[FFmpeg-devel] [PATCH v2] examples: add flac_test
Ludmila Glinskih
lglinskih at gmail.com
Tue Apr 14 03:03:40 CEST 2015
This is a simple test for the FLAC codec.
It generates an increasing tone, encodes it, decodes it back and
compares with the original one byte-by-byte.
---
configure | 2 +
doc/Makefile | 1 +
doc/examples/Makefile | 1 +
doc/examples/flac_test.c | 295 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 299 insertions(+)
create mode 100644 doc/examples/flac_test.c
diff --git a/configure b/configure
index bc59271..5650ef8 100755
--- a/configure
+++ b/configure
@@ -1329,6 +1329,7 @@ EXAMPLE_LIST="
filter_audio_example
filtering_audio_example
filtering_video_example
+ flac_test_example
metadata_example
muxing_example
qsvdec_example
@@ -2679,6 +2680,7 @@ extract_mvs_example_deps="avcodec avformat avutil"
filter_audio_example_deps="avfilter avutil"
filtering_audio_example_deps="avfilter avcodec avformat avutil"
filtering_video_example_deps="avfilter avcodec avformat avutil"
+flac_test_example_deps="avcodec avutil"
metadata_example_deps="avformat avutil"
muxing_example_deps="avcodec avformat avutil swscale"
qsvdec_example_deps="avcodec avutil libmfx h264_qsv_decoder vaapi_x11"
diff --git a/doc/Makefile b/doc/Makefile
index 4573531..f462acc 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -45,6 +45,7 @@ DOC_EXAMPLES-$(CONFIG_EXTRACT_MVS_EXAMPLE) += extract_mvs
DOC_EXAMPLES-$(CONFIG_FILTER_AUDIO_EXAMPLE) += filter_audio
DOC_EXAMPLES-$(CONFIG_FILTERING_AUDIO_EXAMPLE) += filtering_audio
DOC_EXAMPLES-$(CONFIG_FILTERING_VIDEO_EXAMPLE) += filtering_video
+DOC_EXAMPLES-$(CONFIG_FLAC_TEST_EXAMPLE) += flac_test
DOC_EXAMPLES-$(CONFIG_METADATA_EXAMPLE) += metadata
DOC_EXAMPLES-$(CONFIG_MUXING_EXAMPLE) += muxing
DOC_EXAMPLES-$(CONFIG_QSVDEC_EXAMPLE) += qsvdec
diff --git a/doc/examples/Makefile b/doc/examples/Makefile
index 9699f11..72a2fb6 100644
--- a/doc/examples/Makefile
+++ b/doc/examples/Makefile
@@ -18,6 +18,7 @@ EXAMPLES= avio_list_dir \
extract_mvs \
filtering_video \
filtering_audio \
+ flac_test \
metadata \
muxing \
remuxing \
diff --git a/doc/examples/flac_test.c b/doc/examples/flac_test.c
new file mode 100644
index 0000000..392c50c
--- /dev/null
+++ b/doc/examples/flac_test.c
@@ -0,0 +1,295 @@
+/*
+ * Copyright (c) 2015 Ludmila Glinskih
+ * Copyright (c) 2001 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.
+ */
+
+/*
+ * FLAC codec test.
+ * Encodes raw data to FLAC format and decodes it back to raw. Compares raw-data
+ * after that.
+ */
+
+#include <libavcodec/avcodec.h>
+#include <libavutil/common.h>
+#include <libavutil/samplefmt.h>
+
+#define NUMBER_OF_FRAMES 200
+#define NAME_BUFF_SIZE 100
+
+/* generate i-th frame of test audio */
+static int generate_raw_frame(uint16_t *frame_data, int i, int sample_rate,
+ int channels, int frame_size)
+{
+ double t, tincr, tincr2;
+ int j, k;
+
+ t = 0.0;
+ tincr = 2 * M_PI * 440.0 / sample_rate;
+ tincr2 = tincr / sample_rate;
+ for (j = 0; j < frame_size; j++)
+ {
+ frame_data[channels * j] = (int)(sin(t) * 10000);
+ for (k = 1; k < channels; k++)
+ frame_data[channels * j + k] = frame_data[channels * j] * 2;
+ t = i * tincr + (i * (i + 1) / 2.0 * tincr2);
+ }
+ return 0;
+}
+
+static int init_encoder(AVCodec *enc, AVCodecContext **enc_ctx,
+ int64_t ch_layout, int sample_rate)
+{
+ AVCodecContext *ctx;
+ int result;
+ char name_buff[NAME_BUFF_SIZE];
+
+ av_get_channel_layout_string(name_buff, NAME_BUFF_SIZE, 0, ch_layout);
+ av_log(NULL, AV_LOG_INFO, "channel layout: %s, sample rate: %i\n", name_buff, sample_rate);
+
+ ctx = avcodec_alloc_context3(enc);
+ if (!ctx)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't allocate encoder context\n");
+ return AVERROR(ENOMEM);
+ }
+
+ ctx->sample_fmt = AV_SAMPLE_FMT_S16;
+ ctx->sample_rate = sample_rate;
+ ctx->channel_layout = ch_layout;
+
+ result = avcodec_open2(ctx, enc, NULL);
+ if (result < 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't open encoder\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ *enc_ctx = ctx;
+ return 0;
+}
+
+static int init_decoder(AVCodec *dec, AVCodecContext **dec_ctx,
+ int64_t ch_layout)
+{
+ AVCodecContext *ctx;
+ int result;
+
+ ctx = avcodec_alloc_context3(dec);
+ if (!ctx)
+ {
+ av_log(NULL, AV_LOG_ERROR , "Can't allocate decoder context\n");
+ return AVERROR(ENOMEM);
+ }
+
+ ctx->request_sample_fmt = AV_SAMPLE_FMT_S16;
+ /* XXX: FLAC ignores it for some reason */
+ ctx->request_channel_layout = ch_layout;
+ ctx->channel_layout = ch_layout;
+
+ result = avcodec_open2(ctx, dec, NULL);
+ if (result < 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't open decoder\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ *dec_ctx = ctx;
+ return 0;
+}
+
+static int run_test(AVCodec *enc, AVCodec *dec, AVCodecContext *enc_ctx,
+ AVCodecContext *dec_ctx)
+{
+ AVPacket enc_pkt;
+ AVFrame *in_frame, *out_frame;
+ uint8_t *raw_in = NULL, *raw_out = NULL;
+ int in_offset = 0, out_offset = 0;
+ int frame_data_size = 0;
+ int result = 0;
+ int got_output = 0;
+ int i = 0;
+
+ in_frame = av_frame_alloc();
+ if (!in_frame)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't allocate input frame\n");
+ return AVERROR(ENOMEM);
+ }
+
+ in_frame->nb_samples = enc_ctx->frame_size;
+ in_frame->format = enc_ctx->sample_fmt;
+ in_frame->channel_layout = enc_ctx->channel_layout;
+ if (av_frame_get_buffer(in_frame, 32) != 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't allocate a buffer for input frame\n");
+ return AVERROR(ENOMEM);
+ }
+
+ out_frame = av_frame_alloc();
+ if (!out_frame)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't allocate output frame\n");
+ return AVERROR(ENOMEM);
+ }
+
+ raw_in = av_malloc(in_frame->linesize[0] * NUMBER_OF_FRAMES);
+ if (!raw_in)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't allocate memory for raw_in\n");
+ return AVERROR(ENOMEM);
+ }
+
+ raw_out = av_malloc(in_frame->linesize[0] * NUMBER_OF_FRAMES);
+ if (!raw_out)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't allocate memory for raw_out\n");
+ return AVERROR(ENOMEM);
+ }
+
+ for (i = 0; i < NUMBER_OF_FRAMES; i++)
+ {
+ av_init_packet(&enc_pkt);
+ enc_pkt.data = NULL;
+ enc_pkt.size = 0;
+
+ generate_raw_frame((uint16_t*)(in_frame->data[0]), i, enc_ctx->sample_rate,
+ enc_ctx->channels, enc_ctx->frame_size);
+ memcpy(raw_in + in_offset, in_frame->data[0], in_frame->linesize[0]);
+ in_offset += in_frame->linesize[0];
+ result = avcodec_encode_audio2(enc_ctx, &enc_pkt, in_frame, &got_output);
+ if (result < 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Error encoding audio frame\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ /* if we get an encoded packet, feed it straight to the decoder */
+ if (got_output)
+ {
+ result = avcodec_decode_audio4(dec_ctx, out_frame, &got_output, &enc_pkt);
+ if (result < 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Error decoding audio packet\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ if (got_output)
+ {
+ if (result != enc_pkt.size)
+ {
+ av_log(NULL, AV_LOG_INFO, "Decoder consumed only part of a packet, it is allowed to do so -- need to update this test\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ if (in_frame->nb_samples != out_frame->nb_samples)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different number of samples\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ if (in_frame->channel_layout != out_frame->channel_layout)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different channel layout\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ if (in_frame->format != out_frame->format)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different sample format\n");
+ return AVERROR_UNKNOWN;
+ }
+ memcpy(raw_out + out_offset, out_frame->data[0], out_frame->linesize[0]);
+ out_offset += out_frame->linesize[0];
+ }
+ }
+ av_free_packet(&enc_pkt);
+ }
+
+ if (memcmp(raw_in, raw_out, frame_data_size * NUMBER_OF_FRAMES) != 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Output differs\n");
+ return 1;
+ }
+
+ av_log(NULL, AV_LOG_INFO, "OK\n");
+
+ av_free(raw_in);
+ av_free(raw_out);
+ av_frame_free(&in_frame);
+ av_frame_free(&out_frame);
+ return 0;
+}
+
+static int close_encoder(AVCodecContext *enc_ctx)
+{
+ avcodec_close(enc_ctx);
+ av_free(enc_ctx);
+ return 0;
+}
+
+static int close_decoder(AVCodecContext *dec_ctx)
+{
+ avcodec_close(dec_ctx);
+ av_free(dec_ctx);
+ return 0;
+}
+
+int main(void)
+{
+ AVCodec *enc = NULL, *dec = NULL;
+ AVCodecContext *enc_ctx = NULL, *dec_ctx = NULL;
+ uint64_t channel_layouts[] = {AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_5POINT1_BACK, AV_CH_LAYOUT_SURROUND, AV_CH_LAYOUT_STEREO_DOWNMIX};
+ int sample_rates[] = {8000, 44100, 48000, 192000};
+ int cl, sr;
+
+ avcodec_register_all();
+
+ enc = avcodec_find_encoder(AV_CODEC_ID_FLAC);
+ if (!enc)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't find encoder\n");
+ return 1;
+ }
+
+ dec = avcodec_find_decoder(AV_CODEC_ID_FLAC);
+ if (!dec)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
+ return 1;
+ }
+
+ for (cl = 0; cl < FF_ARRAY_ELEMS(channel_layouts); cl++)
+ {
+ for (sr = 0; sr < FF_ARRAY_ELEMS(sample_rates); sr++)
+ {
+ if (init_encoder(enc, &enc_ctx, channel_layouts[cl], sample_rates[sr]) != 0)
+ return 1;
+ if (init_decoder(dec, &dec_ctx, channel_layouts[cl]) != 0)
+ return 1;
+ if (run_test(enc, dec, enc_ctx, dec_ctx) != 0)
+ return 1;
+ close_encoder(enc_ctx);
+ close_decoder(dec_ctx);
+ }
+ }
+
+ return 0;
+}
--
1.9.1
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