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ffplay.c
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ffplay.c
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/*
* Copyright (c) 2003 Fabrice Bellard
*
* 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
*/
/**
* @file
* simple media player based on the FFmpeg libraries
*/
#include "config.h"
#include "config_components.h"
#include <inttypes.h>
#include <math.h>
#include <limits.h>
#include <signal.h>
#include <stdint.h>
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/dict.h"
#include "libavutil/fifo.h"
#include "libavutil/parseutils.h"
#include "libavutil/samplefmt.h"
#include "libavutil/time.h"
#include "libavutil/bprint.h"
#include "libavformat/avformat.h"
#include "libavdevice/avdevice.h"
#include "libswscale/swscale.h"
#include "libavutil/opt.h"
#include "libavcodec/avfft.h"
#include "libswresample/swresample.h"
#include "libavfilter/avfilter.h"
#include "libavfilter/buffersink.h"
#include "libavfilter/buffersrc.h"
#include <SDL.h>
#include <SDL_thread.h>
#include "cmdutils.h"
#include "opt_common.h"
const char program_name[] = "ffplay";
const int program_birth_year = 2003;
#define MAX_QUEUE_SIZE (15 * 1024 * 1024)
#define MIN_FRAMES 25
#define EXTERNAL_CLOCK_MIN_FRAMES 2
#define EXTERNAL_CLOCK_MAX_FRAMES 10
/* Minimum SDL audio buffer size, in samples. */
#define SDL_AUDIO_MIN_BUFFER_SIZE 512
/* Calculate actual buffer size keeping in mind not cause too frequent audio callbacks */
#define SDL_AUDIO_MAX_CALLBACKS_PER_SEC 30
/* Step size for volume control in dB */
#define SDL_VOLUME_STEP (0.75)
/* no AV sync correction is done if below the minimum AV sync threshold */
#define AV_SYNC_THRESHOLD_MIN 0.04
/* AV sync correction is done if above the maximum AV sync threshold */
#define AV_SYNC_THRESHOLD_MAX 0.1
/* If a frame duration is longer than this, it will not be duplicated to compensate AV sync */
#define AV_SYNC_FRAMEDUP_THRESHOLD 0.1
/* no AV correction is done if too big error */
#define AV_NOSYNC_THRESHOLD 10.0
/* maximum audio speed change to get correct sync */
#define SAMPLE_CORRECTION_PERCENT_MAX 10
/* external clock speed adjustment constants for realtime sources based on buffer fullness */
#define EXTERNAL_CLOCK_SPEED_MIN 0.900
#define EXTERNAL_CLOCK_SPEED_MAX 1.010
#define EXTERNAL_CLOCK_SPEED_STEP 0.001
/* we use about AUDIO_DIFF_AVG_NB A-V differences to make the average */
#define AUDIO_DIFF_AVG_NB 20
/* polls for possible required screen refresh at least this often, should be less than 1/fps */
#define REFRESH_RATE 0.01
/* NOTE: the size must be big enough to compensate the hardware audio buffersize size */
/* TODO: We assume that a decoded and resampled frame fits into this buffer */
#define SAMPLE_ARRAY_SIZE (8 * 65536)
#define CURSOR_HIDE_DELAY 1000000
#define USE_ONEPASS_SUBTITLE_RENDER 1
typedef struct MyAVPacketList
{
/* 待解码数据 */
AVPacket *pkt;
/* pkt序列号 */
int serial;
} MyAVPacketList;
typedef struct PacketQueue
{
/* ffmpeg封装的队列数据结构，里面的数据对象是MyAVPacketList */
/* 支持操作alloc2, write, read, freep */
AVFifo *pkt_list;
/* 队列中当前的packet数 */
int nb_packets;
/* 队列所有节点占用的总内存大小 */
int size;
/* 队列中所有节点的合计时长 */
int64_t duration;
/* 终止队列操作信号，用于安全快速退出播放 */
int abort_request;
/* 序列号，和MyAVPacketList中的序列号作用相同，但改变的时序略有不同 */
int serial;
/* 互斥锁，用于保护队列操作 */
SDL_mutex *mutex;
/* 条件变量，用于读写进程的相互通知 */
SDL_cond *cond;
} PacketQueue;
#define VIDEO_PICTURE_QUEUE_SIZE 3
#define SUBPICTURE_QUEUE_SIZE 16
#define SAMPLE_QUEUE_SIZE 9
#define FRAME_QUEUE_SIZE FFMAX(SAMPLE_QUEUE_SIZE, FFMAX(VIDEO_PICTURE_QUEUE_SIZE, SUBPICTURE_QUEUE_SIZE))
typedef struct AudioParams
{
int freq;
AVChannelLayout ch_layout;
enum AVSampleFormat fmt;
int frame_size;
int bytes_per_sec;
} AudioParams;
typedef struct Clock
{
double pts; /* clock base */
double pts_drift; /* clock base minus time at which we updated the clock */
double last_updated;
double speed;
int serial; /* clock is based on a packet with this serial */
int paused;
int *queue_serial; /* pointer to the current packet queue serial, used for obsolete clock detection */
} Clock;
typedef struct FrameData
{
int64_t pkt_pos;
} FrameData;
/* Common struct for handling all types of decoded data and allocated render buffers. */
typedef struct Frame
{
AVFrame *frame;
AVSubtitle sub;
int serial;
double pts; /* presentation timestamp for the frame */
double duration; /* estimated duration of the frame */
int64_t pos; /* byte position of the frame in the input file */
int width;
int height;
int format;
AVRational sar;
int uploaded;
int flip_v;
} Frame;
typedef struct FrameQueue
{
Frame queue[FRAME_QUEUE_SIZE]; /* 用于存放帧数据的队列 */
int rindex; /* 读索引 */
int windex; /* 写索引 */
int size; /* 队列中的帧数 */
int max_size; /* 队列最大缓存的帧数 */
int keep_last; /* 播放后是否在队列中保留上一帧不销毁 */
int rindex_shown; /* keep_last的实现，读的时候实际上读的是rindex + rindex_shown，分析见下 */
SDL_mutex *mutex; /* 互斥锁，用于保护队列操作 */
SDL_cond *cond; /* 条件变量，用于解码和播放线程的相互通知 */
PacketQueue *pktq; /* 指向对应的PacketQueue，FrameQueue里面的数据就是这个队列解码出来的 */
} FrameQueue;
enum
{
AV_SYNC_AUDIO_MASTER, /* default choice */
AV_SYNC_VIDEO_MASTER,
AV_SYNC_EXTERNAL_CLOCK, /* synchronize to an external clock */
};
typedef struct Decoder
{
AVPacket *pkt;
PacketQueue *queue;
AVCodecContext *avctx;
int pkt_serial;
int finished;
int packet_pending;
SDL_cond *empty_queue_cond;
int64_t start_pts;
AVRational start_pts_tb;
int64_t next_pts;
AVRational next_pts_tb;
SDL_Thread *decoder_tid;
} Decoder;
typedef struct VideoState
{
SDL_Thread *read_tid; /* 读线程 */
const AVInputFormat *iformat; /* 输入文件格式 */
int abort_request; /* =1时请求退出播放 */
int force_refresh; /* =1时请求立即刷新画面 */
int paused; /* =1时请求暂停播放，=0时播放 */
int last_paused; /* 暂存“暂停”和“播放”状态 */
int queue_attachments_req; /* =1时请求读取附加数据 */
int seek_req; /* =1时请求seek */
int seek_flags; /* seek标志 */
int64_t seek_pos; /* 本次seek的目标位置（当前位置+增量） */
int64_t seek_rel; /* 本次seek的位置增量 */
int read_pause_return; /* 读线程暂停后的返回值 */
AVFormatContext *ic; /* iformat上下文 */
int realtime; /* =1为实时播放 */
Clock audclk; /* 音频时钟 */
Clock vidclk; /* 视频时钟 */
Clock extclk; /* 外部时钟 */
FrameQueue pictq; /* 视频帧队列 */
FrameQueue subpq; /* 字幕帧队列 */
FrameQueue sampq; /* 音频帧队列 */
Decoder auddec; /* 音频解码器 */
Decoder viddec; /* 视频解码器 */
Decoder subdec; /* 字幕解码器 */
int audio_stream; /* 音频流索引 */
int av_sync_type; /* 音视频同步类型（默认同步到音频时钟，即audio master） */
double audio_clock; /* 音频播放时钟（当前帧pts+duration） */
int audio_clock_serial; /* 播放序列号，可被seek设置 */
/* 下面4个参数在非audio master同步时使用 */
double audio_diff_cum; /* used for AV difference average computation */
double audio_diff_avg_coef;
double audio_diff_threshold;
int audio_diff_avg_count;
AVStream *audio_st; /* 音频流 */
PacketQueue audioq; /* 音频包队列 */
int audio_hw_buf_size; /* SDL音频缓冲区大小（单位B) */
uint8_t *audio_buf; /* 指向待播放的一帧音频数据，在audio_decode_frame中被设置，如果重采样则指向重采样得到的音频数据，否则指向frame中的数据 */
uint8_t *audio_buf1; /* 指向重采样得到的音频数据 */
unsigned int audio_buf_size; /* audio_buf指向缓冲区大小（单位B) */
unsigned int audio_buf1_size; /* audio_buf1指向缓冲区大小（单位B) */
int audio_buf_index; /* 当前audio_buf中待拷贝数据的第一个字节的索引 */
int audio_write_buf_size; /* is->audio_buf_size - is->audio_buf_index，待拷贝字节数 */
int audio_volume; /* 音量 */
int muted; /* =1时静音 */
struct AudioParams audio_src; /* 音频源参数 */
struct AudioParams audio_filter_src; /* 音频滤波器源参数 */
struct AudioParams audio_tgt; /* 音频目标参数 */
struct SwrContext *swr_ctx; /* 重采样上下文 */
int frame_drops_early; /* 丢弃的packet数 */
int frame_drops_late; /* 丢弃的frame数 */
/* 显示模式（视频、波形...） */
enum ShowMode
{
SHOW_MODE_NONE = -1,
SHOW_MODE_VIDEO = 0,
SHOW_MODE_WAVES,
SHOW_MODE_RDFT,
SHOW_MODE_NB
} show_mode;
int16_t sample_array[SAMPLE_ARRAY_SIZE];
int sample_array_index;
int last_i_start;
RDFTContext *rdft;
int rdft_bits;
FFTSample *rdft_data;
int xpos;
double last_vis_time;
SDL_Texture *vis_texture; /* 视频纹理 */
SDL_Texture *sub_texture; /* 字幕纹理 */
SDL_Texture *vid_texture; /* 视频纹理 */
int subtitle_stream; /* 字幕流索引 */
AVStream *subtitle_st; /* 字幕流 */
PacketQueue subtitleq; /* 字幕包队列 */
double frame_timer; /* 最后一帧播放的时刻 */
double frame_last_returned_time; /* 最后一帧返回的时刻 */
double frame_last_filter_delay; /* 最后一帧滤波延迟 */
int video_stream; /* 视频流索引 */
AVStream *video_st; /* 视频流 */
PacketQueue videoq; /* 视频包队列 */
double max_frame_duration; // maximum duration of a frame - above this, we consider the jump a timestamp discontinuity
struct SwsContext *sub_convert_ctx; /* 字幕转换上下文 */
int eof;
char *filename;
int width, height, xleft, ytop;
int step;
int vfilter_idx;
AVFilterContext *in_video_filter; // the first filter in the video chain
AVFilterContext *out_video_filter; // the last filter in the video chain
AVFilterContext *in_audio_filter; // the first filter in the audio chain
AVFilterContext *out_audio_filter; // the last filter in the audio chain
AVFilterGraph *agraph; // audio filter graph
int last_video_stream, last_audio_stream, last_subtitle_stream; /* 最近的相关流索引 */
SDL_cond *continue_read_thread; /* 当读取数据队列满了后进入休眠时，可以通过该condition唤醒该读线程 */
} VideoState;
/* options specified by the user */
static const AVInputFormat *file_iformat;
static const char *input_filename;
static const char *window_title;
static int default_width = 640;
static int default_height = 480;
static int screen_width = 0;
static int screen_height = 0;
static int screen_left = SDL_WINDOWPOS_CENTERED;
static int screen_top = SDL_WINDOWPOS_CENTERED;
static int audio_disable;
static int video_disable;
static int subtitle_disable;
static const char *wanted_stream_spec[AVMEDIA_TYPE_NB] = {0};
static int seek_by_bytes = -1;
static float seek_interval = 10;
static int display_disable;
static int borderless;
static int alwaysontop;
static int startup_volume = 100;
static int show_status = -1;
static int av_sync_type = AV_SYNC_AUDIO_MASTER;
static int64_t start_time = AV_NOPTS_VALUE;
static int64_t duration = AV_NOPTS_VALUE;
static int fast = 0;
static int genpts = 0;
static int lowres = 0;
static int decoder_reorder_pts = -1;
static int autoexit;
static int exit_on_keydown;
static int exit_on_mousedown;
static int loop = 1;
static int framedrop = -1;
static int infinite_buffer = -1;
static enum ShowMode show_mode = SHOW_MODE_NONE;
static const char *audio_codec_name;
static const char *subtitle_codec_name;
static const char *video_codec_name;
double rdftspeed = 0.02;
static int64_t cursor_last_shown;
static int cursor_hidden = 0;
static const char **vfilters_list = NULL;
static int nb_vfilters = 0;
static char *afilters = NULL;
static int autorotate = 1;
static int find_stream_info = 1;
static int filter_nbthreads = 0;
/* current context */
static int is_full_screen;
static int64_t audio_callback_time;
#define FF_QUIT_EVENT (SDL_USEREVENT + 2)
static SDL_Window *window;
static SDL_Renderer *renderer;
static SDL_RendererInfo renderer_info = {0};
static SDL_AudioDeviceID audio_dev;
static const struct TextureFormatEntry
{
enum AVPixelFormat format;
int texture_fmt;
} sdl_texture_format_map[] = {
{AV_PIX_FMT_RGB8, SDL_PIXELFORMAT_RGB332},
{AV_PIX_FMT_RGB444, SDL_PIXELFORMAT_RGB444},
{AV_PIX_FMT_RGB555, SDL_PIXELFORMAT_RGB555},
{AV_PIX_FMT_BGR555, SDL_PIXELFORMAT_BGR555},
{AV_PIX_FMT_RGB565, SDL_PIXELFORMAT_RGB565},
{AV_PIX_FMT_BGR565, SDL_PIXELFORMAT_BGR565},
{AV_PIX_FMT_RGB24, SDL_PIXELFORMAT_RGB24},
{AV_PIX_FMT_BGR24, SDL_PIXELFORMAT_BGR24},
{AV_PIX_FMT_0RGB32, SDL_PIXELFORMAT_RGB888},
{AV_PIX_FMT_0BGR32, SDL_PIXELFORMAT_BGR888},
{AV_PIX_FMT_NE(RGB0, 0BGR), SDL_PIXELFORMAT_RGBX8888},
{AV_PIX_FMT_NE(BGR0, 0RGB), SDL_PIXELFORMAT_BGRX8888},
{AV_PIX_FMT_RGB32, SDL_PIXELFORMAT_ARGB8888},
{AV_PIX_FMT_RGB32_1, SDL_PIXELFORMAT_RGBA8888},
{AV_PIX_FMT_BGR32, SDL_PIXELFORMAT_ABGR8888},
{AV_PIX_FMT_BGR32_1, SDL_PIXELFORMAT_BGRA8888},
{AV_PIX_FMT_YUV420P, SDL_PIXELFORMAT_IYUV},
{AV_PIX_FMT_YUYV422, SDL_PIXELFORMAT_YUY2},
{AV_PIX_FMT_UYVY422, SDL_PIXELFORMAT_UYVY},
{AV_PIX_FMT_NONE, SDL_PIXELFORMAT_UNKNOWN},
};
static int opt_add_vfilter(void *optctx, const char *opt, const char *arg)
{
GROW_ARRAY(vfilters_list, nb_vfilters);
vfilters_list[nb_vfilters - 1] = arg;
return 0;
}
static inline int cmp_audio_fmts(enum AVSampleFormat fmt1, int64_t channel_count1,
enum AVSampleFormat fmt2, int64_t channel_count2)
{
/* If channel count == 1, planar and non-planar formats are the same */
if (channel_count1 == 1 && channel_count2 == 1)
return av_get_packed_sample_fmt(fmt1) != av_get_packed_sample_fmt(fmt2);
else
return channel_count1 != channel_count2 || fmt1 != fmt2;
}
static int packet_queue_put_private(PacketQueue *q, AVPacket *pkt)
{
MyAVPacketList pkt1;
int ret;
if (q->abort_request)
return -1;
pkt1.pkt = pkt;
pkt1.serial = q->serial;
ret = av_fifo_write(q->pkt_list, &pkt1, 1);
if (ret < 0)
return ret;
q->nb_packets++;
q->size += pkt1.pkt->size + sizeof(pkt1);
q->duration += pkt1.pkt->duration;
/* XXX: should duplicate packet data in DV case */
SDL_CondSignal(q->cond);
return 0;
}
static int packet_queue_put(PacketQueue *q, AVPacket *pkt)
{
AVPacket *pkt1;
int ret;
pkt1 = av_packet_alloc();
if (!pkt1)
{
av_packet_unref(pkt);
return -1;
}
av_packet_move_ref(pkt1, pkt);
SDL_LockMutex(q->mutex);
ret = packet_queue_put_private(q, pkt1);
SDL_UnlockMutex(q->mutex);
if (ret < 0)
av_packet_free(&pkt1);
return ret;
}
static int packet_queue_put_nullpacket(PacketQueue *q, AVPacket *pkt, int stream_index)
{
pkt->stream_index = stream_index;
return packet_queue_put(q, pkt);
}
/* packet queue handling */
static int packet_queue_init(PacketQueue *q)
{
memset(q, 0, sizeof(PacketQueue));
q->pkt_list = av_fifo_alloc2(1, sizeof(MyAVPacketList), AV_FIFO_FLAG_AUTO_GROW);
if (!q->pkt_list)
return AVERROR(ENOMEM);
q->mutex = SDL_CreateMutex();
if (!q->mutex)
{
av_log(NULL, AV_LOG_FATAL, "SDL_CreateMutex(): %s\n", SDL_GetError());
return AVERROR(ENOMEM);
}
q->cond = SDL_CreateCond();
if (!q->cond)
{
av_log(NULL, AV_LOG_FATAL, "SDL_CreateCond(): %s\n", SDL_GetError());
return AVERROR(ENOMEM);
}
q->abort_request = 1;
return 0;
}
static void packet_queue_flush(PacketQueue *q)
{
MyAVPacketList pkt1;
SDL_LockMutex(q->mutex);
while (av_fifo_read(q->pkt_list, &pkt1, 1) >= 0)
av_packet_free(&pkt1.pkt);
q->nb_packets = 0;
q->size = 0;
q->duration = 0;
q->serial++;
SDL_UnlockMutex(q->mutex);
}
static void packet_queue_destroy(PacketQueue *q)
{
packet_queue_flush(q);
av_fifo_freep2(&q->pkt_list);
SDL_DestroyMutex(q->mutex);
SDL_DestroyCond(q->cond);
}
static void packet_queue_abort(PacketQueue *q)
{
SDL_LockMutex(q->mutex);
q->abort_request = 1;
SDL_CondSignal(q->cond);
SDL_UnlockMutex(q->mutex);
}
static void packet_queue_start(PacketQueue *q)
{
SDL_LockMutex(q->mutex);
q->abort_request = 0;
q->serial++;
SDL_UnlockMutex(q->mutex);
}
/* return < 0 if aborted, 0 if no packet and > 0 if packet. */
static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block, int *serial)
{
MyAVPacketList pkt1;
int ret;
SDL_LockMutex(q->mutex);
for (;;)
{
if (q->abort_request)
{
ret = -1;
break;
}
if (av_fifo_read(q->pkt_list, &pkt1, 1) >= 0)
{
q->nb_packets--;
q->size -= pkt1.pkt->size + sizeof(pkt1);
q->duration -= pkt1.pkt->duration;
av_packet_move_ref(pkt, pkt1.pkt);
if (serial)
*serial = pkt1.serial;
av_packet_free(&pkt1.pkt);
ret = 1;
break;
}
else if (!block)
{
ret = 0;
break;
}
else
{
SDL_CondWait(q->cond, q->mutex);
}
}
SDL_UnlockMutex(q->mutex);
return ret;
}
static int decoder_init(Decoder *d, AVCodecContext *avctx, PacketQueue *queue, SDL_cond *empty_queue_cond)
{
memset(d, 0, sizeof(Decoder));
d->pkt = av_packet_alloc();
if (!d->pkt)
return AVERROR(ENOMEM);
d->avctx = avctx;
d->queue = queue;
d->empty_queue_cond = empty_queue_cond;
d->start_pts = AV_NOPTS_VALUE;
d->pkt_serial = -1;
return 0;
}
static int decoder_decode_frame(Decoder *d, AVFrame *frame, AVSubtitle *sub)
{
int ret = AVERROR(EAGAIN);
for (;;)
{
if (d->queue->serial == d->pkt_serial)
{
do
{
if (d->queue->abort_request)
return -1;
switch (d->avctx->codec_type)
{
case AVMEDIA_TYPE_VIDEO:
ret = avcodec_receive_frame(d->avctx, frame);
if (ret >= 0)
{
if (decoder_reorder_pts == -1)
{
frame->pts = frame->best_effort_timestamp;
}
else if (!decoder_reorder_pts)
{
frame->pts = frame->pkt_dts;
}
}
break;
case AVMEDIA_TYPE_AUDIO:
ret = avcodec_receive_frame(d->avctx, frame);
if (ret >= 0)
{
AVRational tb = (AVRational){1, frame->sample_rate};
if (frame->pts != AV_NOPTS_VALUE)
frame->pts = av_rescale_q(frame->pts, d->avctx->pkt_timebase, tb);
else if (d->next_pts != AV_NOPTS_VALUE)
frame->pts = av_rescale_q(d->next_pts, d->next_pts_tb, tb);
if (frame->pts != AV_NOPTS_VALUE)
{
d->next_pts = frame->pts + frame->nb_samples;
d->next_pts_tb = tb;
}
}
break;
}
if (ret == AVERROR_EOF)
{
d->finished = d->pkt_serial;
avcodec_flush_buffers(d->avctx);
return 0;
}
if (ret >= 0)
return 1;
} while (ret != AVERROR(EAGAIN));
}
do
{
if (d->queue->nb_packets == 0)
SDL_CondSignal(d->empty_queue_cond);
if (d->packet_pending)
{
d->packet_pending = 0;
}
else
{
int old_serial = d->pkt_serial;
if (packet_queue_get(d->queue, d->pkt, 1, &d->pkt_serial) < 0)
return -1;
if (old_serial != d->pkt_serial)
{
avcodec_flush_buffers(d->avctx);
d->finished = 0;
d->next_pts = d->start_pts;
d->next_pts_tb = d->start_pts_tb;
}
}
if (d->queue->serial == d->pkt_serial)
break;
av_packet_unref(d->pkt);
} while (1);
if (d->avctx->codec_type == AVMEDIA_TYPE_SUBTITLE)
{
int got_frame = 0;
ret = avcodec_decode_subtitle2(d->avctx, sub, &got_frame, d->pkt);
if (ret < 0)
{
ret = AVERROR(EAGAIN);
}
else
{
if (got_frame && !d->pkt->data)
{
d->packet_pending = 1;
}
ret = got_frame ? 0 : (d->pkt->data ? AVERROR(EAGAIN) : AVERROR_EOF);
}
av_packet_unref(d->pkt);
}
else
{
if (d->pkt->buf && !d->pkt->opaque_ref)
{
FrameData *fd;
d->pkt->opaque_ref = av_buffer_allocz(sizeof(*fd));
if (!d->pkt->opaque_ref)
return AVERROR(ENOMEM);
fd = (FrameData *)d->pkt->opaque_ref->data;
fd->pkt_pos = d->pkt->pos;
}
if (avcodec_send_packet(d->avctx, d->pkt) == AVERROR(EAGAIN))
{
av_log(d->avctx, AV_LOG_ERROR, "Receive_frame and send_packet both returned EAGAIN, which is an API violation.\n");
d->packet_pending = 1;
}
else
{
av_packet_unref(d->pkt);
}
}
}
}
static void decoder_destroy(Decoder *d)
{
av_packet_free(&d->pkt);
avcodec_free_context(&d->avctx);
}
static void frame_queue_unref_item(Frame *vp)
{
av_frame_unref(vp->frame);
avsubtitle_free(&vp->sub);
}
static int frame_queue_init(FrameQueue *f, PacketQueue *pktq, int max_size, int keep_last)
{
int i;
memset(f, 0, sizeof(FrameQueue));
if (!(f->mutex = SDL_CreateMutex()))
{
av_log(NULL, AV_LOG_FATAL, "SDL_CreateMutex(): %s\n", SDL_GetError());
return AVERROR(ENOMEM);
}
if (!(f->cond = SDL_CreateCond()))
{
av_log(NULL, AV_LOG_FATAL, "SDL_CreateCond(): %s\n", SDL_GetError());
return AVERROR(ENOMEM);
}
f->pktq = pktq;
f->max_size = FFMIN(max_size, FRAME_QUEUE_SIZE);
f->keep_last = !!keep_last;
for (i = 0; i < f->max_size; i++)
if (!(f->queue[i].frame = av_frame_alloc()))
return AVERROR(ENOMEM);
return 0;
}
static void frame_queue_destory(FrameQueue *f)
{
int i;
for (i = 0; i < f->max_size; i++)
{
Frame *vp = &f->queue[i];
frame_queue_unref_item(vp);
av_frame_free(&vp->frame);
}
SDL_DestroyMutex(f->mutex);
SDL_DestroyCond(f->cond);
}
static void frame_queue_signal(FrameQueue *f)
{
SDL_LockMutex(f->mutex);
SDL_CondSignal(f->cond);
SDL_UnlockMutex(f->mutex);
}
static Frame *frame_queue_peek(FrameQueue *f)
{
return &f->queue[(f->rindex + f->rindex_shown) % f->max_size];
}
static Frame *frame_queue_peek_next(FrameQueue *f)
{
return &f->queue[(f->rindex + f->rindex_shown + 1) % f->max_size];
}
static Frame *frame_queue_peek_last(FrameQueue *f)
{
return &f->queue[f->rindex];
}
static Frame *frame_queue_peek_writable(FrameQueue *f)
{
/* wait until we have space to put a new frame */
SDL_LockMutex(f->mutex);
while (f->size >= f->max_size &&
!f->pktq->abort_request)
{
SDL_CondWait(f->cond, f->mutex);
}
SDL_UnlockMutex(f->mutex);
if (f->pktq->abort_request)
return NULL;
return &f->queue[f->windex];
}
static Frame *frame_queue_peek_readable(FrameQueue *f)
{
/* wait until we have a readable a new frame */
SDL_LockMutex(f->mutex);
while (f->size - f->rindex_shown <= 0 &&
!f->pktq->abort_request)
{
SDL_CondWait(f->cond, f->mutex);
}
SDL_UnlockMutex(f->mutex);
if (f->pktq->abort_request)
return NULL;
return &f->queue[(f->rindex + f->rindex_shown) % f->max_size];
}
static void frame_queue_push(FrameQueue *f)
{
if (++f->windex == f->max_size)
f->windex = 0;
SDL_LockMutex(f->mutex);
f->size++;
SDL_CondSignal(f->cond);
SDL_UnlockMutex(f->mutex);
}
static void frame_queue_next(FrameQueue *f)
{
if (f->keep_last && !f->rindex_shown)
{
f->rindex_shown = 1;
return;
}
frame_queue_unref_item(&f->queue[f->rindex]);
if (++f->rindex == f->max_size)
f->rindex = 0;
SDL_LockMutex(f->mutex);
f->size--;
SDL_CondSignal(f->cond);
SDL_UnlockMutex(f->mutex);
}
/* return the number of undisplayed frames in the queue */
static int frame_queue_nb_remaining(FrameQueue *f)
{
return f->size - f->rindex_shown;
}
/* return last shown position */
static int64_t frame_queue_last_pos(FrameQueue *f)
{
Frame *fp = &f->queue[f->rindex];
if (f->rindex_shown && fp->serial == f->pktq->serial)
return fp->pos;
else
return -1;
}
static void decoder_abort(Decoder *d, FrameQueue *fq)
{
packet_queue_abort(d->queue);
frame_queue_signal(fq);
SDL_WaitThread(d->decoder_tid, NULL);
d->decoder_tid = NULL;
packet_queue_flush(d->queue);
}
static inline void fill_rectangle(int x, int y, int w, int h)
{
SDL_Rect rect;
rect.x = x;
rect.y = y;
rect.w = w;
rect.h = h;
if (w && h)
SDL_RenderFillRect(renderer, &rect);
}
static int realloc_texture(SDL_Texture **texture, Uint32 new_format, int new_width, int new_height, SDL_BlendMode blendmode, int init_texture)
{
Uint32 format;
int access, w, h;
if (!*texture || SDL_QueryTexture(*texture, &format, &access, &w, &h) < 0 || new_width != w || new_height != h || new_format != format)
{
void *pixels;
int pitch;
if (*texture)
SDL_DestroyTexture(*texture);
if (!(*texture = SDL_CreateTexture(renderer, new_format, SDL_TEXTUREACCESS_STREAMING, new_width, new_height)))
return -1;
if (SDL_SetTextureBlendMode(*texture, blendmode) < 0)
return -1;
if (init_texture)
{
if (SDL_LockTexture(*texture, NULL, &pixels, &pitch) < 0)
return -1;
memset(pixels, 0, pitch * new_height);
SDL_UnlockTexture(*texture);
}
av_log(NULL, AV_LOG_VERBOSE, "Created %dx%d texture with %s.\n", new_width, new_height, SDL_GetPixelFormatName(new_format));
}
return 0;
}
static void calculate_display_rect(SDL_Rect *rect,
int scr_xleft, int scr_ytop, int scr_width, int scr_height,
int pic_width, int pic_height, AVRational pic_sar)
{
AVRational aspect_ratio = pic_sar;
int64_t width, height, x, y;
if (av_cmp_q(aspect_ratio, av_make_q(0, 1)) <= 0)
aspect_ratio = av_make_q(1, 1);
aspect_ratio = av_mul_q(aspect_ratio, av_make_q(pic_width, pic_height));
/* XXX: we suppose the screen has a 1.0 pixel ratio */
height = scr_height;
width = av_rescale(height, aspect_ratio.num, aspect_ratio.den) & ~1;
if (width > scr_width)
{
width = scr_width;
height = av_rescale(width, aspect_ratio.den, aspect_ratio.num) & ~1;
}
x = (scr_width - width) / 2;
y = (scr_height - height) / 2;
rect->x = scr_xleft + x;
rect->y = scr_ytop + y;
rect->w = FFMAX((int)width, 1);
rect->h = FFMAX((int)height, 1);
}
static void get_sdl_pix_fmt_and_blendmode(int format, Uint32 *sdl_pix_fmt, SDL_BlendMode *sdl_blendmode)
{
int i;
*sdl_blendmode = SDL_BLENDMODE_NONE;
*sdl_pix_fmt = SDL_PIXELFORMAT_UNKNOWN;
if (format == AV_PIX_FMT_RGB32 ||
format == AV_PIX_FMT_RGB32_1 ||
format == AV_PIX_FMT_BGR32 ||
format == AV_PIX_FMT_BGR32_1)
*sdl_blendmode = SDL_BLENDMODE_BLEND;
for (i = 0; i < FF_ARRAY_ELEMS(sdl_texture_format_map) - 1; i++)
{
if (format == sdl_texture_format_map[i].format)
{
*sdl_pix_fmt = sdl_texture_format_map[i].texture_fmt;
return;
}
}
}
static int upload_texture(SDL_Texture **tex, AVFrame *frame)
{
int ret = 0;
Uint32 sdl_pix_fmt;
SDL_BlendMode sdl_blendmode;
get_sdl_pix_fmt_and_blendmode(frame->format, &sdl_pix_fmt, &sdl_blendmode);
if (realloc_texture(tex, sdl_pix_fmt == SDL_PIXELFORMAT_UNKNOWN ? SDL_PIXELFORMAT_ARGB8888 : sdl_pix_fmt, frame->width, frame->height, sdl_blendmode, 0) < 0)
return -1;
switch (sdl_pix_fmt)
{
case SDL_PIXELFORMAT_IYUV:
if (frame->linesize[0] > 0 && frame->linesize[1] > 0 && frame->linesize[2] > 0)
{
ret = SDL_UpdateYUVTexture(*tex, NULL, frame->data[0], frame->linesize[0],
frame->data[1], frame->linesize[1],
frame->data[2], frame->linesize[2]);
}
else if (frame->linesize[0] < 0 && frame->linesize[1] < 0 && frame->linesize[2] < 0)
{
ret = SDL_UpdateYUVTexture(*tex, NULL, frame->data[0] + frame->linesize[0] * (frame->height - 1), -frame->linesize[0],
frame->data[1] + frame->linesize[1] * (AV_CEIL_RSHIFT(frame->height, 1) - 1), -frame->linesize[1],
frame->data[2] + frame->linesize[2] * (AV_CEIL_RSHIFT(frame->height, 1) - 1), -frame->linesize[2]);
}
else
{
av_log(NULL, AV_LOG_ERROR, "Mixed negative and positive linesizes are not supported.\n");