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output: Add snd_output_buffer_steal() function

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-04-12 16:47:58 +02:00
parent 4870358b2f
commit 3e0140088c
2 changed files with 26 additions and 1 deletions
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1
include/output.h
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@ -65,6 +65,7 @@ int snd_output_stdio_open(snd_output_t **outputp, const char *file, const char *
int snd_output_stdio_attach(snd_output_t **outputp, FILE *fp, int _close); int snd_output_stdio_attach(snd_output_t **outputp, FILE *fp, int _close);
int snd_output_buffer_open(snd_output_t **outputp); int snd_output_buffer_open(snd_output_t **outputp);
size_t snd_output_buffer_string(snd_output_t *output, char **buf); size_t snd_output_buffer_string(snd_output_t *output, char **buf);
size_t snd_output_buffer_steal(snd_output_t *output, char **buf);
int snd_output_close(snd_output_t *output); int snd_output_close(snd_output_t *output);
int snd_output_printf(snd_output_t *output, const char *format, ...) int snd_output_printf(snd_output_t *output, const char *format, ...)
#ifndef DOC_HIDDEN #ifndef DOC_HIDDEN

26
src/output.c
View file

@ -252,6 +252,9 @@ static int snd_output_buffer_need(snd_output_t *output, size_t size)
size_t alloc; size_t alloc;
unsigned char *buf; unsigned char *buf;
/* use 'size++' to allow to add the '\0' string terminator */
/* without reallocation */
size++;
if (_free >= size) if (_free >= size)
return _free; return _free;
if (buffer->alloc == 0) if (buffer->alloc == 0)
@ -349,6 +352,28 @@ size_t snd_output_buffer_string(snd_output_t *output, char **buf)
return buffer->size; return buffer->size;
} }
/**
* \brief Returns the address of the buffer of a #SND_OUTPUT_BUFFER output handle.
* \param output The output handle.
* \param buf The functions puts the current address of the buffer at the
* address specified by \p buf.
* \return The current size of valid data in the buffer.
*
* The internal buffer is empty after this call. The caller has the responsibility
* to clean the buffer using the free() call.
*/
size_t snd_output_buffer_steal(snd_output_t *output, char **buf)
{
snd_output_buffer_t *buffer = output->private_data;
size_t size;
*buf = (char *)buffer->buf;
size = buffer->size;
buffer->buf = NULL;
buffer->alloc = 0;
buffer->size = 0;
return size;
}
/** /**
* \brief Creates a new output object with an auto-extending memory buffer. * \brief Creates a new output object with an auto-extending memory buffer.
* \param outputp The function puts the pointer to the new output object * \param outputp The function puts the pointer to the new output object
@ -377,4 +402,3 @@ int snd_output_buffer_open(snd_output_t **outputp)
*outputp = output; *outputp = output;
return 0; return 0;
} }