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ffmpeg_tutorial04 SDL2.0 and resampling version
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ffmpeg_tutorial04.c
// tutorial04.c
// A pedagogical video player that will stream through every video frame as fast as it can,
// and play audio (out of sync).
//
// Code based on FFplay, Copyright (c) 2003 Fabrice Bellard,
// and a tutorial by Martin Bohme (boehme@inb.uni-luebeckREMOVETHIS.de)
// Tested on Gentoo, CVS version 5/01/07 compiled with GCC 4.1.1
// With updates from https://github.com/chelyaev/ffmpeg-tutorial
// Updates tested on:
// LAVC 54.59.100, LAVF 54.29.104, LSWS 2.1.101, SDL 1.2.15
// on GCC 4.7.2 in Debian February 2015
// Use
//
// gcc -o tutorial04 ffmpeg_tutorial04.c -lavformat -lavcodec -lswscale -lavutil -lswresample -lz -ldl `sdl2-config --cflags --libs`
// to build (assuming libavformat and libavcodec are correctly installed,
// and assuming you have sdl-config. Please refer to SDL docs for your installation.)
//
// Run using
// tutorial04 myvideofile.mpg
//
// to play the video stream on your screen.
#include <libavutil/opt.h>
#include <libavutil/samplefmt.h>
#include <libavcodec/avcodec.h>
#include <libavutil/avstring.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libswresample/swresample.h>
#include <SDL.h>
#include <SDL_thread.h>
#ifdef __MINGW32__
#undef main /* Prevents SDL from overriding main() */
#endif
#include <stdio.h>
#include <assert.h>
#include <math.h>
// compatibility with newer API
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1)
#define av_frame_alloc avcodec_alloc_frame
#define av_frame_free avcodec_free_frame
#endif
#define SDL_AUDIO_BUFFER_SIZE 1024
#define MAX_AUDIO_FRAME_SIZE 192000
#define MAX_AUDIOQ_SIZE (5 * 16 * 1024)
#define MAX_VIDEOQ_SIZE (5 * 256 * 1024)
#define FF_REFRESH_EVENT (SDL_USEREVENT)
#define FF_QUIT_EVENT (SDL_USEREVENT + 1)
#define VIDEO_PICTURE_QUEUE_SIZE 1
#define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
typedef struct PacketQueue {
AVPacketList *first_pkt, *last_pkt;
int nb_packets;
int size;
SDL_mutex *mutex;
SDL_cond *cond;
} PacketQueue;
typedef struct VideoPicture {
/* SDL_Overlay *bmp; */
SDL_Texture *texture;
Uint8 *yPlane, *uPlane, *vPlane;
size_t yPlaneSz, uvPlaneSz;
int uvPitch;
int width, height; /* source height & width */
int allocated;
} VideoPicture;
typedef struct VideoState {
AVFormatContext *pFormatCtx;
int videoStream, audioStream;
AVStream *audio_st;
AVCodecContext *audio_ctx;
PacketQueue audioq;
uint8_t audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2];
unsigned int audio_buf_size;
unsigned int audio_buf_index;
AVFrame audio_frame;
AVPacket audio_pkt;
uint8_t *audio_pkt_data;
int audio_pkt_size;
AVStream *video_st;
AVCodecContext *video_ctx;
PacketQueue videoq;
struct SwsContext *sws_ctx;
VideoPicture pictq[VIDEO_PICTURE_QUEUE_SIZE];
int pictq_size, pictq_rindex, pictq_windex;
SDL_mutex *pictq_mutex;
SDL_cond *pictq_cond;
SDL_Thread *parse_tid;
SDL_Thread *video_tid;
char filename[1024];
int quit;
} VideoState;
/* SDL_Surface *screen; */
SDL_Window *screen = NULL;
SDL_mutex *screen_mutex;
SDL_Renderer *renderer = NULL;
/* Since we only have one decoding thread, the Big Struct
can be global in case we need it. */
VideoState *global_video_state;
void packet_queue_init(PacketQueue *q) {
memset(q, 0, sizeof(PacketQueue));
q->mutex = SDL_CreateMutex();
q->cond = SDL_CreateCond();
}
int packet_queue_put(PacketQueue *q, AVPacket *pkt) {
AVPacketList *pkt1;
if(av_dup_packet(pkt) < 0) {
return -1;
}
pkt1 = av_malloc(sizeof(AVPacketList));
if (!pkt1)
return -1;
pkt1->pkt = *pkt;
pkt1->next = NULL;
SDL_LockMutex(q->mutex);
if (!q->last_pkt)
q->first_pkt = pkt1;
else
q->last_pkt->next = pkt1;
q->last_pkt = pkt1;
q->nb_packets++;
q->size += pkt1->pkt.size;
SDL_CondSignal(q->cond);
SDL_UnlockMutex(q->mutex);
return 0;
}
static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block)
{
AVPacketList *pkt1;
int ret;
SDL_LockMutex(q->mutex);
for(;;) {
if(global_video_state->quit) {
ret = -1;
break;
}
pkt1 = q->first_pkt;
if (pkt1) {
q->first_pkt = pkt1->next;
if (!q->first_pkt)
q->last_pkt = NULL;
q->nb_packets--;
q->size -= pkt1->pkt.size;
*pkt = pkt1->pkt;
av_free(pkt1);
ret = 1;
break;
} else if (!block) {
ret = 0;
break;
} else {
SDL_CondWait(q->cond, q->mutex);
}
}
SDL_UnlockMutex(q->mutex);
return ret;
}
static int audio_resampling(AVCodecContext *audio_decode_ctx,
AVFrame *audio_decode_frame,
enum AVSampleFormat out_sample_fmt,
int out_channels,
int out_sample_rate,
uint8_t *out_buf)
{
SwrContext *swr_ctx = NULL;
int ret = 0;
int64_t in_channel_layout = audio_decode_ctx->channel_layout;
int64_t out_channel_layout = AV_CH_LAYOUT_STEREO;
int out_nb_channels = 0;
int out_linesize = 0;
int in_nb_samples = 0;
int out_nb_samples = 0;
int max_out_nb_samples = 0;
uint8_t **resampled_data = NULL;
int resampled_data_size = 0;
swr_ctx = swr_alloc();
if (!swr_ctx) {
printf("swr_alloc error\n");
return -1;
}
in_channel_layout = (audio_decode_ctx->channels ==
av_get_channel_layout_nb_channels(audio_decode_ctx->channel_layout)) ?
audio_decode_ctx->channel_layout :
av_get_default_channel_layout(audio_decode_ctx->channels);
if (in_channel_layout <=0) {
printf("in_channel_layout error\n");
return -1;
}
if (out_channels == 1) {
out_channel_layout = AV_CH_LAYOUT_MONO;
} else if (out_channels == 2) {
out_channel_layout = AV_CH_LAYOUT_STEREO;
} else {
out_channel_layout = AV_CH_LAYOUT_SURROUND;
}
in_nb_samples = audio_decode_frame->nb_samples;
if (in_nb_samples <=0) {
printf("in_nb_samples error\n");
return -1;
}
av_opt_set_int(swr_ctx, "in_channel_layout", in_channel_layout, 0);
av_opt_set_int(swr_ctx, "in_sample_rate", audio_decode_ctx->sample_rate, 0);
av_opt_set_sample_fmt(swr_ctx, "in_sample_fmt", audio_decode_ctx->sample_fmt, 0);
av_opt_set_int(swr_ctx, "out_channel_layout", out_channel_layout, 0);
av_opt_set_int(swr_ctx, "out_sample_rate", out_sample_rate, 0);
av_opt_set_sample_fmt(swr_ctx, "out_sample_fmt", out_sample_fmt, 0);
if ((ret = swr_init(swr_ctx)) < 0) {
printf("Failed to initialize the resampling context\n");
return -1;
}
max_out_nb_samples = out_nb_samples = av_rescale_rnd(in_nb_samples,
out_sample_rate,
audio_decode_ctx->sample_rate,
AV_ROUND_UP);
if (max_out_nb_samples <= 0) {
printf("av_rescale_rnd error\n");
return -1;
}
out_nb_channels = av_get_channel_layout_nb_channels(out_channel_layout);
ret = av_samples_alloc_array_and_samples(&resampled_data, &out_linesize, out_nb_channels, out_nb_samples, out_sample_fmt, 0);
if (ret < 0) {
printf("av_samples_alloc_array_and_samples error\n");
return -1;
}
out_nb_samples = av_rescale_rnd(swr_get_delay(swr_ctx, audio_decode_ctx->sample_rate) + in_nb_samples,
out_sample_rate, audio_decode_ctx->sample_rate, AV_ROUND_UP);
if (out_nb_samples <= 0) {
printf("av_rescale_rnd error\n");
return -1;
}
if (out_nb_samples > max_out_nb_samples) {
av_free(resampled_data[0]);
ret = av_samples_alloc(resampled_data, &out_linesize, out_nb_channels, out_nb_samples, out_sample_fmt, 1);
max_out_nb_samples = out_nb_samples;
}
if (swr_ctx) {
ret = swr_convert(swr_ctx, resampled_data, out_nb_samples,
(const uint8_t **)audio_decode_frame->data, audio_decode_frame->nb_samples);
if (ret < 0) {
printf("swr_convert_error\n");
return -1;
}
resampled_data_size = av_samples_get_buffer_size(&out_linesize, out_nb_channels, ret, out_sample_fmt, 1);
if (resampled_data_size < 0) {
printf("av_samples_get_buffer_size error\n");
return -1;
}
} else {
printf("swr_ctx null error\n");
return -1;
}
memcpy(out_buf, resampled_data[0], resampled_data_size);
if (resampled_data) {
av_freep(&resampled_data[0]);
}
av_freep(&resampled_data);
resampled_data = NULL;
if (swr_ctx) {
swr_free(&swr_ctx);
}
return resampled_data_size;
}
int audio_decode_frame(VideoState *is, uint8_t *audio_buf, int buf_size) {
int len1, data_size = 0;
AVPacket *pkt = &is->audio_pkt;
for(;;) {
while(is->audio_pkt_size > 0) {
int got_frame = 0;
len1 = avcodec_decode_audio4(is->audio_ctx, &is->audio_frame, &got_frame, pkt);
if(len1 < 0) {
/* if error, skip frame */
is->audio_pkt_size = 0;
break;
}
data_size = 0;
if(got_frame) {
data_size = audio_resampling(is->audio_ctx, &is->audio_frame, AV_SAMPLE_FMT_S16, is->audio_frame.channels, is->audio_frame.sample_rate, audio_buf);
assert(data_size <= buf_size);
/* data_size = av_samples_get_buffer_size(NULL, */
/* is->audio_ctx->channels, */
/* is->audio_frame.nb_samples, */
/* is->audio_ctx->sample_fmt, */
/* 1); */
/* assert(data_size <= buf_size); */
/* memcpy(audio_buf, is->audio_frame.data[0], data_size); */
}
is->audio_pkt_data += len1;
is->audio_pkt_size -= len1;
if(data_size <= 0) {
/* No data yet, get more frames */
continue;
}
/* We have data, return it and come back for more later */
return data_size;
}
if(pkt->data)
av_free_packet(pkt);
if(is->quit) {
return -1;
}
/* next packet */
if(packet_queue_get(&is->audioq, pkt, 1) < 0) {
return -1;
}
is->audio_pkt_data = pkt->data;
is->audio_pkt_size = pkt->size;
}
}
void audio_callback(void *userdata, Uint8 *stream, int len) {
VideoState *is = (VideoState *)userdata;
int len1, audio_size;
while(len > 0) {
if(is->audio_buf_index >= is->audio_buf_size) {
/* We have already sent all our data; get more */
audio_size = audio_decode_frame(is, is->audio_buf, sizeof(is->audio_buf));
if(audio_size < 0) {
/* If error, output silence */
is->audio_buf_size = 1024;
memset(is->audio_buf, 0, is->audio_buf_size);
} else {
is->audio_buf_size = audio_size;
}
is->audio_buf_index = 0;
}
len1 = is->audio_buf_size - is->audio_buf_index;
if(len1 > len)
len1 = len;
memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1);
len -= len1;
stream += len1;
is->audio_buf_index += len1;
}
}
static Uint32 sdl_refresh_timer_cb(Uint32 interval, void *opaque) {
SDL_Event event;
event.type = FF_REFRESH_EVENT;
event.user.data1 = opaque;
SDL_PushEvent(&event);
return 0; /* 0 means stop timer */
}
/* schedule a video refresh in 'delay' ms */
static void schedule_refresh(VideoState *is, int delay) {
SDL_AddTimer(delay, sdl_refresh_timer_cb, is);
}
void video_display(VideoState *is) {
SDL_Rect rect;
VideoPicture *vp;
float aspect_ratio;
int w, h, x, y;
int i;
vp = &is->pictq[is->pictq_rindex];
/* if(vp->bmp) { */
if(vp->texture) {
if(is->video_ctx->sample_aspect_ratio.num == 0) {
aspect_ratio = 0;
} else {
aspect_ratio = av_q2d(is->video_ctx->sample_aspect_ratio) *
is->video_ctx->width / is->video_ctx->height;
}
if(aspect_ratio <= 0.0) {
aspect_ratio = (float)is->video_ctx->width /
(float)is->video_ctx->height;
}
/* h = screen->h; */
/* w = ((int)rint(h * aspect_ratio)) & -3; */
/* if(w > screen->w) { */
/* w = screen->w; */
/* h = ((int)rint(w / aspect_ratio)) & -3; */
/* } */
/* x = (screen->w - w) / 2; */
/* y = (screen->h - h) / 2; */
/* rect.x = x; */
/* rect.y = y; */
/* rect.w = w; */
/* rect.h = h; */
SDL_LockMutex(screen_mutex);
/* SDL_DisplayYUVOverlay(vp->bmp, &rect); */
SDL_UpdateYUVTexture(
vp->texture,
NULL,
vp->yPlane,
is->video_ctx->width,
vp->uPlane,
vp->uvPitch,
vp->vPlane,
vp->uvPitch
);
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, vp->texture, NULL, NULL);
SDL_RenderPresent(renderer);
SDL_UnlockMutex(screen_mutex);
}
}
void video_refresh_timer(void *userdata) {
VideoState *is = (VideoState *)userdata;
VideoPicture *vp;
if(is->video_st) {
if(is->pictq_size == 0) {
schedule_refresh(is, 1);
} else {
vp = &is->pictq[is->pictq_rindex];
/* Now, normally here goes a ton of code
about timing, etc. we're just going to
guess at a delay for now. You can
increase and decrease this value and hard code
the timing - but I don't suggest that ;)
We'll learn how to do it for real later.
*/
schedule_refresh(is, 40);
/* show the picture! */
video_display(is);
/* update queue for next picture! */
if(++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE) {
is->pictq_rindex = 0;
}
SDL_LockMutex(is->pictq_mutex);
is->pictq_size--;
SDL_CondSignal(is->pictq_cond);
SDL_UnlockMutex(is->pictq_mutex);
}
} else {
schedule_refresh(is, 100);
}
}
void alloc_picture(void *userdata) {
VideoState *is = (VideoState *)userdata;
VideoPicture *vp;
float aspect_ratio;
int w, h, x, y;
int scr_w, scr_h;
int i;
vp = &is->pictq[is->pictq_windex];
if(vp->texture) {
// we already have one make another, bigger/smaller
/* SDL_FreeYUVOverlay(vp->bmp); */
SDL_DestroyTexture(vp->texture);
}
// Allocate a place to put our YUV image on that screen
SDL_LockMutex(screen_mutex);
if(is->video_ctx->sample_aspect_ratio.num == 0) {
aspect_ratio = 0;
} else {
aspect_ratio = av_q2d(is->video_ctx->sample_aspect_ratio) *
is->video_ctx->width / is->video_ctx->height;
}
if(aspect_ratio <= 0.0) {
aspect_ratio = (float)is->video_ctx->width /
(float)is->video_ctx->height;
}
SDL_GetWindowSize(screen, &scr_w, &scr_h);
h = scr_h;
w = ((int)rint(h * aspect_ratio)) & -3;
if(w > scr_w) {
w = scr_w;
h = ((int)rint(w / aspect_ratio)) & -3;
}
x = (scr_w - w) / 2;
y = (scr_h - h) / 2;
printf("screen final size: %dx%d\n", w, h);
vp->texture = SDL_CreateTexture(
renderer,
SDL_PIXELFORMAT_YV12,
SDL_TEXTUREACCESS_STREAMING,
/* is->video_ctx->width, */
w,
/* is->video_ctx->height */
h
);
vp->yPlaneSz = w * h;
/* vp->yPlaneSz = is->video_ctx->width * is->video_ctx->height; */
vp->uvPlaneSz = w * h / 4;
/* vp->uvPlaneSz = is->video_ctx->width * is->video_ctx->height / 4; */
vp->yPlane = (Uint8*)malloc(vp->yPlaneSz);
vp->uPlane = (Uint8*)malloc(vp->uvPlaneSz);
vp->vPlane = (Uint8*)malloc(vp->uvPlaneSz);
if (!vp->yPlane || !vp->uPlane || !vp->vPlane) {
fprintf(stderr, "Could not allocate pixel buffers - exiting\n");
exit(1);
}
vp->uvPitch = is->video_ctx->width / 2;
/* vp->bmp = SDL_CreateYUVOverlay(is->video_ctx->width, */
/* is->video_ctx->height, */
/* SDL_YV12_OVERLAY, */
/* screen); */
SDL_UnlockMutex(screen_mutex);
vp->width = is->video_ctx->width;
vp->height = is->video_ctx->height;
vp->allocated = 1;
}
int queue_picture(VideoState *is, AVFrame *pFrame) {
VideoPicture *vp;
int dst_pix_fmt;
AVPicture pict;
/* wait until we have space for a new pic */
SDL_LockMutex(is->pictq_mutex);
while(is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE &&
!is->quit) {
SDL_CondWait(is->pictq_cond, is->pictq_mutex);
}
SDL_UnlockMutex(is->pictq_mutex);
if(is->quit)
return -1;
// windex is set to 0 initially
vp = &is->pictq[is->pictq_windex];
/* allocate or resize the buffer! */
if(!vp->texture||
vp->width != is->video_ctx->width ||
vp->height != is->video_ctx->height) {
SDL_Event event;
vp->allocated = 0;
alloc_picture(is);
if(is->quit) {
return -1;
}
}
/* We have a place to put our picture on the queue */
/* if(vp->bmp) { */
if(vp->texture) {
/* SDL_LockYUVOverlay(vp->bmp); */
dst_pix_fmt = AV_PIX_FMT_YUV420P;
/* point pict at the queue */
pict.data[0] = vp->yPlane;
pict.data[1] = vp->uPlane;
pict.data[2] = vp->vPlane;
pict.linesize[0] = vp->width;
pict.linesize[1] = vp->uvPitch;
pict.linesize[2] = vp->uvPitch;
// Convert the image into YUV format that SDL uses
sws_scale(is->sws_ctx, (uint8_t const * const *)pFrame->data,
pFrame->linesize, 0, is->video_ctx->height,
pict.data, pict.linesize);
/* SDL_UnlockYUVOverlay(vp->bmp); */
/* now we inform our display thread that we have a pic ready */
if(++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE) {
is->pictq_windex = 0;
}
SDL_LockMutex(is->pictq_mutex);
is->pictq_size++;
SDL_UnlockMutex(is->pictq_mutex);
}
return 0;
}
int video_thread(void *arg) {
VideoState *is = (VideoState *)arg;
AVPacket pkt1, *packet = &pkt1;
int frameFinished;
AVFrame *pFrame;
pFrame = av_frame_alloc();
for(;;) {
if(packet_queue_get(&is->videoq, packet, 1) < 0) {
// means we quit getting packets
break;
}
// Decode video frame
avcodec_decode_video2(is->video_ctx, pFrame, &frameFinished, packet);
// Did we get a video frame?
if(frameFinished) {
if(queue_picture(is, pFrame) < 0) {
break;
}
}
av_free_packet(packet);
}
av_frame_free(&pFrame);
return 0;
}
int stream_component_open(VideoState *is, int stream_index) {
AVFormatContext *pFormatCtx = is->pFormatCtx;
AVCodecContext *codecCtx = NULL;
AVCodec *codec = NULL;
SDL_AudioSpec wanted_spec, spec;
if(stream_index < 0 || stream_index >= pFormatCtx->nb_streams) {
return -1;
}
codec = avcodec_find_decoder(pFormatCtx->streams[stream_index]->codec->codec_id);
if(!codec) {
fprintf(stderr, "Unsupported codec!\n");
return -1;
}
codecCtx = avcodec_alloc_context3(codec);
if(avcodec_copy_context(codecCtx, pFormatCtx->streams[stream_index]->codec) != 0) {
fprintf(stderr, "Couldn't copy codec context");
return -1; // Error copying codec context
}
if (codecCtx->codec_type == AVMEDIA_TYPE_VIDEO) {
SDL_SetWindowSize(screen, codecCtx->width, codecCtx->height);
/* screen = SDL_CreateWindow( */
/* "FFmpeg Tutorial", */
/* SDL_WINDOWPOS_UNDEFINED, */
/* SDL_WINDOWPOS_UNDEFINED, */
/* [> 1280, <] */
/* [> 640, <] */
/* [> 1280, <] */
/* codecCtx->width, */
/* [> pCodecCtx->width, <] */
/* [> 800, <] */
/* [> 480, <] */
/* [> 900, <] */
/* codecCtx->height, */
/* [> pCodecCtx->height, <] */
/* 0 */
/* ); */
/* if(!screen) { */
/* fprintf(stderr, "SDL: could not set video mode - exiting\n"); */
/* exit(1); */
/* } */
/* renderer = SDL_CreateRenderer(screen, -1, 0); */
/* if (!renderer) { */
/* fprintf(stderr, "SDL: could not create renderer - exiting\n"); */
/* exit(1); */
/* } */
}
if(codecCtx->codec_type == AVMEDIA_TYPE_AUDIO) {
// Set audio settings from codec info
wanted_spec.freq = codecCtx->sample_rate;
wanted_spec.format = AUDIO_S16SYS;
wanted_spec.channels = codecCtx->channels;
wanted_spec.silence = 0;
wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
wanted_spec.callback = audio_callback;
wanted_spec.userdata = is;
if(SDL_OpenAudio(&wanted_spec, &spec) < 0) {
fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError());
return -1;
}
}
if(avcodec_open2(codecCtx, codec, NULL) < 0) {
fprintf(stderr, "Unsupported codec!\n");
return -1;
}
switch(codecCtx->codec_type) {
case AVMEDIA_TYPE_AUDIO:
is->audioStream = stream_index;
is->audio_st = pFormatCtx->streams[stream_index];
is->audio_ctx = codecCtx;
is->audio_buf_size = 0;
is->audio_buf_index = 0;
memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));
packet_queue_init(&is->audioq);
SDL_PauseAudio(0);
break;
case AVMEDIA_TYPE_VIDEO:
is->videoStream = stream_index;
is->video_st = pFormatCtx->streams[stream_index];
is->video_ctx = codecCtx;
packet_queue_init(&is->videoq);
is->video_tid = SDL_CreateThread(video_thread, "video_thread", is);
is->sws_ctx = sws_getContext(is->video_ctx->width, is->video_ctx->height,
is->video_ctx->pix_fmt, is->video_ctx->width,
is->video_ctx->height, AV_PIX_FMT_YUV420P,
SWS_BILINEAR, NULL, NULL, NULL
);
break;
default:
break;
}
}
int decode_thread(void *arg) {
VideoState *is = (VideoState *)arg;
AVFormatContext *pFormatCtx = NULL;
AVPacket pkt1, *packet = &pkt1;
int video_index = -1;
int audio_index = -1;
int i;
is->videoStream=-1;
is->audioStream=-1;
global_video_state = is;
// Open video file
printf("here!!decode_thread\n");
printf("is->filename: %s\n", is->filename);
if(avformat_open_input(&pFormatCtx, is->filename, NULL, NULL)!=0) {
printf("avformat_open_input Failed: %s\n", is->filename);
return -1; // Couldn't open file
}
is->pFormatCtx = pFormatCtx;
// Retrieve stream information
if(avformat_find_stream_info(pFormatCtx, NULL)<0)
return -1; // Couldn't find stream information
// Dump information about file onto standard error
av_dump_format(pFormatCtx, 0, is->filename, 0);
// Find the first video stream
for(i=0; i<pFormatCtx->nb_streams; i++) {
if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO &&
video_index < 0) {
video_index=i;
}
if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO &&
audio_index < 0) {
audio_index=i;
}
}
if(audio_index >= 0) {
stream_component_open(is, audio_index);
}
if(video_index >= 0) {
stream_component_open(is, video_index);
}
if(is->videoStream < 0 || is->audioStream < 0) {
fprintf(stderr, "%s: could not open codecs\n", is->filename);
goto fail;
}
// main decode loop
for(;;) {
if(is->quit) {
break;
}
// seek stuff goes here
if(is->audioq.size > MAX_AUDIOQ_SIZE ||
is->videoq.size > MAX_VIDEOQ_SIZE) {
SDL_Delay(10);
continue;
}
if(av_read_frame(is->pFormatCtx, packet) < 0) {
if(is->pFormatCtx->pb->error == 0) {
SDL_Delay(100); /* no error; wait for user input */
continue;
} else {
break;
}
}
// Is this a packet from the video stream?
if(packet->stream_index == is->videoStream) {
packet_queue_put(&is->videoq, packet);
} else if(packet->stream_index == is->audioStream) {
packet_queue_put(&is->audioq, packet);
} else {
av_free_packet(packet);
}
}
/* all done - wait for it */
while(!is->quit) {
SDL_Delay(100);
}
fail:
if(1){
SDL_Event event;
event.type = FF_QUIT_EVENT;
event.user.data1 = is;
SDL_PushEvent(&event);
}
return 0;
}
int main(int argc, char *argv[]) {
SDL_Event event;
VideoState *is;
is = av_mallocz(sizeof(VideoState));
if(argc < 2) {
fprintf(stderr, "Usage: test <file>\n");
/* exit(1); */
}
// Register all formats and codecs
av_register_all();
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
exit(1);
}
// Make a screen to put our video
//
/* #ifndef __DARWIN__ */
/* screen = SDL_SetVideoMode(640, 480, 0, 0); */
/* #else */
/* screen = SDL_SetVideoMode(640, 480, 24, 0); */
/* #endif */
screen = SDL_CreateWindow(
"FFmpeg Tutorial",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
/* 1280, */
/* 640, */
1280,
/* pCodecCtx->width, */
/* 800, */
/* 480, */
800,
/* pCodecCtx->height, */
0
);
if(!screen) {
fprintf(stderr, "SDL: could not set video mode - exiting\n");
exit(1);
}
renderer = SDL_CreateRenderer(screen, -1, 0);
if (!renderer) {
fprintf(stderr, "SDL: could not create renderer - exiting\n");
exit(1);
}
screen_mutex = SDL_CreateMutex();
/* av_strlcpy(is->filename, argv[1], sizeof(is->filename)); */
av_strlcpy(is->filename, "a.mp4", sizeof(is->filename));
printf("is->filename: %s\n", is->filename);
is->pictq_mutex = SDL_CreateMutex();
is->pictq_cond = SDL_CreateCond();
schedule_refresh(is, 40);
is->parse_tid = SDL_CreateThread(decode_thread, "decode_thread", is);
if(!is->parse_tid) {
av_free(is);
return -1;
}
for(;;) {
SDL_WaitEvent(&event);
switch(event.type) {
case FF_QUIT_EVENT:
case SDL_QUIT:
is->quit = 1;
/* SDL_DestroyTexture(texture); */
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(screen);
SDL_Quit();
return 0;
break;
case FF_REFRESH_EVENT:
video_refresh_timer(event.user.data1);
break;
default:
break;
}
}
return 0;
}
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