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Add an OpenH264 decoder wrapper

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While it is less featureful (and slower) than the built-in H264
decoder, one could potentially want to use it to take advantage
of the cisco patent license offer.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö
2016-06-24 00:58:17 +03:00
parent 785c25443b
commit 82b7525173
10 changed files with 369 additions and 46 deletions
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48
libavcodec/libopenh264enc.c
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@@ -31,6 +31,7 @@
#include "avcodec.h"
#include "internal.h"
#include "libopenh264.h"
typedef struct SVCContext {
const AVClass *av_class;
@@ -44,10 +45,6 @@ typedef struct SVCContext {
int cabac;
} SVCContext;
#define OPENH264_VER_AT_LEAST(maj, min) \
((OPENH264_MAJOR > (maj)) || \
(OPENH264_MAJOR == (maj) && OPENH264_MINOR >= (min)))
#define OFFSET(x) offsetof(SVCContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
@@ -68,31 +65,6 @@ static const AVClass class = {
"libopenh264enc", av_default_item_name, options, LIBAVUTIL_VERSION_INT
};
// Convert libopenh264 log level to equivalent libav log level.
static int libopenh264_to_libav_log_level(int libopenh264_log_level)
{
if (libopenh264_log_level >= WELS_LOG_DETAIL) return AV_LOG_TRACE;
else if (libopenh264_log_level >= WELS_LOG_DEBUG) return AV_LOG_DEBUG;
else if (libopenh264_log_level >= WELS_LOG_INFO) return AV_LOG_VERBOSE;
else if (libopenh264_log_level >= WELS_LOG_WARNING) return AV_LOG_WARNING;
else if (libopenh264_log_level >= WELS_LOG_ERROR) return AV_LOG_ERROR;
else return AV_LOG_QUIET;
}
// This function will be provided to the libopenh264 library. The function will be called
// when libopenh264 wants to log a message (error, warning, info, etc.). The signature for
// this function (defined in .../codec/api/svc/codec_api.h) is:
//
// typedef void (*WelsTraceCallback) (void* ctx, int level, const char* string);
static void libopenh264_trace_callback(void *ctx, int level, const char *msg)
{
// The message will be logged only if the requested EQUIVALENT libav log level is
// less than or equal to the current libav log level.
int equiv_libav_log_level = libopenh264_to_libav_log_level(level);
av_log(ctx, equiv_libav_log_level, "%s\n", msg);
}
static av_cold int svc_encode_close(AVCodecContext *avctx)
{
SVCContext *s = avctx->priv_data;
@@ -108,21 +80,15 @@ static av_cold int svc_encode_init(AVCodecContext *avctx)
{
SVCContext *s = avctx->priv_data;
SEncParamExt param = { 0 };
int err = AVERROR_UNKNOWN;
int err;
int log_level;
WelsTraceCallback callback_function;
AVCPBProperties *props;
// Mingw GCC < 4.7 on x86_32 uses an incorrect/buggy ABI for the WelsGetCodecVersion
// function (for functions returning larger structs), thus skip the check in those
// configurations.
#if !defined(_WIN32) || !defined(__GNUC__) || !ARCH_X86_32 || AV_GCC_VERSION_AT_LEAST(4, 7)
OpenH264Version libver = WelsGetCodecVersion();
if (memcmp(&libver, &g_stCodecVersion, sizeof(libver))) {
av_log(avctx, AV_LOG_ERROR, "Incorrect library version loaded\n");
return AVERROR(EINVAL);
}
#endif
if ((err = ff_libopenh264_check_version(avctx)) < 0)
return err;
// Use a default error for multiple error paths below
err = AVERROR_UNKNOWN;
if (WelsCreateSVCEncoder(&s->encoder)) {
av_log(avctx, AV_LOG_ERROR, "Unable to create encoder\n");
@@ -134,7 +100,7 @@ static av_cold int svc_encode_init(AVCodecContext *avctx)
(*s->encoder)->SetOption(s->encoder, ENCODER_OPTION_TRACE_LEVEL, &log_level);
// Set the logging callback function to one that uses av_log() (see implementation above).
callback_function = (WelsTraceCallback) libopenh264_trace_callback;
callback_function = (WelsTraceCallback) ff_libopenh264_trace_callback;
(*s->encoder)->SetOption(s->encoder, ENCODER_OPTION_TRACE_CALLBACK, (void *)&callback_function);
// Set the AVCodecContext as the libopenh264 callback context so that it can be passed to av_log().