftCorr / 10, distance);
}
if (1) {
static int c;
if (!(c++ % 10)) {
Debug(3, "codec/audio: drift(%6d) %8dus %5d\n",
audio_decoder->DriftCorr, drift * 1000 / 90, corr);
}
}
}
/**
** Handle audio format changes.
**
** @param audio_decoder audio decoder data
*/
static void CodecAudioUpdateFormat(AudioDecoder * audio_decoder)
{
const AVCodecContext *audio_ctx;
int err;
int isAC3;
// FIXME: use swr_convert from swresample (only in ffmpeg!)
if (audio_decoder->ReSample) {
audio_resample_close(audio_decoder->ReSample);
audio_decoder->ReSample = NULL;
}
if (audio_decoder->AvResample) {
av_resample_close(audio_decoder->AvResample);
audio_decoder->AvResample = NULL;
audio_decoder->RemainCount = 0;
}
audio_ctx = audio_decoder->AudioCtx;
Debug(3, "codec/audio: format change %dHz %d channels %s\n",
audio_ctx->sample_rate, audio_ctx->channels,
CodecPassthroughAC3 ? "pass-through" : "");
audio_decoder->SampleRate = audio_ctx->sample_rate;
audio_decoder->HwSampleRate = audio_ctx->sample_rate;
audio_decoder->Channels = audio_ctx->channels;
audio_decoder->PassthroughAC3 = CodecPassthroughAC3;
// SPDIF/HDMI passthrough
if (CodecPassthroughAC3 && audio_ctx->codec_id == CODEC_ID_AC3) {
audio_decoder->HwChannels = 2;
isAC3 = 1;
} else {
audio_decoder->HwChannels = audio_ctx->channels;
isAC3 = 0;
}
// channels not support?
if ((err =
AudioSetup(&audio_decoder->HwSampleRate,
&audio_decoder->HwChannels, isAC3))) {
Debug(3, "codec/audio: resample %dHz *%d -> %dHz *%d\n",
audio_ctx->sample_rate, audio_ctx->channels,
audio_decoder->HwSampleRate, audio_decoder->HwChannels);
if (err == 1) {
audio_decoder->ReSample =
av_audio_resample_init(audio_decoder->HwChannels,
audio_ctx->channels, audio_decoder->HwSampleRate,
audio_ctx->sample_rate, audio_ctx->sample_fmt,
audio_ctx->sample_fmt, 16, 10, 0, 0.8);
// libav-0.8_pre didn't support 6 -> 2 channels
if (!audio_decoder->ReSample) {
Error(_("codec/audio: resample setup error\n"));
audio_decoder->HwChannels = 0;
audio_decoder->HwSampleRate = 0;
return;
}
} else {
Debug(3, "codec/audio: audio setup error\n");
// FIXME: handle errors
audio_decoder->HwChannels = 0;
audio_decoder->HwSampleRate = 0;
return;
}
}
// prepare audio drift resample
#ifdef USE_AUDIO_DRIFT_CORRECTION
if ((CodecAudioDrift & 1) && !isAC3) {
if (audio_decoder->AvResample) {
Error(_("codec/audio: overwrite resample\n"));
}
audio_decoder->AvResample =
av_resample_init(audio_decoder->HwSampleRate,
audio_decoder->HwSampleRate, 16, 10, 0, 0.8);
if (!audio_decoder->AvResample) {
Error(_("codec/audio: AvResample setup error\n"));
} else {
// reset drift to some default value
audio_decoder->DriftCorr /= 2;
audio_decoder->DriftFrac = 0;
av_resample_compensate(audio_decoder->AvResample,
audio_decoder->DriftCorr / 10,
10 * audio_decoder->HwSampleRate);
}
}
#endif
}
/**
** Codec enqueue audio samples.
**
** @param audio_decoder audio decoder data
** @param data samples data
** @param count number of bytes in sample data
*/
void CodecAudioEnqueue(AudioDecoder * audio_decoder, int16_t * data, int count)
{
#ifdef USE_AUDIO_DRIFT_CORRECTION
if ((CodecAudioDrift & 1) && audio_decoder->AvResample) {
int16_t buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 4 +
FF_INPUT_BUFFER_PADDING_SIZE] __attribute__ ((aligned(16)));
int16_t buftmp[MAX_CHANNELS][(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 4];
int consumed;
int i;
int n;
int ch;
int bytes_n;
bytes_n = count / audio_decoder->HwChannels;
// resize sample buffer, if needed
if (audio_decoder->RemainCount + bytes_n > audio_decoder->BufferSize) {
audio_decoder->BufferSize = audio_decoder->RemainCount + bytes_n;
for (ch = 0; ch < MAX_CHANNELS; ++ch) {
audio_decoder->Buffer[ch] =
realloc(audio_decoder->Buffer[ch],
audio_decoder->BufferSize);
}
}
// copy remaining bytes into sample buffer
for (ch = 0; ch < audio_decoder->HwChannels; ++ch) {
memcpy(audio_decoder->Buffer[ch], audio_decoder->Remain[ch],
audio_decoder->RemainCount);
}
// deinterleave samples into sample buffer
for (i = 0; i < bytes_n / 2; i++) {
for (ch = 0; ch < audio_decoder->HwChannels; ++ch) {
audio_decoder->Buffer[ch][audio_decoder->RemainCount / 2 + i]
= data[i * audio_decoder->HwChannels + ch];
}
}
bytes_n += audio_decoder->RemainSize;
n = 0; // keep gcc lucky
// resample the sample buffer into tmp buffer
for (ch = 0; ch < audio_decoder->HwChannels; ++ch) {
n = av_resample(audio_decoder->AvResample, buftmp[ch],
audio_decoder->Buffer[ch], &consumed, bytes_n / 2,
sizeof(buftmp[ch]) / 2, ch == audio_decoder->HwChannels - 1);
// fixme remaining channels
if (bytes_n - consumed * 2 > audio_decoder->RemainSize) {
audio_decoder->RemainSize = bytes_n - consumed * 2;
}
audio_decoder->Remain[ch] =
realloc(audio_decoder->Remain[ch], audio_decoder->RemainSize);
memcpy(audio_decoder->Remain[ch],
audio_decoder->Buffer[ch] + consumed,
audio_decoder->RemainSize);
audio_decoder->RemainCount = audio_decoder->RemainSize;
}
// interleave samples from sample buffer
for (i = 0; i < n; i++) {
for (ch = 0; ch < audio_decoder->HwChannels; ++ch) {
buf[i * audio_decoder->HwChannels + ch] = buftmp[ch][i];
}
}
n *= 2;
n *= audio_decoder->HwChannels;
CodecReorderAudioFrame(buf, n, audio_decoder->HwChannels);
AudioEnqueue(buf, n);
return;
}
#endif
CodecReorderAudioFrame(data, count, audio_decoder->HwChannels);
AudioEnqueue(data, count);
}
/**
** Decode an audio packet.
**
** PTS must be handled self.
**
** @param audio_decoder audio decoder data
** @param avpkt audio packet
*/
void CodecAudioDecode(AudioDecoder * audio_decoder, const AVPacket * avpkt)
{
int16_t buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 4 +
FF_INPUT_BUFFER_PADDING_SIZE] __attribute__ ((aligned(16)));
int buf_sz;
int l;
AVCodecContext *audio_ctx;
audio_ctx = audio_decoder->AudioCtx;
buf_sz = sizeof(buf);
l = avcodec_decode_audio3(audio_ctx, buf, &buf_sz, (AVPacket *) avpkt);
if (avpkt->size != l) {
if (l == AVERROR(EAGAIN)) {
Error(_("codec: latm\n"));
return;
}
if (l < 0) { // no audio frame could be decompressed
Error(_("codec: error audio data\n"));
return;
}
Error(_("codec: error more than one frame data\n"));
}
#ifdef notyetFF_API_OLD_DECODE_AUDIO
// FIXME: ffmpeg git comeing
int got_frame;
avcodec_decode_audio4(audio_ctx, frame, &got_frame, avpkt);
#else
#endif
// update audio clock
if (avpkt->pts != (int64_t) AV_NOPTS_VALUE) {
CodecAudioSetClock(audio_decoder, avpkt->pts);
}
// FIXME: must first play remainings bytes, than change and play new.
if (audio_decoder->PassthroughAC3 != CodecPassthroughAC3
|| audio_decoder->SampleRate != audio_ctx->sample_rate
|| audio_decoder->Channels != audio_ctx->channels) {
CodecAudioUpdateFormat(audio_decoder);
}
if (audio_decoder->HwSampleRate && audio_decoder->HwChannels) {
// need to resample audio
if (audio_decoder->ReSample) {
int16_t outbuf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 4 +
FF_INPUT_BUFFER_PADDING_SIZE]
__attribute__ ((aligned(16)));
int outlen;
// FIXME: libav-0.7.2 crash here
outlen =
audio_resample(audio_decoder->ReSample, outbuf, buf, buf_sz);
#ifdef DEBUG
if (outlen != buf_sz) {
Debug(3, "codec/audio: possible fixed ffmpeg\n");
}
#endif
if (outlen) {
// outlen seems to be wrong in ffmpeg-0.9
outlen /= audio_decoder->Channels *
av_get_bytes_per_sample(audio_ctx->sample_fmt);
outlen *=
audio_decoder->HwChannels *
av_get_bytes_per_sample(audio_ctx->sample_fmt);
Debug(4, "codec/audio: %d -> %d\n", buf_sz, outlen);
CodecAudioEnqueue(audio_decoder, outbuf, outlen);
}
} else {
#ifdef USE_PASSTHROUGH
// SPDIF/HDMI passthrough
if (CodecPassthroughAC3 && audio_ctx->codec_id == CODEC_ID_AC3) {
// build SPDIF header and append A52 audio to it
// avpkt is the original data
buf_sz = 6144;
#ifdef USE_AC3_DRIFT_CORRECTION
if (CodecAudioDrift & 2) {
int x;
x = (audio_decoder->DriftFrac +
(audio_decoder->DriftCorr * buf_sz)) / (10 *
audio_decoder->HwSampleRate * 100);
audio_decoder->DriftFrac =
(audio_decoder->DriftFrac +
(audio_decoder->DriftCorr * buf_sz)) % (10 *
audio_decoder->HwSampleRate * 100);
x *= audio_decoder->HwChannels * 4;
if (x < -64) { // limit correction
x = -64;
} else if (x > 64) {
x = 64;
}
buf_sz += x;
}
#endif
if (buf_sz < avpkt->size + 8) {
Error(_
("codec/audio: decoded data smaller than encoded\n"));
return;
}
// copy original data for output
// FIXME: not 100% sure, if endian is correct
buf[0] = htole16(0xF872); // iec 61937 sync word
buf[1] = htole16(0x4E1F);
buf[2] = htole16(0x01 | (avpkt->data[5] & 0x07) << 8);
buf[3] = htole16(avpkt->size * 8);
swab(avpkt->data, buf + 4, avpkt->size);
memset(buf + 4 + avpkt->size / 2, 0, buf_sz - 8 - avpkt->size);
// don't play with the ac-3 samples
AudioEnqueue(buf, buf_sz);
return;
}
#if 0
//
// old experimental code
//
if (1) {
// FIXME: need to detect dts
// copy original data for output
// FIXME: buf is sint
buf[0] = 0x72;
buf[1] = 0xF8;
buf[2] = 0x1F;
buf[3] = 0x4E;
buf[4] = 0x00;
switch (avpkt->size) {
case 512:
buf[5] = 0x0B;
break;
case 1024:
buf[5] = 0x0C;
break;
case 2048:
buf[5] = 0x0D;
break;
default:
Debug(3,
"codec/audio: dts sample burst not supported\n");
buf[5] = 0x00;
break;
}
buf[6] = (avpkt->size * 8);
buf[7] = (avpkt->size * 8) >> 8;
//buf[8] = 0x0B;
//buf[9] = 0x77;
//printf("%x %x\n", avpkt->data[0],avpkt->data[1]);
// swab?
memcpy(buf + 8, avpkt->data, avpkt->size);
memset(buf + 8 + avpkt->size, 0, buf_sz - 8 - avpkt->size);
} else if (1) {
// FIXME: need to detect mp2
// FIXME: mp2 passthrough
// see softhddev.c version/layer
// 0x04 mpeg1 layer1
// 0x05 mpeg1 layer23
// 0x06 mpeg2 ext
// 0x07 mpeg2.5 layer 1
// 0x08 mpeg2.5 layer 2
// 0x09 mpeg2.5 layer 3
}
// DTS HD?
// True HD?
#endif
#endif
CodecAudioEnqueue(audio_decoder, buf, buf_sz);
}
}
}
/**
** Flush the audio decoder.
**
** @param decoder audio decoder data
*/
void CodecAudioFlushBuffers(AudioDecoder * decoder)
{
avcodec_flush_buffers(decoder->AudioCtx);
}
//----------------------------------------------------------------------------
// Codec
//----------------------------------------------------------------------------
/**
** Empty log callback
*/
static void CodecNoopCallback( __attribute__ ((unused))
void *ptr, __attribute__ ((unused))
int level, __attribute__ ((unused))
const char *fmt, __attribute__ ((unused)) va_list vl)
{
}
/**
** Codec init
*/
void CodecInit(void)
{
pthread_mutex_init(&CodecLockMutex, NULL);
#ifndef DEBUG
// disable display ffmpeg error messages
av_log_set_callback(CodecNoopCallback);
#else
(void)CodecNoopCallback;
#endif
avcodec_register_all(); // register all formats and codecs
}
/**
** Codec exit.
*/
void CodecExit(void)
{
pthread_mutex_destroy(&CodecLockMutex);
}
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