275 lines
11 KiB
C++
275 lines
11 KiB
C++
#include "previewgenerator.h"
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#include "media.h"
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#include "panels/viewer.h"
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#include <QPainter>
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#include <QPixmap>
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#include <QDebug>
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#include <QtMath>
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#include <QTreeWidgetItem>
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#define WAVEFORM_RESOLUTION 64
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extern "C" {
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#include <libavformat/avformat.h>
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#include <libavcodec/avcodec.h>
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#include <libswscale/swscale.h>
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#include <libswresample/swresample.h>
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}
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PreviewGenerator::PreviewGenerator(QTreeWidgetItem* i, Media* m) : QThread(0), fmt_ctx(NULL), item(i), media(m) {
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connect(this, SIGNAL(finished()), this, SLOT(deleteLater()));
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}
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void PreviewGenerator::parse_media() {
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bool contains_still_image = false;
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// detect video/audio streams in file
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for (int i=0;i<(int)fmt_ctx->nb_streams;i++) {
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// Find the decoder for the video stream
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if (avcodec_find_decoder(fmt_ctx->streams[i]->codecpar->codec_id) == NULL) {
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qDebug() << "[ERROR] Unsupported codec in stream %d.\n";
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} else {
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MediaStream* ms = media->get_stream_from_file_index(i);
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bool append = false;
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if (ms == NULL) {
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ms = new MediaStream();
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ms->preview_done = false;
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ms->file_index = i;
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append = true;
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}
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if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
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if (fmt_ctx->streams[i]->avg_frame_rate.den == 0) { // source is LIKELY a still image
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ms->infinite_length = true;
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contains_still_image = true;
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ms->video_frame_rate = 0;
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} else {
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ms->infinite_length = false;
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ms->video_frame_rate = av_q2d(fmt_ctx->streams[i]->avg_frame_rate);
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}
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ms->video_width = fmt_ctx->streams[i]->codecpar->width;
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ms->video_height = fmt_ctx->streams[i]->codecpar->height;
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if (append) media->video_tracks.append(ms);
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} else if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
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ms->audio_channels = fmt_ctx->streams[i]->codecpar->channels;
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ms->audio_layout = fmt_ctx->streams[i]->codecpar->channel_layout;
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ms->audio_frequency = fmt_ctx->streams[i]->codecpar->sample_rate;
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if (append) media->audio_tracks.append(ms);
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} else {
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delete ms;
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}
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}
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}
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media->length = fmt_ctx->duration;
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media->ready = true;
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if (media->video_tracks.size() == 0) {
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emit set_icon(ICON_TYPE_AUDIO);
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} else {
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emit set_icon(ICON_TYPE_VIDEO);
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}
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if (!contains_still_image || media->audio_tracks.size() > 0) {
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double frame_rate = 30;
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if (!contains_still_image && media->video_tracks.size() > 0) frame_rate = media->video_tracks.at(0)->video_frame_rate;
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item->setText(1, frame_to_timecode(media->get_length_in_frames(frame_rate), TIMECODE_DROP, frame_rate));
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}
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}
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void PreviewGenerator::generate_waveform() {
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SwsContext* sws_ctx;
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SwrContext* swr_ctx;
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AVFrame* temp_frame = av_frame_alloc();
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AVCodecContext** codec_ctx = new AVCodecContext* [fmt_ctx->nb_streams];
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for (unsigned int i=0;i<fmt_ctx->nb_streams;i++) {
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codec_ctx[i] = NULL;
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if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO || fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
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AVCodec* codec = avcodec_find_decoder(fmt_ctx->streams[i]->codecpar->codec_id);
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codec_ctx[i] = avcodec_alloc_context3(codec);
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avcodec_parameters_to_context(codec_ctx[i], fmt_ctx->streams[i]->codecpar);
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avcodec_open2(codec_ctx[i], codec, NULL);
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if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && codec_ctx[i]->channel_layout == 0) {
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codec_ctx[i]->channel_layout = guess_layout_from_channels(fmt_ctx->streams[i]->codecpar->channels);
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}
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}
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}
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AVPacket packet;
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bool done = true;
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bool end_of_file = false;
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// get the ball rolling
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av_read_frame(fmt_ctx, &packet);
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avcodec_send_packet(codec_ctx[packet.stream_index], &packet);
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while (!end_of_file) {
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while (codec_ctx[packet.stream_index] == NULL || avcodec_receive_frame(codec_ctx[packet.stream_index], temp_frame) == AVERROR(EAGAIN)) {
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av_packet_unref(&packet);
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int read_ret = av_read_frame(fmt_ctx, &packet);
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if (read_ret < 0) {
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end_of_file = true;
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if (read_ret != AVERROR_EOF) qDebug() << "[ERROR] Failed to read packet for preview generation" << read_ret;
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break;
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}
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if (codec_ctx[packet.stream_index] != NULL) {
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int send_ret = avcodec_send_packet(codec_ctx[packet.stream_index], &packet);
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if (send_ret < 0 && send_ret != AVERROR(EAGAIN)) {
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qDebug() << "[ERROR] Failed to send packet for preview generation - aborting" << send_ret;
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end_of_file = true;
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break;
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}
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}
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}
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if (!end_of_file) {
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MediaStream* s = media->get_stream_from_file_index(packet.stream_index);
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if (s != NULL && !s->preview_done) {
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if (fmt_ctx->streams[packet.stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
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int dstH = 120;
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int dstW = dstH * ((float)temp_frame->width/(float)temp_frame->height);
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uint8_t* data = new uint8_t[dstW*dstH*3];
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sws_ctx = sws_getContext(
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temp_frame->width,
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temp_frame->height,
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static_cast<AVPixelFormat>(temp_frame->format),
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dstW,
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dstH,
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static_cast<AVPixelFormat>(AV_PIX_FMT_RGB24),
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SWS_FAST_BILINEAR,
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NULL,
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NULL,
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NULL
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);
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int linesize[AV_NUM_DATA_POINTERS];
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linesize[0] = dstW*3;
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sws_scale(sws_ctx, temp_frame->data, temp_frame->linesize, 0, temp_frame->height, &data, linesize);
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s->video_preview = QImage(data, dstW, dstH, linesize[0], QImage::Format_RGB888);
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// delete [] data;
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s->preview_done = true;
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sws_freeContext(sws_ctx);
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avcodec_close(codec_ctx[packet.stream_index]);
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codec_ctx[packet.stream_index] = NULL;
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} else if (fmt_ctx->streams[packet.stream_index]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
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int interval = qFloor((temp_frame->sample_rate/WAVEFORM_RESOLUTION)/4)*4;
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AVFrame* swr_frame = av_frame_alloc();
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swr_frame->channel_layout = temp_frame->channel_layout;
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swr_frame->sample_rate = temp_frame->sample_rate;
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swr_frame->format = AV_SAMPLE_FMT_S16;
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swr_ctx = swr_alloc_set_opts(
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NULL,
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temp_frame->channel_layout,
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static_cast<AVSampleFormat>(swr_frame->format),
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temp_frame->sample_rate,
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temp_frame->channel_layout,
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static_cast<AVSampleFormat>(temp_frame->format),
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temp_frame->sample_rate,
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0,
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NULL
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);
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swr_init(swr_ctx);
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swr_convert_frame(swr_ctx, swr_frame, temp_frame);
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int channel_skip = swr_frame->channels * 2;
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for (int i=0;i<swr_frame->nb_samples;i+=interval) {
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for (int j=0;j<swr_frame->channels;j++) {
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qint16 min = 0;
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qint16 max = 0;
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for (int k=j*2;k<interval;k+=channel_skip) {
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qint16 sample = ((swr_frame->data[0][i+k+1] << 8) | swr_frame->data[0][i+k]);
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if (sample > max) {
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max = sample;
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} else if (sample < min) {
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min = sample;
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}
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}
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min /= 256;
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max /= 256;
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s->audio_preview.append(min);
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s->audio_preview.append(max);
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}
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}
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swr_free(&swr_ctx);
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av_frame_free(&swr_frame);
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}
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// check if we've got all our previews
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if (media->audio_tracks.size() == 0) {
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done = true;
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for (int i=0;i<media->video_tracks.size();i++) {
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if (!media->video_tracks.at(i)->preview_done) {
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done = false;
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break;
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}
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}
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if (done) {
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end_of_file = true;
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break;
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}
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}
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}
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av_packet_unref(&packet);
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}
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}
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for (int i=0;i<media->audio_tracks.size();i++) {
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media->audio_tracks.at(i)->preview_done = true;
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}
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av_frame_free(&temp_frame);
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for (unsigned int i=0;i<fmt_ctx->nb_streams;i++) {
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if (codec_ctx[i] != NULL) {
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avcodec_close(codec_ctx[i]);
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}
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}
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delete [] codec_ctx;
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}
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void PreviewGenerator::run() {
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Q_ASSERT(media != NULL);
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Q_ASSERT(item != NULL);
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QByteArray ba = media->url.toLatin1();
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char* filename = new char[ba.size()+1];
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strcpy(filename, ba.data());
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bool error = false;
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int errCode = avformat_open_input(&fmt_ctx, filename, NULL, NULL);
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if(errCode != 0) {
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char err[1024];
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av_strerror(errCode, err, 1024);
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item->setToolTip(0, "Could not open file - " + QString(err));
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error = true;
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} else {
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errCode = avformat_find_stream_info(fmt_ctx, NULL);
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if (errCode < 0) {
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char err[1024];
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av_strerror(errCode, err, 1024);
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item->setToolTip(0, "Could not find stream information - " + QString(err));
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error = true;
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} else {
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av_dump_format(fmt_ctx, 0, filename, 0);
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parse_media();
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generate_waveform();
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}
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avformat_close_input(&fmt_ctx);
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}
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if (error) {
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emit set_icon(ICON_TYPE_ERROR);
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} else {
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item->setToolTip(0, QString());
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}
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delete [] filename;
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}
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