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use gst_caps_from_string() to create caps

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This commit is contained in:
fduncanh
2021-11-05 04:55:21 -04:00
parent 57b158478c
commit d5981c4d1e
1 changed files with 54 additions and 24 deletions
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78
renderers/audio_renderer_gstreamer.c
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@@ -22,6 +22,21 @@
#include <math.h>
#include <gst/app/gstappsrc.h>
/* GStreamer Caps strings for Airplay-defined connection types (ct) */
/* ct = 1; linear PCM (uncompressed): 44100/16/2, S16LE */
static const char lpcm[]="audio/x-raw,rate=(int)44100,channels=(int)2,format=S16LE,layout=interleaved";
/* ct = 2; codec_data is ALAC magic cookie: 44100/16/2 spf = 352 */
static const char alac[] = "audio/x-alac,mpegversion=(int)4,channnels=(int)2,rate=(int)44100,stream-format=raw,codec_data=(buffer)"
"00000024""616c6163""00000000""00000160""0010280a""0e0200ff""00000000""00000000""0000ac44";
/* ct = 4; codec_data from MPEG v4 ISO 14996-3 Section 1.6.2.1: AAC-LC 44100/2 spf = 1024 */
static const char aac_lc[] ="audio/mpeg,mpegversion=(int)4,channnels=(int)2,rate=(int)44100,stream-format=raw,codec_data=(buffer)1210";
/* ct = 8; codec_data from MPEG v4 ISO 14996-3 Section 1.6.2.1: AAC_ELD 44100/2 spf = 460 */
static const char aac_eld[] ="audio/mpeg,mpegversion=(int)4,channnels=(int)2,rate=(int)44100,stream-format=raw,codec_data=(buffer)f8e85000";
struct audio_renderer_s {
logger_t *logger;
GstElement *appsrc;
@@ -51,10 +66,25 @@ static gboolean check_plugins (void)
return ret;
}
audio_renderer_t *audio_renderer_init(logger_t *logger, video_renderer_t *video_renderer, const char* audiosink) {
audio_renderer_t *audio_renderer_init(logger_t *logger, unsigned char *compression_type, const char* audiosink) {
audio_renderer_t *renderer;
GError *error = NULL;
GstCaps *caps = NULL;
logger_log(logger, LOGGER_INFO , "audio_renderer_init: compression_type ct = %d", *compression_type);
switch (*compression_type) {
case 1:
case 2:
case 4:
case 8:
break;
default:
logger_log(logger, LOGGER_ERR, "audio_renderer_init: unsupported compression_type ct = %d", *compression_type);
return NULL;
}
renderer = calloc(1, sizeof(audio_renderer_t));
if (!renderer) {
return NULL;
@@ -63,8 +93,13 @@ audio_renderer_t *audio_renderer_init(logger_t *logger, video_renderer_t *video_
assert(check_plugins ());
GString *launch = g_string_new("appsrc name=audio_source stream-type=0 format=GST_FORMAT_TIME is-live=true ! queue ! decodebin !"
"audioconvert ! volume name=volume ! level ! ");
GString *launch = g_string_new("appsrc name=audio_source stream-type=0 format=GST_FORMAT_TIME is-live=true ! queue ! ");
if (*compression_type == 8 || *compression_type == 4) {
g_string_append(launch, "avdec_aac ! ");
} else if (*compression_type == 2) {
g_string_append(launch, "avdec_alac ! ");
}
g_string_append(launch, "audioconvert ! volume name=volume ! level ! ");
g_string_append(launch, audiosink);
g_string_append(launch, " sync=false");
renderer->pipeline = gst_parse_launch(launch->str, &error);
@@ -73,30 +108,24 @@ audio_renderer_t *audio_renderer_init(logger_t *logger, video_renderer_t *video_
renderer->appsrc = gst_bin_get_by_name (GST_BIN (renderer->pipeline), "audio_source");
renderer->volume = gst_bin_get_by_name (GST_BIN (renderer->pipeline), "volume");
gchar eld_conf[] = { 0xF8, 0xE8, 0x50, 0x00 };
GstBuffer *codec_data = gst_buffer_new_and_alloc(sizeof(eld_conf));
GstMapInfo map;
gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
memset (map.data, eld_conf[0], map.size);
memset (map.data+1, eld_conf[1], map.size);
memset (map.data+2, eld_conf[2], map.size);
memset (map.data+3, eld_conf[3], map.size);
if (*compression_type == 8) {
logger_log(logger, LOGGER_INFO, "AAC-ELD 44100/2");
caps = gst_caps_from_string(aac_eld);
} else if (*compression_type == 2) {
logger_log(logger, LOGGER_INFO, "ALAC 44100/16/2");
caps = gst_caps_from_string(alac);;
} else if (*compression_type == 4) {
logger_log(logger, LOGGER_INFO, "AAC-LC 44100/2");
caps = gst_caps_from_string(aac_lc);
logger_log(logger, LOGGER_INFO, "uncompressed PCM 44100/16/2");
} else if (*compression_type == 1) {
caps = gst_caps_from_string(lpcm);
}
GstCaps *caps = gst_caps_new_simple ("audio/mpeg",
"rate", G_TYPE_INT, 44100,
"channels", G_TYPE_INT, 2,
"mpegversion", G_TYPE_INT, 4,
"stream-format", G_TYPE_STRING, "raw",
"codec_data", GST_TYPE_BUFFER, codec_data,
NULL);
g_object_set(renderer->appsrc, "caps", caps, NULL);
gst_caps_unref(caps);
gst_buffer_unmap (codec_data, &map);
gst_buffer_unref (codec_data);
return renderer;
}
@@ -133,9 +162,10 @@ void audio_renderer_flush(audio_renderer_t *renderer) {
void audio_renderer_destroy(audio_renderer_t *renderer) {
gst_app_src_end_of_stream (GST_APP_SRC(renderer->appsrc));
gst_object_unref (renderer->appsrc);
gst_element_set_state (renderer->pipeline, GST_STATE_NULL);
gst_object_unref (renderer->pipeline);
gst_object_unref (renderer->appsrc);
gst_object_unref (renderer->volume);
if (renderer) {
free(renderer);