98 lines
3.6 KiB
C++
98 lines
3.6 KiB
C++
#include "ffutil.h"
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#include <QPainter>
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#include <QDebug>
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extern "C"{
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#include <libavformat/avformat.h>
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#include <libswscale/swscale.h>
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}
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static void imgCleanupHandler(void *info) {
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delete [] (uchar*)info;
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}
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QString videoInfo(QByteArray url, QImage &img, int64_t *dur, AVCodecID *codec_id) {
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AVFormatContext *fmt_ctx = avformat_alloc_context();
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QString err;
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{
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if(avformat_open_input(&fmt_ctx, url.constData(), 0, 0) != 0) {
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err = "Couldn't open input stream";
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goto free;
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}
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if(avformat_find_stream_info(fmt_ctx, 0) < 0) {
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err = "Couldn't find stream information";
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goto free;
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}
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if(dur) *dur = fmt_ctx->duration;
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int vi_idx = -1;
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for(uint ss=0; ss<fmt_ctx->nb_streams; ss++) if(fmt_ctx->streams[ss]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {vi_idx = ss; break;}
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if(vi_idx == -1) {
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err = "Didn't find a Video Stream";
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goto free;
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}
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auto codecpar = fmt_ctx->streams[vi_idx]->codecpar;
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if(codec_id) *codec_id = codecpar->codec_id;
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qDebug()<<"codecpar w h"<<codecpar->width<<"x"<<codecpar->height<<"codec_id"<<codecpar->codec_id<<avcodec_get_name(codecpar->codec_id);
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if(av_seek_frame(fmt_ctx, -1, 1000000, AVSEEK_FLAG_BACKWARD) < 0) {
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err = "av_seek_frame fail";
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goto free;
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}
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const AVCodec *decoder = avcodec_find_decoder(codecpar->codec_id);
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if(decoder==0) {
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err = "Could not found Video Decoder";
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goto free;
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}
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auto vcCtx = avcodec_alloc_context3(decoder);
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avcodec_parameters_to_context(vcCtx, codecpar);
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if(avcodec_open2(vcCtx, decoder, 0) < 0) {
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err = "Could not open Video Codec Ctx";
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avcodec_free_context(&vcCtx);
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goto free;
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}
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auto sws_ctx = sws_getContext(vcCtx->width, vcCtx->height, vcCtx->pix_fmt, vcCtx->width, vcCtx->height, AV_PIX_FMT_RGB32, SWS_FAST_BILINEAR, 0, 0, 0);
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auto packet = av_packet_alloc();
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auto frm = av_frame_alloc();
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int dstStride[4]{(vcCtx->width*4+63)/64*64};
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dstStride[3] = dstStride[0] * vcCtx->height;
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uint8_t *dst[4]{0};
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while(1) {
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if(av_read_frame(fmt_ctx, packet) < 0) break;
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if(packet->stream_index != vi_idx) continue;
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int res = avcodec_send_packet(vcCtx, packet);
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if(res < 0) break;
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while((res = avcodec_receive_frame(vcCtx, frm)) != AVERROR(EAGAIN)) {
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if(res < 0) goto free2;
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dst[0] = new uchar[dstStride[3]];
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sws_scale(sws_ctx, frm->data, frm->linesize, 0, vcCtx->height, dst, dstStride);
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img = QImage(dst[0], vcCtx->width, vcCtx->height, dstStride[0], QImage::Format_ARGB32, imgCleanupHandler, dst[0]);
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goto free2;
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}
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}
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free2:
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av_frame_free(&frm);
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av_packet_free(&packet);
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avcodec_free_context(&vcCtx);
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sws_freeContext(sws_ctx);
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}
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free:
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avformat_close_input(&fmt_ctx);
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return err;
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}
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QString audioInfo(QByteArray url, int64_t *dur) {
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AVFormatContext *fmt_ctx = avformat_alloc_context();
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QString err;
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{
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if(avformat_open_input(&fmt_ctx, url.constData(), nullptr, nullptr) != 0) {
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err = "Couldn't open input stream";
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goto free;
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}
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if(avformat_find_stream_info(fmt_ctx, nullptr) < 0) {
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err = "Couldn't find stream information";
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goto free;
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}
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if(dur!=nullptr) *dur = fmt_ctx->duration;
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}
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free:
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avformat_close_input(&fmt_ctx);
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return err;
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}
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