avcodec confusion

1 files changed, 554 insertions, 0 deletions

diff --git a/rotord/libavexporter.h b/rotord/libavexporter.h
new file mode 100644
index 0000000..27bbbe5
--- /dev/null
+++ b/rotord/libavexporter.h
@@ -0,0 +1,554 @@
+/*
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+*/
+
+/*
+ * @file
+ * libavformat API example.
+ *
+ * Output a media file in any supported libavformat format.
+ * The default codecs are used.
+ * @example doc/examples/muxing.c
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string>
+#include <math.h>
+#include <iostream>
+
+extern "C" {
+    #include <libavutil/mathematics.h>
+    #include <libavformat/avformat.h>
+    #include <libswscale/swscale.h>
+}
+
+// 5 seconds stream duration //
+#define STREAM_DURATION   200.0
+#define STREAM_FRAME_RATE 25 // 25 images/s //
+#define STREAM_NB_FRAMES  ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
+#define STREAM_PIX_FMT    AV_PIX_FMT_YUV420P // default pix_fmt //
+
+namespace libav {
+
+
+    static int sws_flags = SWS_BICUBIC;
+
+    //************************************************************//
+    // audio output //
+
+    static float t, tincr, tincr2;
+    static int audio_input_frame_size;
+
+    // Add an output stream. //
+    static AVStream *add_stream(AVFormatContext *oc, AVCodec **codec,
+                                enum AVCodecID codec_id)
+    {
+        AVCodecContext *c;
+        AVStream *st;
+
+        // find the encoder //
+        *codec = avcodec_find_encoder(codec_id);
+        if (!(*codec)) {
+            //fprintf(stderr, "Could not find encoder for '%s'\n",
+            //        avcodec_get_name(codec_id));
+            exit(1);
+        }
+
+        st = avformat_new_stream(oc, *codec);
+        if (!st) {
+            //fprintf(stderr, "Could not allocate stream\n");
+            exit(1);
+        }
+        st->id = oc->nb_streams-1;
+        c = st->codec;
+
+        switch ((*codec)->type) {
+        case AVMEDIA_TYPE_AUDIO:
+            st->id = 1;
+            c->sample_fmt  = AV_SAMPLE_FMT_S16;
+            c->bit_rate    = 64000;
+            c->sample_rate = 44100;
+            c->channels    = 2;
+            c->channel_layout=AV_CH_LAYOUT_STEREO;
+            break;
+
+        case AVMEDIA_TYPE_VIDEO:
+            c->codec_id = codec_id;
+
+            c->bit_rate = 400000;
+            // Resolution must be a multiple of two. //
+            c->width    = 352;
+            c->height   = 288;
+            // timebase: This is the fundamental unit of time (in seconds) in terms
+            // * of which frame timestamps are represented. For fixed-fps content,
+            // * timebase should be 1/framerate and timestamp increments should be
+            // * identical to 1. //
+            c->time_base.den = STREAM_FRAME_RATE;
+            c->time_base.num = 1;
+            c->gop_size      = 12; // emit one intra frame every twelve frames at most //
+            c->pix_fmt       = STREAM_PIX_FMT;
+            if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
+                // just for testing, we also add B frames //
+                c->max_b_frames = 2;
+            }
+            if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
+                // Needed to avoid using macroblocks in which some coeffs overflow.
+                // * This does not happen with normal video, it just happens here as
+                // * the motion of the chroma plane does not match the luma plane. //
+                c->mb_decision = 2;
+            }
+        break;
+
+        default:
+            break;
+        }
+
+        // Some formats want stream headers to be separate. //
+        if (oc->oformat->flags & AVFMT_GLOBALHEADER)
+            c->flags |= CODEC_FLAG_GLOBAL_HEADER;
+
+        return st;
+    }
+
+    //************************************************************//
+    // audio output //
+
+
+    static void open_audio(AVFormatContext *oc, AVCodec *codec, AVStream *st)
+    {
+        AVCodecContext *c;
+        int ret;
+
+        c = st->codec;
+
+        // open it //
+        ret = avcodec_open2(c, codec, NULL);
+        if (ret < 0) {
+            //fprintf(stderr, "Could not open audio codec: %s\n", av_err2str(ret));
+            exit(1);
+        }
+
+        // init signal generator //
+        t     = 0;
+        tincr = 2 * M_PI * 110.0 / c->sample_rate;
+        // increment frequency by 110 Hz per second //
+        tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
+
+        if (c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)
+            audio_input_frame_size = 10000;
+        else
+            audio_input_frame_size = c->frame_size;
+
+        /*
+        samples = av_malloc(audio_input_frame_size *
+                            av_get_bytes_per_sample(c->sample_fmt) *
+                            c->channels);
+        if (!samples) {
+            //fprintf(stderr, "Could not allocate audio samples buffer\n");
+            exit(1);
+        }
+        */
+    }
+
+    // Prepare a 16 bit dummy audio frame of 'frame_size' samples and
+    // * 'nb_channels' channels. //
+    static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
+    {
+        int j, i, v;
+        int16_t *q;
+
+        q = samples;
+        for (j = 0; j < frame_size; j++) {
+            v = (int)(sin(t) * 10000);
+            for (i = 0; i < nb_channels; i++)
+                *q++ = v;
+            t     += tincr;
+            tincr += tincr2;
+        }
+    }
+
+    static void write_audio_frame(AVFormatContext *oc, AVStream *st,uint16_t *samples)
+    {
+        AVCodecContext *c;
+        AVPacket pkt = { 0 }; // data and size must be 0;
+        AVFrame *frame = avcodec_alloc_frame();
+        int got_packet, ret;
+
+        av_init_packet(&pkt);
+        c = st->codec;
+
+        //get_audio_frame(samples, audio_input_frame_size, c->channels);
+        frame->nb_samples = audio_input_frame_size;
+        avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt,
+                                 (uint8_t *)samples,
+                                 audio_input_frame_size *
+                                 av_get_bytes_per_sample(c->sample_fmt) *
+                                 c->channels, 1);
+
+        ret = avcodec_encode_audio2(c, &pkt, frame, &got_packet);
+        if (ret < 0) {
+            //fprintf(stderr, "Error encoding audio frame: %s\n", av_err2str(ret));
+            exit(1);
+        }
+
+        if (!got_packet)
+            return;
+
+        pkt.stream_index = st->index;
+
+        // Write the compressed frame to the media file. //
+        ret = av_interleaved_write_frame(oc, &pkt);
+        if (ret != 0) {
+            //fprintf(stderr, "Error while writing audio frame: %s\n",
+            //        av_err2str(ret));
+            exit(1);
+        }
+        avcodec_free_frame(&frame);
+    }
+
+    static void close_audio(AVFormatContext *oc, AVStream *st)
+    {
+        avcodec_close(st->codec);
+
+        
+    }
+
+    //************************************************************//
+    // video output //
+
+    static AVFrame *frame;
+    static AVPicture src_picture, dst_picture;
+    static int frame_count;
+    static uint8_t *outPixels;
+
+    static void open_video(AVFormatContext *oc, AVCodec *codec, AVStream *st)
+    {
+        int ret;
+        AVCodecContext *c = st->codec;
+
+        // open the codec //
+        ret = avcodec_open2(c, codec, NULL);
+        if (ret < 0) {
+            //fprintf(stderr, "Could not open video codec: %s\n", av_err2str(ret));
+            exit(1);
+        }
+
+        // allocate and init a re-usable frame //
+        frame = avcodec_alloc_frame();
+        if (!frame) {
+            //fprintf(stderr, "Could not allocate video frame\n");
+            exit(1);
+        }
+
+        // Allocate the encoded raw picture. //
+        ret = avpicture_alloc(&dst_picture, c->pix_fmt, c->width, c->height);
+        if (ret < 0) {
+            //fprintf(stderr, "Could not allocate picture: %s\n", av_err2str(ret));
+            exit(1);
+        }
+
+        // If the output format is not YUV420P, then a temporary YUV420P
+        // * picture is needed too. It is then converted to the required
+        // * output format. //
+        if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
+            ret = avpicture_alloc(&src_picture, AV_PIX_FMT_YUV420P, c->width, c->height);
+            if (ret < 0) {
+                //fprintf(stderr, "Could not allocate temporary picture: %s\n",
+                //        av_err2str(ret));
+                exit(1);
+            }
+        }
+
+        // copy data and linesize picture pointers to frame //
+        *((AVPicture *)frame) = dst_picture;
+
+        outPixels = (uint8_t*)av_malloc(avpicture_get_size(PIX_FMT_YUV420P, st->codec->width,st->codec->height));
+    }
+
+    // Prepare a dummy image. //
+    static void fill_yuv_image(AVPicture *pict, int frame_index,
+                               int width, int height)
+    {
+        int x, y, i;
+
+        i = frame_index;
+
+        // Y //
+        for (y = 0; y < height; y++)
+            for (x = 0; x < width; x++)
+                pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
+
+        // Cb and Cr //
+        for (y = 0; y < height / 2; y++) {
+            for (x = 0; x < width / 2; x++) {
+                pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
+                pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
+            }
+        }
+    }
+
+    static void write_video_frame(AVFormatContext *oc, AVStream *st, uint8_t *pixels)
+    {
+        int ret;
+        static struct SwsContext *sws_ctx;
+        AVCodecContext *c = st->codec;
+
+/*
+        if (frame_count >= STREAM_NB_FRAMES) {
+            // No more frames to compress. The codec has a latency of a few
+            // * frames if using B-frames, so we get the last frames by
+            // * passing the same picture again. //
+        } else {
+            if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
+                // as we only generate a YUV420P picture, we must convert it
+                // * to the codec pixel format if needed //
+                if (!sws_ctx) {
+                    sws_ctx = sws_getContext(c->width, c->height, AV_PIX_FMT_YUV420P,
+                                             c->width, c->height, c->pix_fmt,
+                                             sws_flags, NULL, NULL, NULL);
+                    if (!sws_ctx) {
+                        //fprintf(stderr,
+                        //        "Could not initialize the conversion context\n");
+                        exit(1);
+                    }
+                }
+                fill_yuv_image(&src_picture, frame_count, c->width, c->height);
+                sws_scale(sws_ctx,
+                          (const uint8_t * const *)src_picture.data, src_picture.linesize,
+                          0, c->height, dst_picture.data, dst_picture.linesize);
+            } else {
+                fill_yuv_image(&dst_picture, frame_count, c->width, c->height);
+            }
+        }
+*/
+        //always convert RGB to YUV
+        sws_ctx = sws_getContext(c->width, c->height, AV_PIX_FMT_RGB24,
+                                             c->width, c->height, AV_PIX_FMT_YUV420P,
+                                             sws_flags, NULL, NULL, NULL);
+
+        avpicture_fill(&src_picture, pixels, PIX_FMT_RGB24, c->width,c->height);
+        avpicture_fill(&dst_picture, outPixels, PIX_FMT_YUV420P, c->width,c->height);
+
+        sws_scale(sws_ctx, src_picture.data, src_picture.linesize, 0, c->height, dst_picture.data, dst_picture.linesize);
+
+        if (oc->oformat->flags & AVFMT_RAWPICTURE) {
+            // Raw video case - directly store the picture in the packet //
+            AVPacket pkt;
+            av_init_packet(&pkt);
+
+            pkt.flags        |= AV_PKT_FLAG_KEY;
+            pkt.stream_index  = st->index;
+            pkt.data          = dst_picture.data[0];
+            pkt.size          = sizeof(AVPicture);
+
+            ret = av_interleaved_write_frame(oc, &pkt);
+        } else {
+            AVPacket pkt = { 0 };
+            int got_packet;
+            av_init_packet(&pkt);
+
+            // encode the image //
+            ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
+            if (ret < 0) {
+                //fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
+                exit(1);
+            }
+            // If size is zero, it means the image was buffered. //
+
+            if (!ret && got_packet && pkt.size) {
+                pkt.stream_index = st->index;
+
+                // Write the compressed frame to the media file. //
+                ret = av_interleaved_write_frame(oc, &pkt);
+            } else {
+                ret = 0;
+            }
+        }
+        if (ret != 0) {
+            //fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));
+            exit(1);
+        }
+        frame_count++;
+    }
+
+    static void close_video(AVFormatContext *oc, AVStream *st)
+    {
+        avcodec_close(st->codec);
+        av_free(src_picture.data[0]);
+        av_free(dst_picture.data[0]);
+        av_free(frame);
+        av_free(outPixels);
+    }
+
+    class exporter {
+        public:
+            bool setup(int w,int h, int bitRate, int frameRate, std::string container);
+            bool record(std::string filename);
+            bool encodeFrame(unsigned char *pixels);
+            void finishRecord();
+        private:
+            AVOutputFormat *fmt;
+            AVFormatContext *oc;
+            AVStream *audio_st, *video_st;
+            AVCodec *audio_codec, *video_codec;
+            double audio_pts, video_pts;
+
+            int w;
+            int h;
+            int bitRate;
+            int frameRate;
+            std::string container;
+
+            int outputframe;
+    };
+
+    //************************************************************//
+    // media file output //
+
+/*
+    int main(int argc, char **argv)
+    {
+        const char *filename;
+        AVOutputFormat *fmt;
+        AVFormatContext *oc;
+        AVStream *audio_st, *video_st;
+        AVCodec *audio_codec, *video_codec;
+        double audio_pts, video_pts;
+        int ret;
+
+        // Initialize libavcodec, and register all codecs and formats. //
+        av_register_all();
+
+        if (argc != 2) {
+            printf("usage: %s output_file\n"
+                   "API example program to output a media file with libavformat.\n"
+                   "This program generates a synthetic audio and video stream, encodes and\n"
+                   "muxes them into a file named output_file.\n"
+                   "The output format is automatically guessed according to the file extension.\n"
+                   "Raw images can also be output by using '%%d' in the filename.\n"
+                   "\n", argv[0]);
+            return 1;
+        }
+
+        filename = argv[1];
+
+        // allocate the output media context //
+        avformat_alloc_output_context2(&oc, NULL, NULL, filename);
+        if (!oc) {
+            printf("Could not deduce output format from file extension: using MPEG.\n");
+            avformat_alloc_output_context2(&oc, NULL, "mpeg", filename);
+        }
+        if (!oc) {
+            return 1;
+        }
+        fmt = oc->oformat;
+
+        // Add the audio and video streams using the default format codecs
+        // * and initialize the codecs. //
+        video_st = NULL;
+        audio_st = NULL;
+
+        if (fmt->video_codec != AV_CODEC_ID_NONE) {
+            video_st = add_stream(oc, &video_codec, fmt->video_codec);
+        }
+        if (fmt->audio_codec != AV_CODEC_ID_NONE) {
+            audio_st = add_stream(oc, &audio_codec, fmt->audio_codec);
+        }
+
+        // Now that all the parameters are set, we can open the audio and
+         * video codecs and allocate the necessary encode buffers. //
+        if (video_st)
+            open_video(oc, video_codec, video_st);
+        if (audio_st)
+            open_audio(oc, audio_codec, audio_st);
+
+        av_dump_format(oc, 0, filename, 1);
+
+        // open the output file, if needed //
+        if (!(fmt->flags & AVFMT_NOFILE)) {
+            ret = avio_open(&oc->pb, filename, AVIO_FLAG_WRITE);
+            if (ret < 0) {
+                fprintf(stderr, "Could not open '%s': %s\n", filename,
+                        av_err2str(ret));
+                return 1;
+            }
+        }
+
+        // Write the stream header, if any. //
+        ret = avformat_write_header(oc, NULL);
+        if (ret < 0) {
+            fprintf(stderr, "Error occurred when opening output file: %s\n",
+                    av_err2str(ret));
+            return 1;
+        }
+
+        if (frame)
+            frame->pts = 0;
+        for (;;) {
+            // Compute current audio and video time. //
+            if (audio_st)
+                audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
+            else
+                audio_pts = 0.0;
+
+            if (video_st)
+                video_pts = (double)video_st->pts.val * video_st->time_base.num /
+                            video_st->time_base.den;
+            else
+                video_pts = 0.0;
+
+            if ((!audio_st || audio_pts >= STREAM_DURATION) &&
+                (!video_st || video_pts >= STREAM_DURATION))
+                break;
+
+            // write interleaved audio and video frames //
+            if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
+                write_audio_frame(oc, audio_st);
+            } else {
+                write_video_frame(oc, video_st);
+                frame->pts += av_rescale_q(1, video_st->codec->time_base, video_st->time_base);
+            }
+        }
+
+        // Write the trailer, if any. The trailer must be written before you
+         * close the CodecContexts open when you wrote the header; otherwise
+         * av_write_trailer() may try to use memory that was freed on
+         * av_codec_close(). //
+        av_write_trailer(oc);
+
+        // Close each codec. //
+        if (video_st)
+            close_video(oc, video_st);
+        if (audio_st)
+            close_audio(oc, audio_st);
+
+        if (!(fmt->flags & AVFMT_NOFILE))
+            // Close the output file. //
+            avio_close(oc->pb);
+
+        // free the stream //
+        avformat_free_context(oc);
+
+        return 0;
+    }
+    */
+}