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avplay.c
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#include <stdlib.h>
#include <math.h>
#include <float.h>
#include "avplay.h"
/* 定义bool值 */
#ifndef _MSC_VER
enum bool_type
{
FALSE, TRUE
};
#endif
/* 队列类型. */
#define QUEUE_PACKET 0
#define QUEUE_AVFRAME 1
#define IO_BUFFER_SIZE 32768
#define MAX_PKT_BUFFER_SIZE 5242880
#define MIN_AUDIO_BUFFER_SIZE MAX_PKT_BUFFER_SIZE /* 327680 */
#define MIN_AV_FRAMES 5
#define AUDIO_BUFFER_MAX_SIZE (AVCODEC_MAX_AUDIO_FRAME_SIZE * 2)
#define AVDECODE_BUFFER_SIZE 2
#define DEVIATION 6
#define AV_SYNC_THRESHOLD 0.01f
#define AV_NOSYNC_THRESHOLD 10.0f
#define AUDIO_DIFF_AVG_NB 20
#define SEEKING_FLAG -1
#define NOSEEKING_FLAG 0
/* INT64最大最小取值范围. */
#ifndef INT64_MIN
#define INT64_MIN (-9223372036854775807LL - 1)
#endif
#ifndef INT64_MAX
#define INT64_MAX (9223372036854775807LL)
#endif
/* rgb和yuv互换. */
#define _r(c) ((c) & 0xFF)
#define _g(c) (((c) >> 8) & 0xFF)
#define _b(c) (((c) >> 16) & 0xFF)
#define _a(c) ((c) >> 24)
#define rgba2y(c) ( (( 263*_r(c) + 516*_g(c) + 100*_b(c)) >> 10) + 16 )
#define rgba2u(c) ( ((-152*_r(c) - 298*_g(c) + 450*_b(c)) >> 10) + 128 )
#define rgba2v(c) ( (( 450*_r(c) - 376*_g(c) - 73*_b(c)) >> 10) + 128 )
#define MAX_TRANS 255
#define TRANS_BITS 8
typedef struct AVFrameList
{
AVFrame pkt;
struct AVFrameList *next;
} AVFrameList;
/* 队列操作. */
static void queue_init(av_queue *q);
static void queue_flush(av_queue *q);
static void queue_end(av_queue *q);
/* 入队出队列操作. */
static int get_queue(av_queue *q, void *p);
static int put_queue(av_queue *q, void *p);
static void chk_queue(avplay *play, av_queue *q, int size);
/* ffmpeg相关操作函数. */
static int stream_index(enum AVMediaType type, AVFormatContext *ctx);
static int open_decoder(AVCodecContext *ctx);
static int open_decoder2(AVCodecContext **context, enum AVCodecID codec_id);
/* 读取数据线程. */
static void* read_pkt_thrd(void *param);
static void* video_dec_thrd(void *param);
static void* audio_dec_thrd(void *param);
/* 渲染线程. */
static void* audio_render_thrd(void *param);
static void* video_render_thrd(void *param);
/* 视频帧复制. */
static void video_copy(avplay *play, AVFrame *dst, AVFrame *src);
static void audio_copy(avplay *play, AVFrame *dst, AVFrame *src);
/* 更新视频pts. */
static void update_video_pts(avplay *play, double pts, int64_t pos);
/* 时钟函数. */
static double video_clock(avplay *play);
static double audio_clock(avplay *play);
static double external_clock(avplay *play);
static double master_clock(avplay *play);
/* 读写数据函数. */
static int read_packet(void *opaque, uint8_t *buf, int buf_size);
static int write_packet(void *opaque, uint8_t *buf, int buf_size);
static int64_t seek_packet(void *opaque, int64_t offset, int whence);
AVPacket flush_pkt;
AVFrame flush_frm;
static
void
queue_init(av_queue *q)
{
q->abort_request = 0;
q->m_first_pkt = q->m_last_pkt = NULL;
q->m_size = 0;
pthread_mutex_init(&q->m_mutex, NULL);
pthread_cond_init(&q->m_cond, NULL);
if (q->m_type == QUEUE_PACKET)
put_queue(q, (void*) &flush_pkt);
else if (q->m_type == QUEUE_AVFRAME)
put_queue(q, (void*) &flush_frm);
}
static
void queue_flush(av_queue *q)
{
if (q->m_size == 0)
return;
if (q->m_type == QUEUE_PACKET)
{
AVPacketList *pkt, *pkt1;
pthread_mutex_lock(&q->m_mutex);
for (pkt = q->m_first_pkt; pkt != NULL; pkt = pkt1)
{
pkt1 = pkt->next;
if (pkt->pkt.data != flush_pkt.data)
av_free_packet(&pkt->pkt);
av_freep(&pkt);
}
q->m_last_pkt = NULL;
q->m_first_pkt = NULL;
q->m_size = 0;
pthread_mutex_unlock(&q->m_mutex);
}
else if (q->m_type == QUEUE_AVFRAME)
{
AVFrameList *pkt, *pkt1;
pthread_mutex_lock(&q->m_mutex);
for (pkt = q->m_first_pkt; pkt != NULL; pkt = pkt1)
{
pkt1 = pkt->next;
if (pkt->pkt.data[0] != flush_frm.data[0])
av_free(pkt->pkt.data[0]);
av_freep(&pkt);
}
q->m_last_pkt = NULL;
q->m_first_pkt = NULL;
q->m_size = 0;
pthread_mutex_unlock(&q->m_mutex);
}
}
static
void queue_end(av_queue *q)
{
queue_flush(q);
#ifdef WIN32
if (q->m_cond)
pthread_cond_destroy(&q->m_cond);
if (q->m_mutex)
pthread_mutex_destroy(&q->m_mutex);
#else
pthread_cond_destroy(&q->m_cond);
pthread_mutex_destroy(&q->m_mutex);
#endif
}
#define PRIV_OUT_QUEUE \
pthread_mutex_lock(&q->m_mutex); \
for (;;) \
{ \
if (q->abort_request) \
{ \
ret = -1; \
break; \
} \
pkt1 = q->m_first_pkt; \
if (pkt1) \
{ \
q->m_first_pkt = pkt1->next; \
if (!q->m_first_pkt) \
q->m_last_pkt = NULL; \
q->m_size--; \
*pkt = pkt1->pkt; \
av_free(pkt1); \
ret = 1; \
break; \
} \
else \
{ \
pthread_cond_wait(&q->m_cond, &q->m_mutex); \
} \
} \
pthread_mutex_unlock(&q->m_mutex);
static
int get_queue(av_queue *q, void *p)
{
if (q->m_type == QUEUE_PACKET)
{
AVPacketList *pkt1;
AVPacket *pkt = (AVPacket*) p;
int ret;
PRIV_OUT_QUEUE
return ret;
}
else if (q->m_type == QUEUE_AVFRAME)
{
AVFrameList *pkt1;
AVFrame *pkt = (AVFrame*) p;
int ret;
PRIV_OUT_QUEUE
return ret;
}
return -1;
}
#define PRIV_PUT_QUEUE(type) \
pkt1 = av_malloc(sizeof(type)); \
if (!pkt1) \
return -1; \
pkt1->pkt = *pkt; \
pkt1->next = NULL; \
\
pthread_mutex_lock(&q->m_mutex); \
if (!q->m_last_pkt) \
q->m_first_pkt = pkt1; \
else \
((type*) q->m_last_pkt)->next = pkt1; \
q->m_last_pkt = pkt1; \
q->m_size++; \
pthread_cond_signal(&q->m_cond); \
pthread_mutex_unlock(&q->m_mutex);
static
int put_queue(av_queue *q, void *p)
{
if (q->m_type == QUEUE_PACKET)
{
AVPacketList *pkt1;
AVPacket *pkt = (AVPacket*) p;
/* duplicate the packet */
if (pkt != &flush_pkt && av_dup_packet(pkt) < 0)
return -1;
PRIV_PUT_QUEUE(AVPacketList)
return 0;
}
else if (q->m_type == QUEUE_AVFRAME)
{
AVFrameList *pkt1;
AVFrame *pkt = (AVFrame*) p;
PRIV_PUT_QUEUE(AVFrameList)
return 0;
}
return -1;
}
static
media_info* find_media_info(source_context *sc, int index)
{
bt_source_info *bt_info = &sc->info.bt;
// 检查参数有效性.
if (sc->type != MEDIA_TYPE_BT || index < 0 || index > bt_info->info_size)
return NULL;
// 返回对应的media_info信息.
return &bt_info->info[index];
}
static
int stream_index(enum AVMediaType type, AVFormatContext *ctx)
{
unsigned int i;
for (i = 0; (unsigned int) i < ctx->nb_streams; i++)
if (ctx->streams[i]->codec->codec_type == type)
return i;
return -1;
}
static
int open_decoder(AVCodecContext *ctx)
{
int ret = 0;
AVCodec *codec = NULL;
/* 查找解码器. */
codec = avcodec_find_decoder(ctx->codec_id);
if (!codec)
return -1;
/* 打开解码器. */
ret = avcodec_open2(ctx, codec, NULL);
if (ret != 0)
return ret;
return ret;
}
static
int open_decoder2(AVCodecContext **context, enum AVCodecID codec_id)
{
int ret = 0;
AVCodec *codec = NULL;
/* 查找解码器. */
codec = avcodec_find_decoder(codec_id);
if (!codec)
return -1;
/*
*context = avcodec_alloc_context3(codec);
if (avcodec_get_context_defaults3(*context, codec) < 0)
return -1;
*/
/* 打开解码器. */
if (avcodec_open2(*context, codec, NULL) < 0)
{
avcodec_close(*context);
av_free(*context);
*context = NULL;
return -1;
}
return 0;
}
source_context* alloc_media_source(int type, const char *data, int len, int64_t size)
{
/* 分配一个source_context结构. */
struct source_context *ptr = calloc(1, sizeof(source_context));
/* 参数赋值. */
ptr->type = type;
if (type == MEDIA_TYPE_FILE)
{
file_source_info *file_info = &ptr->info.file;
strcpy(file_info->file_name, (const char*)data); /* 保存文件名. */
}
else if (type == MEDIA_TYPE_BT)
{
bt_source_info *bt_info = &ptr->info.bt;
bt_info->torrent_data = (char*)malloc(len);
memcpy(bt_info->torrent_data, data, len); /* 保存torrent数据. */
bt_info->torrent_length = len;
}
else if (type == MEDIA_TYPE_YK)
{
yk_source_info *yk_info = &ptr->info.yk;
strcpy(yk_info->url, data); /* 保存url. */
}
else if (type == MEDIA_TYPE_HTTP)
{
http_source_info *http_info = &ptr->info.http;
strcpy(http_info->url, data); /* 保存url. */
}
else if (type == MEDIA_TYPE_RTSP)
{
rtsp_source_info *rtsp_info = &ptr->info.rtsp;
strcpy(rtsp_info->url, data); /* 保存url. */
}
else
{
assert(0);
}
return ptr;
}
/*
void set_download_path(avplay *play, const char *save_path)
{
if (play->m_source_ctx->type == MEDIA_TYPE_BT)
{
bt_source_info *bt_info = &play->m_source_ctx->info.bt;
strcpy(bt_info->save_path, save_path);
}
else if (play->m_source_ctx->type == MEDIA_TYPE_YK)
{
yk_source_info *yk_info = &play->m_source_ctx->info.yk;
strcpy(yk_info->save_path, save_path);
}
}
*/
/*
void set_youku_type(avplay *play, int type)
{
play->m_source_ctx->info.yk.type = type;
}
*/
void free_media_source(source_context *ctx)
{
/* 释放priv指针. */
if (ctx->priv)
ctx->destory(ctx);
/* 释放bt类型中的torrent内存. */
if (ctx->type == MEDIA_TYPE_BT)
{
free(ctx->info.bt.torrent_data);
}
/* 最后释放整个source_context. */
free(ctx);
}
avplay* alloc_avplay_context()
{
struct avplay *ptr = calloc(1, sizeof(avplay));
return ptr;
}
void free_avplay_context(avplay *ctx)
{
free(ctx);
}
ao_context* alloc_audio_render()
{
ao_context *ptr = calloc(1, sizeof(ao_context));
return ptr;
}
void free_audio_render(ao_context *ctx)
{
if (ctx->priv)
ctx->destory_audio(ctx);
free(ctx);
}
vo_context* alloc_video_render(void *user_data)
{
struct vo_context *ptr = calloc(1, sizeof(vo_context));
ptr->user_data = user_data;
return ptr;
}
void free_video_render(vo_context *ctx)
{
if (ctx->priv)
ctx->destory_video(ctx);
free(ctx);
}
demux_context* alloc_demux_context()
{
return calloc(1, sizeof(demux_context));
}
void free_demux_context(demux_context *ctx)
{
if (ctx)
ctx->destory(ctx);
free(ctx);
}
int initialize(avplay *play, const char *file_name, int source_type, demux_context *dc)
{
if (!play || !file_name || !dc)
return -1;
av_register_all();
avcodec_register_all();
avformat_network_init();
/* 置0. */
memset(play, 0, sizeof(avplay));
/* 保存demux_context. */
play->m_demux_context = dc;
/* 设置source type. */
play->m_generic_info = &dc->info.generic;
dc->type = source_type;
strcpy(play->m_generic_info->file_name, file_name); /* 保存文件名到generic_info.file_name, 以便其在初始化demux时使用. */
/* 初始化demux的source. */
if (dc->init_demux(dc) == -1)
goto FAILED_FLG;
/* 得到audio和video在streams中的index. */
play->m_video_index =
dc->stream_index(dc, AVMEDIA_TYPE_VIDEO);
play->m_audio_index =
dc->stream_index(dc, AVMEDIA_TYPE_AUDIO);
play->m_base_info = &dc->base_info;
if (play->m_video_index == -1 && play->m_audio_index == -1)
goto FAILED_FLG;
/* 打开解码器. */
if (play->m_audio_index != -1)
{
AVCodec *codec = NULL;
/* 查找解码器. */
codec = avcodec_find_decoder(play->m_base_info->audio_codec->codec_id);
play->m_audio_ctx = avcodec_alloc_context3(codec);
avcodec_copy_context(play->m_audio_ctx, play->m_base_info->audio_codec);
if (open_decoder2(&play->m_audio_ctx, dc->query_avcodec_id(dc, play->m_audio_index)) != 0)
goto FAILED_FLG;
}
if (play->m_video_index != -1)
{
AVCodec *codec = NULL;
/* 查找解码器. */
codec = avcodec_find_decoder(play->m_base_info->video_codec->codec_id);
play->m_video_ctx = avcodec_alloc_context3(codec);
avcodec_copy_context(play->m_video_ctx, play->m_base_info->video_codec);
if (open_decoder2(&play->m_video_ctx, dc->query_avcodec_id(dc, play->m_video_index)) != 0)
goto FAILED_FLG;
}
/* 默认同步到音频. */
play->m_av_sync_type = AV_SYNC_AUDIO_MASTER;
play->m_abort = TRUE;
/* 初始化各变量. */
av_init_packet(&flush_pkt);
flush_pkt.data = (uint8_t*)"FLUSH";
flush_frm.data[0] = (uint8_t*)"FLUSH";
play->m_abort = 0;
/* 初始化队列. */
if (play->m_audio_index != -1)
{
play->m_audio_q.m_type = QUEUE_PACKET;
queue_init(&play->m_audio_q);
play->m_audio_dq.m_type = QUEUE_AVFRAME;
queue_init(&play->m_audio_dq);
}
if (play->m_video_index != -1)
{
play->m_video_q.m_type = QUEUE_PACKET;
queue_init(&play->m_video_q);
play->m_video_dq.m_type = QUEUE_AVFRAME;
queue_init(&play->m_video_dq);
}
/* 初始化读取文件数据缓冲计数mutex. */
pthread_mutex_init(&play->m_buf_size_mtx, NULL);
/* 打开各线程. */
return 0;
FAILED_FLG:
if (play->m_demux_context)
{
play->m_demux_context->destory(play->m_demux_context); // ? free_demux_context(play->m_demux_context);
}
return -1;
}
int av_start(avplay *play, double fact, int index)
{
pthread_attr_t attr;
int ret;
/* 保存正在播放的索引号. */
play->m_current_play_index = index;
/* 计算时长. */
play->m_duration = (double)play->m_demux_context->base_info.duration / AV_TIME_BASE;
/* 保存起始播放时间. */
play->m_start_time = fact;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
/* 创建线程. */
ret = pthread_create(&play->m_read_pkt_thrd, &attr, read_pkt_thrd,
(void*) play);
if (ret)
{
printf("ERROR; return code from pthread_create() is %d\n", ret);
return ret;
}
if (play->m_audio_index != -1)
{
/*play->m_audio_current_pts_drift = av_gettime() / 1000000.0f;*/
ret = pthread_create(&play->m_audio_dec_thrd, &attr, audio_dec_thrd,
(void*) play);
if (ret)
{
printf("ERROR; return code from pthread_create() is %d\n", ret);
return ret;
}
}
if (play->m_video_index != -1)
{
ret = pthread_create(&play->m_video_dec_thrd, &attr, video_dec_thrd,
(void*) play);
if (ret)
{
printf("ERROR; return code from pthread_create() is %d\n", ret);
return ret;
}
}
if (play->m_audio_index != -1)
{
ret = pthread_create(&play->m_audio_render_thrd, &attr, audio_render_thrd,
(void*) play);
if (ret)
{
printf("ERROR; return code from pthread_create() is %d\n", ret);
return ret;
}
}
if (play->m_video_index != -1)
{
ret = pthread_create(&play->m_video_render_thrd, &attr, video_render_thrd,
(void*) play);
if (ret)
{
printf("ERROR; return code from pthread_create() is %d\n", ret);
return ret;
}
}
play->m_play_status = playing;
return 0;
}
void configure(avplay *play, void *param, int type)
{
switch (type)
{
case AUDIO_RENDER:
{
if (play->m_ao_ctx && play->m_ao_ctx->priv)
free_audio_render(play->m_ao_ctx);
play->m_ao_ctx = (ao_context*)param;
}
break;
case VIDEO_RENDER:
{
if (play->m_vo_ctx && play->m_vo_ctx->priv)
free_video_render(play->m_vo_ctx);
play->m_vo_ctx = (vo_context*)param;
}
break;
case MEDIA_DEMUX:
{
if (play->m_demux_context && play->m_demux_context->priv)
play->m_demux_context->destory(play->m_demux_context);
free_demux_context(play->m_demux_context);
play->m_demux_context = (demux_context*)param;
}
break;
default:
assert(0);
}
}
void enable_calc_frame_rate(avplay *play)
{
play->m_enable_calc_frame_rate = 1;
}
void enable_calc_bit_rate(avplay *play)
{
play->m_enable_calc_video_bite = 1;
}
int current_bit_rate(avplay *play)
{
return play->m_real_bit_rate;
}
int current_frame_rate(avplay *play)
{
return play->m_real_frame_rate;
}
void wait_for_completion(avplay *play)
{
while (play->m_play_status == playing ||
play->m_play_status == paused)
{
av_usleep(100000);
}
}
void wait_for_threads(avplay *play)
{
void *status = NULL;
pthread_join(play->m_read_pkt_thrd, &status);
if (play->m_audio_index != -1)
pthread_join(play->m_audio_dec_thrd, &status);
if (play->m_video_index != -1)
pthread_join(play->m_video_dec_thrd, &status);
if (play->m_audio_index != -1)
pthread_join(play->m_audio_render_thrd, &status);
if (play->m_video_index != -1)
pthread_join(play->m_video_render_thrd, &status);
}
void av_stop(avplay *play)
{
play->m_abort = TRUE;
if (play->m_demux_context)
play->m_demux_context->abort = TRUE;
/* 通知各线程退出. */
play->m_audio_q.abort_request = TRUE;
pthread_cond_signal(&play->m_audio_q.m_cond);
play->m_video_q.abort_request = TRUE;
pthread_cond_signal(&play->m_video_q.m_cond);
play->m_audio_dq.abort_request = TRUE;
pthread_cond_signal(&play->m_audio_dq.m_cond);
play->m_video_dq.abort_request = TRUE;
pthread_cond_signal(&play->m_video_dq.m_cond);
/* 先等线程退出, 再释放资源. */
wait_for_threads(play);
queue_end(&play->m_audio_q);
queue_end(&play->m_video_q);
queue_end(&play->m_audio_dq);
queue_end(&play->m_video_dq);
/* 关闭解码器以及渲染器. */
if (play->m_demux_context)
{
if (play->m_audio_ctx)
{
avcodec_close(play->m_audio_ctx);
av_free(play->m_audio_ctx);
play->m_audio_ctx = NULL;
}
if (play->m_video_ctx)
{
avcodec_close(play->m_video_ctx);
av_free(play->m_video_ctx);
play->m_video_ctx = NULL;
}
}
if (play->m_swr_ctx)
swr_free(&play->m_swr_ctx);
if (play->m_resample_ctx)
audio_resample_close(play->m_resample_ctx);
#ifdef WIN32
if (play->m_buf_size_mtx)
#endif
pthread_mutex_destroy(&play->m_buf_size_mtx);
if (play->m_ao_ctx)
{
free_audio_render(play->m_ao_ctx);
play->m_ao_ctx = NULL;
play->m_ao_inited = 0;
}
if (play->m_vo_ctx)
{
free_video_render(play->m_vo_ctx);
play->m_vo_ctx = NULL;
}
/* 更改播放状态. */
play->m_play_status = stoped;
avformat_network_deinit();
}
void av_pause(avplay *play)
{
/* 一直等待为渲染状态时才控制为暂停, 原因是这样可以在暂停时继续渲染而不至于黑屏. */
while (!play->m_rendering)
av_usleep(1000);
/* 更改播放状态. */
play->m_play_status = paused;
}
void av_resume(avplay *play)
{
/* 更改播放状态. */
play->m_play_status = playing;
}
void av_seek(avplay *play, double fact)
{
/* 正在seek中, 只保存当前sec, 在seek完成后, 再seek. */
if (play->m_seeking == SEEKING_FLAG ||
(play->m_seeking > NOSEEKING_FLAG && play->m_seek_req))
{
play->m_seeking = fact * 1000;
return ;
}
/* 正常情况下的seek. */
if (fabs(play->m_duration - 0) < DBL_EPSILON)
{
int64_t size = play->m_demux_context->base_info.file_size;
if (!play->m_seek_req)
{
play->m_seek_req = 1;
play->m_seeking = SEEKING_FLAG;
play->m_seek_pos = fact * size;
play->m_seek_rel = 0;
play->m_seek_flags &= ~AVSEEK_FLAG_BYTE;
play->m_seek_flags |= AVSEEK_FLAG_BYTE;
}
}
else
{
if (!play->m_seek_req)
{
play->m_seek_req = 1;
play->m_seeking = SEEKING_FLAG;
play->m_seek_pos = fact * play->m_duration;
play->m_seek_rel = 0;
play->m_seek_flags &= ~AVSEEK_FLAG_BYTE;
/* play->m_seek_flags |= AVSEEK_FLAG_BYTE; */
}
}
}
int av_volume(avplay *play, double l, double r)
{
if (play->m_ao_inited)
{
play->m_ao_ctx->audio_control(play->m_ao_ctx, l, r);
return 0;
}
return -1;
}
void av_mute_set(avplay *play, int s)
{
play->m_ao_ctx->mute_set(play->m_ao_ctx, s);
}
double av_curr_play_time(avplay *play)
{
return master_clock(play);
}
double av_duration(avplay *play)
{
return play->m_duration;
}
void av_destory(avplay *play)
{
/* 如果正在播放, 则关闭播放. */
if (play->m_play_status != stoped && play->m_play_status != inited)
{
play->m_abort = TRUE;
if (play->m_demux_context)
play->m_demux_context->abort = TRUE;
/* 关闭demux和source. */
if (play->m_demux_context && play->m_demux_context->priv)
play->m_demux_context->destory(play->m_demux_context);
av_stop(play);
}
free(play);
}
static
void audio_copy(avplay *play, AVFrame *dst, AVFrame* src)
{
int nb_sample;
int dst_buf_size;
int out_channels;
int bytes_per_sample = 0;
dst->linesize[0] = src->linesize[0];
*dst = *src;
dst->data[0] = NULL;
dst->type = 0;
/* 备注: FFMIN(play->m_audio_ctx->channels, 2); 会有问题, 因为swr_alloc_set_opts的out_channel_layout参数. */
out_channels = play->m_audio_ctx->channels;
bytes_per_sample = av_get_bytes_per_sample(play->m_audio_ctx->sample_fmt);
/* 备注: 由于 src->linesize[0] 可能是错误的, 所以计算得到的nb_sample会不正确, 直接使用src->nb_samples即可. */
nb_sample = src->nb_samples;/* src->linesize[0] / play->m_audio_ctx->channels / bytes_per_sample; */
bytes_per_sample = av_get_bytes_per_sample(AV_SAMPLE_FMT_S16);
dst_buf_size = nb_sample * bytes_per_sample * out_channels;
dst->data[0] = (uint8_t*) av_malloc(dst_buf_size);
assert(dst->data[0]);
avcodec_fill_audio_frame(dst, out_channels, AV_SAMPLE_FMT_S16, dst->data[0], dst_buf_size, 0);
/* 重采样到AV_SAMPLE_FMT_S16格式. */
if (play->m_audio_ctx->sample_fmt != AV_SAMPLE_FMT_S16)
{
if (!play->m_swr_ctx)
{
uint64_t in_channel_layout = av_get_default_channel_layout(play->m_audio_ctx->channels);
uint64_t out_channel_layout = av_get_default_channel_layout(out_channels);
play->m_swr_ctx = swr_alloc_set_opts(NULL,
out_channel_layout, AV_SAMPLE_FMT_S16, play->m_audio_ctx->sample_rate,
in_channel_layout, play->m_audio_ctx->sample_fmt, play->m_audio_ctx->sample_rate,
0, NULL);
swr_init(play->m_swr_ctx);
}
if (play->m_swr_ctx)
{
int ret, out_count;
out_count = dst_buf_size / out_channels / av_get_bytes_per_sample(AV_SAMPLE_FMT_S16);
ret = swr_convert(play->m_swr_ctx, dst->data, out_count, src->data, nb_sample);
if (ret < 0)
assert(0);
src->linesize[0] = dst->linesize[0] = ret * av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) * out_channels;
memcpy(src->data[0], dst->data[0], src->linesize[0]);
}
}
/* 重采样到双声道. */
if (play->m_audio_ctx->channels > 2)
{
if (!play->m_resample_ctx)
{
play->m_resample_ctx = av_audio_resample_init(
FFMIN(2, play->m_audio_ctx->channels),
play->m_audio_ctx->channels, play->m_audio_ctx->sample_rate,
play->m_audio_ctx->sample_rate, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16,
16, 10, 0, 0.f);
}
if (play->m_resample_ctx)
{
int samples = src->linesize[0] / (av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) * play->m_audio_ctx->channels);
dst->linesize[0] = audio_resample(play->m_resample_ctx,
(short *) dst->data[0], (short *) src->data[0], samples) * 4;
}
}
else
{
dst->linesize[0] = dst->linesize[0];
memcpy(dst->data[0], src->data[0], dst->linesize[0]);
}
}
static
void video_copy(avplay *play, AVFrame *dst, AVFrame *src)
{
uint8_t *buffer;
int len = avpicture_get_size(PIX_FMT_YUV420P, play->m_video_ctx->width,
play->m_video_ctx->height);
*dst = *src;
buffer = (uint8_t*) av_malloc(len);
assert(buffer);
avpicture_fill((AVPicture*) &(*dst), buffer, PIX_FMT_YUV420P,
play->m_video_ctx->width, play->m_video_ctx->height);
play->m_swsctx = sws_getContext(play->m_video_ctx->width,
play->m_video_ctx->height, play->m_video_ctx->pix_fmt,
play->m_video_ctx->width, play->m_video_ctx->height,
PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
sws_scale(play->m_swsctx, src->data, src->linesize, 0,
play->m_video_ctx->height, dst->data, dst->linesize);
sws_freeContext(play->m_swsctx);
}
static
void update_video_pts(avplay *play, double pts, int64_t pos)
{
double time = (double)av_gettime() / 1000000.0;
/* update current video pts */
play->m_video_current_pts = pts;
play->m_video_current_pts_drift = play->m_video_current_pts - time;
play->m_video_current_pos = pos;
play->m_frame_last_pts = pts;
}
static
double audio_clock(avplay *play)
{
double pts;
int hw_buf_size, bytes_per_sec;
pts = play->m_audio_clock;
hw_buf_size = play->m_audio_buf_size - play->m_audio_buf_index;
bytes_per_sec = 0;
if (play->m_base_info->has_audio != -1)
{
/* 固定为2通道, 采样格式为AV_SAMPLE_FMT_S16.*/
bytes_per_sec = play->m_base_info->sample_rate * 2 * FFMIN(play->m_base_info->channels, 2);
}